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considering the practical manufacture process, developing new technologies for the fabrication of perovskite solar cells (pscs) under an ambient atmosphere is highly desired. in this study, high-quality perovskite films are effectively fabricated under a relative humidity of 70% atmosphere through the substrate preheat... | highly efficient perovskite solar cells fabricated under a 70% relative humidity atmosphere |
we use data from the aeronomy of ice in the mesosphere mission and simulations using the whole atmosphere community climate model to determine the impact of the 23-30 january 2012 solar proton event (spe) on polar mesospheric clouds (pmcs) and mesospheric water vapor. we see a small heating and loss of ice mass on 26 j... | impact of the january 2012 solar proton event on polar mesospheric clouds |
films with ultraviolet (uv) and near-infrared (nir) blocking properties can be used to protect against uv and heat radiation, thus prolonging the operating life of photovoltaic devices. being wide band-gap semiconductors, zno films can absorb uv light and antimony doped tin oxide (ato) films can play the role of defend... | uv- and nir-blocking properties of zno/ato bilayer films prepared by rf magnetron sputtering |
the stratification parameters for jupiter's outer 3000 km shell are calculated using a density profile recently derived from observations of the nasa juno spacecraft currently in jovian orbit. using these parameters, the equations of classical tidal theory for a stratified, nonhydrostatic, compressible fluid are numeri... | jupiter's banding and jets may be caused by tides |
the zonal shear line (zsl) over the tibetan plateau (tp) is one of the most crucial synoptic systems inducing precipitation over the tp in boreal summer. however, few studies have comprehensively explored the thermal mechanism of the intensity evolution of the zsl. in this study, the mechanism of the atmospheric diabat... | mechanism of atmospheric diabatic heating effect on the intensity of zonal shear line over the tibetan plateau in boreal summer |
during mars dust storms, atmospheric heating and expansion moves the ionospheric peak upward. typically, peak altitude increases by no more than 10 km, and this increase occurs simultaneously with the expansion of the dust storm. however, felici et al. (2020), https://doi.org/10.1029/2019ja027083, using the mars atmosp... | atypically intense and delayed response of the martian ionosphere to the regional dust storm of 2016: a study using maven observations and models |
in the course of analysing the annual air temperature in wrocław (twr), a rapid change of the thermal regime was found between 1987 and 1989. twr increased by >1°c, a strong, statistically significant positive trend emerged. the analysis of processes showed that strong warming in the cold season of the year (decembe... | role of internal variability of climate system in increase of air temperature in wrocław (poland) in the years 1951-2018 |
neither solar collectors nor nocturnal radiative cooling units could work all day. a novel combined diurnal solar heating and nocturnal radiative cooling (sh-rc) collector was proposed and investigated in this study. the collector can obtain heat at daytime and gather cooling energy at nighttime, therefore offering mul... | numerical study and experimental validation of a combined diurnal solar heating and nocturnal radiative cooling collector |
since 1850, the rise in global mean surface temperatures (gmsts) from increasing atmospheric concentrations of greenhouse gases (ghgs) has exhibited three ~30-year hiatus (surface cooling) episodes. the current hiatus is often thought to be generated by similar cooling episodes in pacific or atlantic ocean basins. howe... | a proposed exogenous cause of the global temperature hiatus |
four years of lidar observations at mcmurdo reveal that the fast amplitude growth with altitude of diurnal temperature tides from 100 to 110 km during antarctic winters, exceeding that of the freely propagating tides from the lower atmosphere, increases in strength with the kp magnetic activity index. simulations with ... | lidar and ctipe model studies of the fast amplitude growth with altitude of the diurnal temperature "tides" in the antarctic winter lower thermosphere and dependence on geomagnetic activity |
the current climate changes imply the rise of the mean temperature of the cities during hot periods. to help the public policy to be more efficient about urban heat island (uhi) reduction we aim to define a uhi risk indicator. to be useful at a local scale, the resolution of this index must be at the scale of the build... | urban heat island index based on a simplified micro scale model |
summer cyanobacteria blooms regularly occur in the baltic sea. the phenology of the bloom, however, is mostly unknown. data of total biomass of the bloom-forming species nodularia spumigena, aphanizomenon sp. and dolichospermum spp., water column variables, nutrients and weather conditions were used to study and define... | environmental window of cyanobacteria bloom occurrence |
the kepler and tess missions revealed a remarkable abundance of sub-neptune exoplanets. despite this abundance, our understanding of the nature and compositional diversity of sub-neptunes remains limited, to a large part because atmospheric studies via transmission spectroscopy almost exclusively have aimed for low-den... | is the hot, dense sub-neptune toi-824 b an exposed neptune mantle? spitzer detection of the hot dayside and reanalysis of the interior composition |
drought persistence in west african sahel has often been explained as an effect of positive vegetation-atmosphere feedback associated with surface albedo or the partitioning of solar radiation into sensible and latent heat fluxes. an often overlooked aspect of land-atmosphere coupling results from vegetation controls o... | dust-rainfall feedback in west african sahel |
jupiter's thermosphere is ∼700 k hotter than expected if it were heated only by solar extreme ultraviolet radiation. other, more effective heat sources are therefore necessary to explain the high observed temperatures ≥900 k. it has been suggested that heating resulting from the atmospheric interaction with jupiter's d... | an initial study into the long-term influence of solar wind dynamic pressure on jupiter's thermosphere |
we perform and analyze global particle-in-cell (pic) simulations of the interaction between solar wind and an outgassing comet with the goal of studying the plasma kinetic dynamics of a cometary environment. to achieve this, we design and implement a new numerical method in the ipic3d code to model outgassing from the ... | particle-in-cell simulations of plasma dynamics in cometary environment |
we have measured auroral zone thermospheric neutral winds in the midnight local time sector, using ground-based optical doppler spectroscopy of the 630.0 nm emission from atomic oxygen, originating at around 240 km altitude over alaska. one of the most prominent features seen in winds at these latitudes is the cross-po... | characterizing unexpectedly localized slowing of the thermospheric cross-polar jet of neutral wind over alaska in the midnight sector |
this research examined whether tropospheric sulfate ion aerosols (so42-) might be applied at a regional scale to mitigate meteorological phenomena with extremely high daily temperatures. the specific objectives of this work were: 1) to model the behaviour of so42-aerosols in the troposphere and their influence on surfa... | application of tropospheric sulfate aerosol emissions to mitigate meteorological phenomena with extremely high daily temperatures |
the atmospheres of exoplanets reveal all their properties beyond mass, radius, and orbit. based on bulk densities, we know that exoplanets larger than 1.5 earth radii must have gaseous envelopes, hence atmospheres. we discuss contemporary techniques for characterization of exoplanetary atmospheres. the measurements are... | illusion and reality in the atmospheres of exoplanets |
context. the impulsive phase of solar flares is a time of rapid energy deposition and heating in the lower solar atmosphere, leading to changes in the temperature and density structure of the region.aims: we use an o v density diagnostic formed from the λ192 /λ248 line ratio, provided by the hinode/eis instrument, to d... | determining energy balance in the flaring chromosphere from oxygen v line ratios |
to seek an atmospheric heating mechanism operating on the sun we investigated a heating source generated by a downflow, both of which may arise in a magnetic loop dynamically formed on the sun via flux emergence. since an observation shows that the illumination of evolving magnetic loops under the dynamic formation occ... | dynamic formation and associated heating of a magnetic loop on the sun |
context. the intensity of radiation from the solar atmosphere at millimetre wavelengths is closely related to the plasma temperature, and the formation height of the radiation is wavelength dependent. it follows from this that the slope of the intensity continuum, or the brightness temperature continuum, samples the lo... | using the slope of the brightness temperature continuum as a diagnostic tool for solar alma observations |
gaseous atmosphere during graphitic carbon nitride (g-c3n4) preparation can have a significant influence on modifying the morphological texture, polymeric structure, charge carrier behavior, and consequently the photocatalytic performance. herein, we developed a new one-step method to fabricate g-c3n4 through direct py... | unprecedented effect of co2 calcination atmosphere on photocatalytic h2 production activity from water using g-c3n4 synthesized from triazole polymerization |
in winter, the reflective properties of ice-and-snow-covered lakes and the surrounding surface covered with snow differ little. estimation of the albedo becomes especially important in spring when the reflectivity of the ice-covered lakes differs markedly from the surrounding snow-free surface. the measurements of the ... | albedo of a small ice-covered boreal lake: daily, meso-scale and interannual variability on the background of regional climate |
variations of energy fluxes with enso, iod, and intra-seasonal variability of indian summer monsoon rainfall (ismr) over the indian monsoon region are examined using ecmwf era interim reanalysis over a period of 1979-2013. the composite anomalies of radiative fluxes, viz. shortwave and longwave, latent, and sensible he... | variations of energy fluxes with enso, iod and isv of indian summer monsoon rainfall over the indian monsoon region |
this study aims to explore the robustness of the mixed-layer heat budget as estimated from an eddy-permitting model with respect to uncertainties in atmospheric forcing. we illustrate how statistics from an ensemble can be used in a first step towards the calculation of error bars of any simulated quantity, such as the... | estimating uncertainties on a gulf stream mixed-layer heat budget from stochastic modeling |
coarse-grained igneous calcium-aluminum-rich inclusions (cais) are suggested to have experienced gas-melt isotope exchange of oxygen during the melting events of their precursors. therefore, their oxygen isotope variation would preserve information about the high-temperature processes in the earliest solar system. we e... | oxygen isotope exchange kinetics between cai melt and carbon monoxide gas: implication for cai formation in the earliest solar system |
the solar updraft power plant technology addresses a very challenging idea of combining two kinds of renewable energy: wind and solar. the working principle is simple: a solar updraft power plant (supp) consists of a collector area to heat the air due to the wide-banded ultra-violet solar radiation, the high-rise solar... | facing technological challenges of solar updraft power plants |
low coastal stratiform clouds (stratus, stratocumulus, and fog), referred to here as coastal low cloudiness (clc), are a persistent seasonal feature of continental west coasts, including california. the importance of clc ranges across fields, with applications ranging from solar resource forecasting, growth of endemic ... | california coastal low clouds: variability and influences across climate to weather and continental to local scales |
diffusion of helium has been characterized in silicon carbide of cubic and hexagonal (4h and 6h) forms. polished sections of sic were implanted with 3he at 100 kev at a dose of 1 × 1015/cm2. the implanted sic samples were sealed under vacuum in silica glass ampoules, and annealed in 1-atm furnaces. 3he distributions fo... | diffusion of helium in sic and implications for retention of cosmogenic he |
the physical properties of the wais divide deep ice core record meteorological conditions during and shortly after deposition, mean temperature during transformation to ice, deformation within the ice, and may retain information on past surface elevations. the wais divide (wdc06a) core was recovered from west antarctic... | physical properties of the west antarctic ice sheet (wais) divide deep core: development, evolution, and interpretation |
this paper presents the experimental performance of a curved nozzle two-phase reaction turbine design for trilateral flash cycle heat engine. results from two tests have been presented, for first test the average feed water temperature was maintained around 97 °c under local atmospheric pressure, while for the second t... | experimental performance of a rotating two-phase reaction turbine |
climatic conditions and the solar and circulation features in the lake baikal basin are analyzed. the relationship between the heat balance and surface temperature of slopes is shown, taking into account each features' physical state. the dependence of the heat balance values and the underlying surface temperature were... | atmospheric processes in the south baikal basin and their role in relief formation |
in situ characterization of micro- and nanoscale defects in polycrystalline thin-film materials is required to elucidate the physics governing defect formation and evolution during photovoltaic device fabrication and operation. x-ray fluorescence spectromicroscopy is particularly well-suited to study defects in compoun... | development of an in situ temperature stage for synchrotron x-ray spectromicroscopy |
supra-arcade downflows (sads) are dark structures descending towards post-reconnection flare loops observed in extreme ultraviolet or x-ray observations and are closely related to magnetic reconnection during solar flares. due to the lack of statistical study on sads in a single flare, evolutions of kinematic and therm... | statistical investigation of the kinematic and thermal properties of supra-arcade downflows observed during a solar flare |
nocturnal evolution of radon concentration and the height of a box model, which is determined from radon concentration and local radon flux at the ground, are used as indicators of nocturnal atmospheric stability in single-height observations. however, quantitative relationships between these indicators and meteorologi... | radon as an indicator of nocturnal atmospheric stability: a simplified theoretical approach |
the nature of turbulence, dissipation, and heating in plasma media has been an attractive and challenge problem in space physics as well as in basic plasma physics. a wide continuous spectrum of alfvénic turbulence from large mhd-scale alfvén waves (aws) in the inertial turbulence regime to small kinetic-scale kinetic ... | nature of turbulence, dissipation, and heating in space plasmas: from alfvén waves to kinetic alfvén waves |
global energy needs continue to grow steadily with increasing population and standard of living. while fossil fuels have been a major source of our energy, they are no longer favorable due to their greenhouse gas emissions and atmospheric pollution; the development of carbon-free sources of energy is crucial. solar ene... | corrosion in molten salts for solar thermal power |
there are currently significant disagreements in the strength of the water vapour continuum in the near-infrared region. to understand the effects of these disagreements on the absorption of solar radiation, line-by-line radiative transfer calculations were performed from 2000 to 10,000 cm−1 (1-5 μm) for three standard... | the effect of the differences in near-infrared water vapour continuum models on the absorption of solar radiation |
in this paper, we developed algorithms to estimate hourly evapotranspiration (et) during a day under clear and cloud cover conditions using data from the chinese fengyun-2d (fy-2d) geostationary meteorological satellite over the yellow river source area. for cloud-free conditions, the surface energy balance system (seb... | evapotranspiration estimated by using datasets from the chinese fengyun-2d geostationary meteorological satellite over the yellow river source area |
known as the heat-mitigation effect, irrigated rice-paddy fields distribute a large fraction of their received energy to the latent heat during the growing season. the present hypothesis is that increased atmospheric co2 concentration decreases the stomatal conductance of rice plants and increases the air temperature b... | heat-mitigation effects of irrigated rice-paddy fields under changing atmospheric carbon dioxide based on a coupled atmosphere and crop energy-balance model |
soil atmospheric interactions play an important role within the thermal energy balance and seasonal temperature variations of the ground. this paper presents a formulation for the surface boundary conditions related to interactions between soil and atmosphere. the boundary condition formulated considers heat flow at th... | energy balance at the soil atmospheric interface |
anthropogenic sources have a significant impact on air quality in urbanized areas and can contribute to large variability of atmospheric particle sizes, its matrix composition and potential for toxicological effects on environment and public health. this paper presents data from one-year measurements of total carbon (t... | total carbon and benzo(a)pyrene in particulate matter over a polish urban site - a combined effect of major anthropogenic sources and air mass transport |
carbon dioxide (co2) infrared emissions at 15 μm is the primary radiative cooling mechanism of the thermosphere in the altitude range of 100-135 km. this paper explores the role of two important diurnal nonmigrating tides, the de2 and de3, in the modulation of co2 15 μm emissions during the solar minimum year 2008 by (... | nonmigrating tidal impact on the co2 15 μm infrared cooling of the lower thermosphere during solar minimum conditions |
metal-oxide based, two-step thermochemical cycling is a promising means of harvesting solar energy, in which water or carbon dioxide is dissociated to synthesize fuels via successive reduction and oxidation half-reactions driven by concentrated solar heat. isothermal thermochemical cycling has recently emerged as an im... | isothermal versus two-temperature solar thermochemical fuel synthesis: a comparative study |
the esa euclid mission aims to understand why the expansion of the universe is accelerating and pin down the source responsible for the acceleration. it will uncover the very nature of dark energy and gravitation by measuring with exquisite accuracy the expansion rate of the universe and the growth rate of structure fo... | euclid and the dark universe |
we study effects on the luminosity distance of a local inhomogeneity seeded by primordial curvature perturbations of the type predicted by the inflationary scenario and constrained by the cosmic microwave background radiation. we find that a local underdensity originated from a one, two or three standard deviations pea... | nonpertubative effects of primordial curvature perturbations on cosmological observables |
unlike light, gravitational waves effectively propagate freely at all times. this will allow gravitational wave detectors like lisa to open a new, deeper window into the early universe. cosmic inflation and other primordial dynamics could source a stochastic background of gravitational waves (sgwb) in the lisa band. in... | signatures of multi-field inflation in lisa |
we humans have repeatedly underestimated not only the size of our cosmos, but also the power of our humans minds to understand it using mathematical equations. i focus on the status of cosmological inflation and its predictions in light of the latest results from the bicep2 and planck. i also highlight mysteries such a... | inflation and parallel universes: science or fiction? |
cosmic inflation is commonly assumed to be driven by quantum fields. quantum mechanics predicts phenomena such as quantum fluctuations and tunneling of the field. here, we show an example of a quantum interference effect which goes beyond the semiclassical treatment and which may be of relevance in the early universe. ... | bloch oscillations in the early universe |
primordial gravitational waves constitute a promising probe of the very early universe physics and the laws of gravity. we study the changes to tensor-mode perturbations that can arise in various modified gravity theories. these include a modified friction and a nonstandard dispersion relation. we introduce a physicall... | testing gravity theories using tensor perturbations |
we propose an experiment which would leverage cosmology to test quantum mechanics using astronomical observations. our experiment would send entangled photons to detectors over 100 kilometers apart, whose settings would be rapidly chosen using real-time telescopic observations of distant, causally disconnected, cosmic ... | testing quantum mechanics and bell's inequality with astronomical observations |
there is a deep interconnection between the physics of flow anisotropies in relativistic heavy-ion collision experiments (rhice) and the anisotropies observed in cosmic microwave background radiation (cmbr). this is due to the presence of superhorizon fluctuations in both cases which, for cmbr case, have origin in the ... | cmbr power spectrum and flow fluctuations in relativistic heavy-ion collisions |
the theory of cosmic inflation with the plateau-like potentials for the scalar field is very successful in predicting standard cosmological parameters. however, if the quantum effects are included, the theory inherently contains serious problems, namely, the multiverse problem and the initial conditions problem. it has... | exploring proposals for resolving the initial conditions and multiverse problems in inflation |
we highlight the role of weak lensing measurements from current and upcoming stage-iv imaging surveys in the search for cosmic inflation, specifically in measuring the scalar spectral index $n_s$. to do so, we combine the dark energy survey 3 years of observation weak lensing and clustering data with bicep/keck, planck... | results and forecasts on cosmic inflation from weak lensing |
we estimate the efficiency of mitigating the lensing $b$-mode polarization, the so-called delensing, for the $litebird$ experiment with multiple external data sets of lensing-mass tracers. the current best bound on the tensor-to-scalar ratio, $r$, is limited by lensing rather than galactic foregrounds. delensing will b... | litebird science goals and forecasts: improving sensitivity to inflationary gravitational waves with multitracer delensing |
assuming that the first creatures of creation create a network, it is shown that how the network can be mapped to a topos discrete quantum manifold which is equipped with both the discrete calculus and the alexandrov's algebra. we assign a locale to each nodes of the space-time network and show that in general, invaria... | topos many-node theory: roots, foundations and predictions |
in this talk, i'll summarize the current status and future perspectives on the measurement of primordial non-gaussianity within the dark energy survey collaboration. primordial non-gaussianity (png) is a promising observable of the underlying physics of cosmic inflation, characterized by a parameter denoted by fnl. i'l... | primordial non-gaussianity measurement with des |
this paper introduces novel solutions for inflation and late-time cosmic acceleration within the framework of quantum lovelock gravity, utilizing friedmann equations. furthermore, we demonstrate the hypergeometric states of cosmic acceleration through the schrödinger stationary equation. a physical interpretation is pr... | cosmic acceleration in lovelock quantum gravity |
the jwst discovery of a number of super-early (redshift z > 10) blue galaxies requires these systems to be essentially dust free in spite of their large stellar masses. a possible explanation is that dust is evacuated by radiatively driven outflows. we test this hypothesis by deriving the eddington ratio λe= l bol/l... | dusty-wind-clear jwst super-early galaxies |
we examine the properties of the circumgalactic medium (cgm) at low redshift in a range of simulated milky way mass halos. the sample is comprised of seven idealized simulations, an adaptive mesh refinement cosmological zoom-in simulation, and two groups of 50 halos with star-forming or quiescent galaxies taken from th... | first results from smaug: uncovering the origin of the multiphase circumgalactic medium with a comparative analysis of idealized and cosmological simulations |
ultraluminous x-ray sources (ulxs) have such high x-ray luminosities that they were long thought to be accreting intermediate-mass black holes. yet, some ulxs have been shown to display periodic modulations and coherent pulsations suggestive of a neutron star in orbit around a stellar companion and accreting at super-e... | wind roche lobe overflow in high-mass x-ray binaries. a possible mass-transfer mechanism for ultraluminous x-ray sources |
the dynamics of eyewall contraction of tropical cyclones (tcs) has been revisited in this study based on both three-dimensional and axisymmetric simulations and dynamical diagnostics. because eyewall contraction is closely related to the contraction of the radius of maximum wind (rmw), its dynamics is thus often studie... | revisiting the dynamics of eyewall contraction of tropical cyclones |
we investigate the evolution of stellar population gradients from z = 2 to 0 in massive galaxies at large radii (r > 2reff) using 10 cosmological zoom simulations of haloes with 6 × 1012 m⊙ < mhalo < 2 × 1013 m⊙. the simulations follow metal cooling and enrichment from snii, snia and asymptotic giant branch wi... | the stellar accretion origin of stellar population gradients in massive galaxies at large radii |
recent work on jets and disk winds in low-mass x-ray binaries (lmxbs) suggests that they are to a large extent mutually exclusive, with jets observed in spectrally hard states and disk winds observed in spectrally soft states. in this paper we use existing literature on jets and disk winds in the luminous neutron star ... | evidence for simultaneous jets and disk winds in luminous low-mass x-ray binaries |
to understand the nature of the brightest γ -ray binary system ls 5039, hard x-ray data of the object, taken with the suzaku and nustar observatories in 2007 and 2016, respectively, were analyzed. the two data sets jointly gave tentative evidence for a hard x-ray periodicity, with a period of ∼9 s and a period increase... | sign of hard-x-ray pulsation from the γ -ray binary system ls 5039 |
ultraluminous x-ray sources (ulxs) are non-nuclear point sources exceeding the eddington luminosity of a 10 m⊙ black hole. modern consensus for a majority of the ulx population is that they are powered by stellar-mass black holes or neutron stars accreting well above the eddington limit. theoretical models of super-edd... | searching for outflows in ultraluminous x-ray sources through high-resolution x-ray spectroscopy |
we present the warpfield emission predictor, warpfield-emp, which couples the 1d stellar feedback code warpfield with the cloudy h iiregion/pdr code and the polaris radiative transfer code, in order to make detailed predictions for the time-dependent line and continuum emission arising from the h ii region and pdr surr... | warpfield-emp: the self-consistent prediction of emission lines from evolving h ii regions in dense molecular clouds |
we explore the implications of the light curve of the early tev gamma-ray afterglow of grb221009a reported by the lhaaso collaboration. we show that the reported offset of the reference time, $t_*$, allows the determination of the relativistic jet activation time, which occurs approximately $200\,\mathrm{s}$ after the ... | naked forward shock seen in the tev afterglow data of grb221009a |
supernova (sn) feedback plays a crucial role in simulations of galaxy formation. because blast waves from individual sne occur on scales that remain unresolved in modern cosmological simulations, sn feedback must be implemented as a subgrid model. differences in the manner in which sn energy is coupled to the local int... | the importance of the way in which supernova energy is distributed around young stellar populations in simulations of galaxies |
the circumgalactic medium (cgm) contains information on gas flows around galaxies, such as accretion and supernova-driven winds, which are difficult to constrain from observations alone. here, we use the high-resolution tng50 cosmological magnetohydrodynamical simulation to study the properties and kinematics of the cg... | a comparison of circumgalactic mg ii absorption between the tng50 simulation and the megaflow survey |
we present an analysis of the angular momentum content of the circumgalactic medium (cgm) using tng100, one of the flagship runs of the illustristng project. we focus on milky way-mass halos (∼1012 m⊙) at z = 0 but also analyze other masses and redshifts up to z = 5. we find that the cgm angular momentum properties are... | the angular momentum of the circumgalactic medium in the tng100 simulation |
we present a sample of 17 objects from the califa survey where we find initial evidence of galactic winds based on their off-axis ionization properties. we identify the presence of outflows using various optical diagnostic diagrams [e.g. ew(h α), [n ii]/h α, [s ii]/h α, [o i]/h α line-ratio maps]. we find that all 17 c... | systematic study of outflows in the local universe using califa: i. sample selection and main properties |
conventional and along-track interferometric (ati) synthetic aperture radar (sar) senses the motion of the ocean surface by measuring the doppler shift of reflected signals. measurements are affected by a wind-wave-induced artifact surface velocity (wasv) which was modeled theoretically in past studies and has been est... | wind-wave-induced velocity in ati sar ocean surface currents: first experimental evidence from an airborne campaign |
we present a comprehensive study of the na i λ5890, 5895 (na i d) resonant lines in the sloan digital sky survey (sdss, dr7) spectroscopic sample to look for neutral gas outflows in the local galaxies. individual galaxy spectra are stacked in bins of stellar mass (m⋆) and star formation rate (sfr) to investigate the de... | two-face(s): ionized and neutral gas winds in the local universe |
the central supermassive black hole of the milky way, sgr a*, accretes at a very low rate making it a very underluminous galactic nucleus. despite the tens of wolf-rayet stars present within the inner parsec supplying ∼10-3 m ⊙ yr-1 in stellar winds, only a negligible fraction of this material (<10-4) ends up being ... | stellar winds pump the heart of the milky way |
outflows form an integral component in regulating the gas cycling in and out of galaxies, although their impact on the galaxy hosts is still poorly understood. here we present an analysis of 405 high mass (log m*/m⊙ ≥ 10), star-forming galaxies (excluding agn) with low inclinations at z ∼ 0, using stacking techniques o... | outflows in star-forming galaxies: stacking analyses of resolved winds and the relation to their hosts' properties |
a curious rotation period distribution in the colour-magnitude-period diagram (cmpd) of the kepler field was recently revealed, thanks to data from gaia and kepler spacecraft. it was found that redder and brighter stars are spinning slower than the rest of the main sequence. on the theoretical side, it was demonstrated... | evidence for metallicity-dependent spin evolution in the kepler field |
superwinds and superbubbles driven by mechanical feedback from super star clusters (sscs) are common features in many star-forming galaxies. while the adiabatic fluid model can well describe the dynamics of superwinds, several observations of starburst galaxies revealed the presence of compact regions with suppressed s... | catastrophic cooling in superwinds. ii. exploring the parameter space |
context. observing the spatial distribution and excitation processes of atomic and molecular gas in the inner regions (<20 au) of young (<10 myr) protoplanetary disks helps us to understand the conditions for the formation and evolution of planetary systems.aims: in the framework of the penellope and ullyses proj... | penellope. iv. a comparison between optical forbidden lines and h2 uv lines in the orion ob1b and σ-ori associations |
we study high-energy γ-rays observed from cyg x-3 by the fermi large area telescope and the 15-ghz emission observed by the ryle telescope and the arcminute microkelvin imager. we measure the γ-ray spectrum averaged over strong flares much more accurately than before and find it well modelled by compton scattering of s... | a comprehensive study of high-energy gamma-ray and radio emission from cyg x-3 |
we study stellar-halo formation using six milky-way-mass galaxies in fire-2 cosmological zoom simulations. we find that $5{-}40{{\ \rm per\ cent}}$ of the outer (50-300 kpc) stellar halo in each system consists of in-situ stars that were born in outflows from the main galaxy. outflow stars originate from gas accelerate... | stars made in outflows may populate the stellar halo of the milky way |
we present an evolutionary sequence of models of the photoionized disk-wind outflow around forming massive stars based on the core accretion model. the outflow is expected to be the first structure to be ionized by the protostar and can confine the expansion of the h ii region, especially in lateral directions in the p... | outflow-confined hii regions. i. first signposts of massive star formation |
photoevaporation of protoplanetary discs by high-energy radiation from the central young stellar object is currently the favourite model to explain the sudden dispersal of discs from the inside out. while several theoretical works have provided a detailed pictured of this process, the direct observational validation is... | blueshifted [o i] lines from protoplanetary discs: the smoking gun of x-ray photoevaporation |
based on the no-outflow assumption, we investigate steady-state, axisymmetric, optically thin accretion flows in spherical coordinates. by comparing the vertically integrated advective cooling rate with the viscous heating rate, we find that the former is generally less than 30% of the latter, which indicates that the ... | mechanism of outflows in accretion system: advective cooling cannot balance viscous heating? |
we explore when supernovae can (and cannot) regulate the star formation and bulge growth in galaxies based on a sample of 18 simulated galaxies. the simulations are the first to model feedback superbubbles including evaporation and conduction. these processes determine the mass loadings and wind speeds of galactic outf... | cosmological galaxy evolution with superbubble feedback - ii. the limits of supernovae |
galaxy formation and evolution are regulated by the feedback from galactic winds. absorption lines provide the most widely available probe of winds. however, since most data only provide information integrated along the line of sight, they do not directly constrain the radial structure of the outflows. in this paper, w... | classy. vi. the density, structure, and size of absorption-line outflows in starburst galaxies |
successful models of the low-redshift circumgalactic medium (cgm) must account for (1) a large amount of gas, (2) relatively slow gas velocities, (3) a high degree of metal enrichment, (4) the similar absorption properties around both star-forming and passive galaxies, and (5) the observationally inferred temperature a... | fast winds drive slow shells: a model for the circumgalactic medium as galactic wind-driven bubbles |
magnetohydrodynamic (mhd) and photoevaporative winds are thought to play an important role in the evolution and dispersal of planet-forming disks. here, we analyze high-resolution (δv ~ 7 km s-1) optical spectra from a sample of 115 t tauri stars in the ~5-10 myr upper sco association and focus on the [o i] λ6300 and h... | a high-resolution optical survey of upper sco: evidence for coevolution of accretion and disk winds |
protoplanetary disks dissipate rapidly after the central star forms, on time-scales comparable to those inferred for planet formation. in order to allow the formation of planets, disks must survive the dispersive effects of uv and x-ray photoevaporation for at least a few myr. viscous accretion depletes significant amo... | disk dispersal: theoretical understanding and observational constraints |
to understand the role that active galactic nuclei (agn) feedback plays in galaxy evolution, we need in-depth studies of the multi-phase structure and energetics of galaxy-wide outflows. in this work, we present new, deep (∼50 h) noema co(1-0) line observations of the molecular gas in the powerful outflow driven by the... | agn feedback in a galaxy merger: multi-phase, galaxy-scale outflows with a fast molecular gas blob ∼6 kpc away from iras f08572+3915 |
previous works show that strong winds exist in hot accretion flows around black holes. those works focus only on the region close to the black hole, so it is unknown whether or where the wind production stops at large radii. in this paper, we investigate this problem with hydrodynamical simulations. we take into accoun... | hydrodynamical numerical simulation of wind production from black hole hot accretion flows at very large radii |
in a novel approach employing implicit likelihood inference (ili), also known as likelihood-free inference, we calibrate the parameters of cosmological hydrodynamic simulations against observations, which has previously been unfeasible due to the high computational cost of these simulations. for computational efficienc... | calibrating cosmological simulations with implicit likelihood inference using galaxy growth observables |
we present the follow-up campaign of the luminous red nova (lrn) at 2019zhd, the third event of this class observed in m 31. the object was followed by several sky surveys for about five months before the outburst, during which it showed a slow luminosity rise. in this phase, the absolute magnitude ranged from mr = -2.... | forbidden hugs in pandemic times. i. luminous red nova at 2019zhd, a new merger in m 31 |
the properties of carbon stars in the magellanic clouds (mcs) and their total dust production rates are predicted by fitting their spectral energy distributions (sed) over pre-computed grids of spectra reprocessed by dust. the grids are calculated as a function of the stellar parameters by consistently following the gr... | the mass-loss, expansion velocities, and dust production rates of carbon stars in the magellanic clouds |
understanding the origin of accretion and dispersal of protoplanetary disks is fundamental for investigating planet formation. recent numerical simulations show that launching winds are unavoidable when disks undergo magnetically driven accretion and/or are exposed to external uv radiation. observations also hint that ... | determining dispersal mechanisms of protoplanetary disks using accretion and wind mass loss rates |
it is still unclear whether the evolution of protoplanetary disks, a key ingredient in the theory of planet formation, is driven by viscous turbulence or magnetic disk winds. as viscously evolving disks expand outward over time, the evolution of disk sizes is a discriminant test for studying disk evolution. however, it... | effect of mhd wind-driven disk evolution on the observed sizes of protoplanetary disks |
context. feedback from active galactic nuclei (agns) in general seems to play an important role in the evolution of galaxies, although the impact of agn winds on their host galaxies is still unknown in the absence of a detailed analysis.aims: we aim to analyse the kinematics of a sample of 170 agn host galaxies as comp... | ionised gas kinematics in manga agn. extents of the narrow-line and kinematically disturbed regions |
the variations of the metallicity and ionization parameter in h ii regions are usually thought to be the dominant factors that produce the variations we see in the observed emission line spectra. there is an increasing amount of evidence that these two quantities are physically correlated, although the exact form of th... | correlation between the gas-phase metallicity and ionization parameter in extragalactic h ii regions |
context. analytical models of chemical evolution, including inflow and outflow of gas, are important tools for studying how the metal content in galaxies evolves as a function of time.aims: we present new analytical solutions for the evolution of the gas mass, total mass, and metallicity of a galactic system when a dec... | new analytical solutions for chemical evolution models: characterizing the population of star-forming and passive galaxies |
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