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one of the most unique phenomena in the galactic center region is the existence of numerous long and narrow filamentary structures within a few hundred parsecs of sgr a⋆. while more than 100 radio filaments have been revealed by meerkat, only about two dozen x-ray filaments have been discovered so far. in this article,... | nustar and chandra observations of the galactic center nonthermal x-ray filament g0.13-0.11: a pulsar-wind-nebula-driven magnetic filament |
this paper aims to provide new insights on the origin of the tev source ver j1907+062 through new high-quality radio observations. we used the karl g. jansky very large array (vla) to observe the whole extension of ver j1907+062 at 1.5 ghz with a mosaicking technique and the psr j1907+0602 in a single pointing at 6 ghz... | radio study of the extended tev source ver j1907+062 |
we calculate the effective temperature (teff) of ionizing star(s), the oxygen abundance of the gas phase (o/h), and the ionization parameter u for a sample of h ii regions located in the discs of 59 spiral galaxies in the redshift range 0.005 < z < 0.03. we use spectroscopic data taken from the califa data releas... | effective temperature of ionizing stars in extragalactic h ii regions - ii. nebular parameter relationships based on califa data |
we obtained six observations of psr j1741-2054 using the chandra acis-s detector totaling ∼300 ks. by registering this new epoch of observations to an archival observation taken 3.2 yr earlier using x-ray point sources in the field of view, we have measured the pulsar proper motion at μ =109+/- 10 mas y{{r}-1} in a dir... | x-ray analysis of the proper motion and pulsar wind nebula for psr j1741-2054 |
due to its youth, proximity and richness, the orion nebula cloud (onc) is an ideal testbed to obtain a comprehensive view on the initial mass function (imf) down to the planetary mass regime. using the hawk-i camera at the vlt, we have obtained an unprecedented deep and wide near-infrared jhk mosaic of the onc (90 per ... | the bimodal initial mass function in the orion nebula cloud |
we use integral field spectroscopic (ifs) observations from the gemini multi-object spectrograph north (gmos-n) to study the central h ii region in a nearby blue compact dwarf (bcd) galaxy ngc 4449. the ifs data enable us to explore the variation of physical and chemical conditions of the star-forming region and the su... | a gmos-n ifu study of the central h ii region in the blue compact dwarf galaxy ngc 4449: kinematics, nebular metallicity and star formation |
stellar bow shocks are observed in a variety of interstellar environments and shaped by the conditions of gas in the interstellar medium (ism). in situ measurements of turbulent density fluctuations near stellar bow shocks are only achievable with a few observational probes, including hα-emitting bow shocks and the voy... | an in situ study of turbulence near stellar bow shocks |
we use the measured fluxes of polycyclic aromatic hydrocarbon (pah) emission features at 6.2, 7.7, 8.6, 11.0, and 11.2 μm in the reflection nebula ngc 2023 to carry out a principal component analysis (pca) as a means to study previously reported variations in the pah emission. we find that almost all of the variations ... | a principal component analysis of polycyclic aromatic hydrocarbon emission in ngc 2023 |
we have performed very large and high-resolution cosmological hydrodynamic simulations in order to investigate detectability of nebular lines in the rest-frame ultraviolet (uv) to optical wavelength range from galaxies at z > 7. we find that the expected line fluxes are very well correlated with the apparent uv magn... | nebular line emission from z > 7 galaxies in a cosmological simulation: rest-frame uv to optical lines |
we present follow-up radio observations of eso 243-49 hlx-1 from 2012 using the australia telescope compact array (atca) and the karl g. jansky very large array (vla). we report the detection of radio emission at the location of hlx-1 during its hard x-ray state using the atca. assuming that the `fundamental plane' of ... | on the radio properties of the intermediate-mass black hole candidate eso 243-49 hlx-1 |
polarimetric observations of celestial sources in the hard x-ray band stand to provide new information on emission mechanisms and source geometries. pogo+ is a compton scattering polarimeter (20-150 kev) optimised for the observation of the crab (pulsar and wind nebula) and cygnus x-1 (black hole binary), from a strato... | calibration and performance studies of the balloon-borne hard x-ray polarimeter pogo+ |
the w50/ss433 system is an unusual galactic outflow-driven object of debatable origin. we have used the australia telescope compact array to observe a new 198 pointing mosaic, covering 3° × 2°, and present the highest-sensitivity full-stokes data of w50 to date using wide-field, wide-band imaging over a 2 ghz bandwidth... | interacting large-scale magnetic fields and ionized gas in the w50/ss433 system |
we report on the discovery and timing observations of 29 distant long-period pulsars found in the ongoing arecibo l-band feed array pulsar survey. following discovery with the arecibo telescope, confirmation and timing observations of these pulsars over several years at jodrell bank observatory have yielded high-precis... | timing of 29 pulsars discovered in the palfa survey |
we present a spectral analysis of cool and cooling gas in 45 cool-core clusters and groups of galaxies obtained from reflection grating spectrometer (rgs) xmm-newton observations. the high-resolution spectra show fe xvii emission in many clusters, which implies the existence of cooling flows. the cooling rates are meas... | searching for cool and cooling x-ray emitting gas in 45 galaxy clusters and groups |
the distribution of ejecta in young supernova remnants offers a powerful observational probe of their explosions and progenitors. here we present a 3d reconstruction of the ejecta in snr 0540-69.3, which is an o-rich remnant with a pulsar wind nebula located in the lmc. we use observations from the very large telescope... | clumps and rings of ejecta in snr 0540-69.3 as seen in 3d |
the mammoth-1 nebula at z = 2.317 is an enormous lyα nebula (elan) extending to a ~440 kpc scale at the center of the extreme galaxy overdensity boss 1441. in this paper, we present observations of the co(3 - 2) and 250 ghz dust-continuum emission from mammoth-1 using the iram northern extended millimeter array. our ob... | discovery of a protocluster core associated with an enormous lya nebula at z = 2.3 |
deep near-infrared photometric surveys are efficient in identifying high-redshift galaxies, however, they can be prone to systematic errors in photometric redshift. this is particularly salient when there is limited sampling of key spectral features of a galaxy's spectral energy distribution (sed), such as for quiescen... | introducing the flamingos-2 split-k medium-band filters: the impact on photometric selection of high-z galaxies in the feniks-pilot survey |
observations and modelling of stars with near-solar masses in their early phases of evolution are critical for a better understanding of how dynamos of solar-type stars evolve. we examine the chemical composition and the spot distribution of the pre-main-sequence solar analogue ek dra. using spectra from the hermes spe... | observing and modelling the young solar analogue ek draconis: starspot distribution, elemental abundances, and evolutionary status |
we reconsider the commonly held assumption that warm debris disks are tracers of terrestrial planet formation. the high occurrence rate inferred for earth-mass planets around mature solar-type stars based on exoplanet surveys (∼20%) stands in stark contrast to the low incidence rate (≤2%-3%) of warm dusty debris around... | rocky planet formation: quick and neat |
aims: star-forming galaxies with nebular he ii emission contain very energetic ionizing sources of radiation, which can be considered as analogs to the major contributors of the reionization of the universe in early epochs. it is therefore of great importance to provide a reliable absolute scale for the equivalent effe... | photon leaking or very hard ionizing radiation? unveiling the nature of he ii-emitters using the softness diagram |
the microwave radiometer on board the juno spacecraft provided a measurement of the water abundance found to range between ~1 and 5.1 times the protosolar abundance of oxygen in the near-equatorial region of jupiter. here, we aim to combine this up-to-date oxygen determination, which is likely to be more representative... | the nature and composition of jupiter's building blocks derived from the water abundance measurements by the juno spacecraft |
giant star-forming regions (clumps) are widespread features of galaxies at z ≈ 1-4. theory predicts that they can play a crucial role in galaxy evolution, if they survive to stellar feedback for >50 myr. numerical simulations show that clumps' survival depends on the stellar feedback recipes that are adopted. up to ... | stellar feedback in a clumpy galaxy at z 3.4 |
we report the detection of very high energy gamma-ray emission from the blazar s3 1227+25 (ver j1230+253) with the very energetic radiation imaging telescope array system (veritas). veritas observations of the source were triggered by the detection of a hard-spectrum gev flare on 2015 may 15 with the fermi-large area t... | veritas discovery of very high energy gamma-ray emission from s3 1227+25 and multiwavelength observations |
context. future and ongoing infrared and radio observatories such as jwst, metis, and alma will increase the amount of rest-frame ir spectroscopic data for galaxies by several orders of magnitude. while studies of the chemical composition of the interstellar medium (ism) based on optical observations have been widely s... | measuring chemical abundances in agn from infrared nebular lines: hii-chi-mistry-ir for agn |
using deep near-infrared keck/mosfire observations, we analyze the rest-optical spectra of eight star-forming galaxies in the cosmos and goods-n fields. we reach integration times of ~10 hr in the deepest bands, pushing the limits on current ground-based observational capabilities. the targets fall into two redshift bi... | ultra-deep keck/mosfire spectroscopic observations of z 2 galaxies: direct oxygen abundances and nebular excitation properties |
the evolution and lifetime of protoplanetary disks (ppds) play a central role in the formation and architecture of planetary systems. astronomical observations suggest that ppds evolve in two timescales, accreting onto the star for up to several million years (myr) followed by gas dissipation within ≲1 myr. because sol... | lifetime of the outer solar system nebula from carbonaceous chondrites |
while there is now a consensus that x-ray binaries (xrbs) are the dominant x-ray sources in the early universe and play a significant role during the epoch of heating of the intergalactic medium (igm), recent studies report contradicting results regarding their contribution in the nebular emission of local universe gal... | the ionizing and heating power of ultraluminous x-ray sources under the geometrical beaming model |
young stellar objects are known to exhibit strong radio variability on timescales of weeks to months, and a few reports have documented extreme radio flares with at least an order of magnitude change in flux density on timescales of hours to days. however, there have been few constraints on the occurrence rate of such ... | extreme radio flares and associated x-ray variability from young stellar objects in the orion nebula cluster |
efforts over 40 yr still leave the source of astronomical infrared emission bands largely unidentified. here, we report the first laboratory infrared (6-25 μm) spectra of gas-phase fullerene-metal complexes, [c60-metal]+ (metal = fe, v) and show with density functional theory calculations that complexes of c60 with cos... | buckyball-metal complexes as potential carriers of astronomical unidentified infrared emission bands |
we investigated the stable isotope fractionation of chromium (cr) for a panorama of chondrites, including eh and el enstatite chondrites and their chondrules and different phases (by acid leaching). we observed that chondrites have heterogeneous δ 53cr values (per mil deviation of the 53cr/52cr from the nist srm 979 st... | chromium stable isotope panorama of chondrites and implications for earth early accretion |
context. ngc 2264 is a young cluster whose accretion properties can be investigated in detail by taking advantage of the flames data in the context of the gaia-eso survey. in fact, the analysis of the hα emission line profile can provide us with information about the accretion and ejection activity of young stars. howe... | the gaia-eso survey: a new diagnostic for accretion and outflow activity in the young cluster ngc 2264 |
enormous lyα nebulae, extending over 300-500 kpc around quasars, represent the pinnacle of galaxy and cluster formation. here we present iram plateau de bure interferometer observations of the enormous lyα nebulae "slug" (z = 2.282) and "jackpot" (z = 2.041). our data reveal bright, synchrotron emission associated with... | a search for dust and molecular gas in enormous lyα nebulae at z ≈ 2 |
the alkali element k is moderately volatile and fluid mobile; thus, it can be influenced by both primary processes (evaporation and recondensation) in the solar nebula and secondary processes (thermal and aqueous alteration) in the parent body. since these primary and secondary processes would induce different isotopic... | early solar system aqueous activity: k isotope evidence from allende |
we present extensive ground-based and hubble space telescope (hst) photometry of the highly reddened, very nearby sn ia 2014j in m82, covering the phases from 9 days before to about 900 days after the b-band maximum. sn 2014j is similar to other normal sne ia near the maximum light, but it shows flux excess in the b ba... | observations of type ia supernova 2014j for nearly 900 days and constraints on its progenitor system |
the tight correlation between turbulence and luminosity in giant hii regions (ghrs) is not well understood. while the luminosity is due to the uv radiation from the massive stars in the ionizing clusters, it is not clear what powers the turbulence. observations of the two prototypical ghrs in the local universe, 30 dor... | supersonic turbulence in giant hii regions: clues from 30 doradus |
we present a detailed analysis of ic 4776, a planetary nebula displaying a morphology believed to be typical of central star binarity. the nebula is shown to comprise a compact hourglass-shaped central region and a pair of precessing jet-like structures. time-resolved spectroscopy of its central star reveals a periodic... | the planetary nebula ic 4776 and its post-common-envelope binary central star |
the first repeating fast radio burst (frb), frb 121102, was found to be associated with a spatially coincident, persistent nonthermal radio source, but the origin of the persistent emission remains unknown. in this paper, we propose that the persistent emission is produced via a synchrotron-heating process by multiple ... | persistent radio emission from synchrotron heating by a repeating fast radio burst source in a nebula |
n103b is a type ia supernova remnant (snr) projected in the outskirts of the superbubble around the rich cluster ngc 1850 in the large magellanic cloud (lmc). we have obtained hα and continuum images of n103b with the hubble space telescope (hst) and high-dispersion spectra with the 4 m and 1.5 m telescopes at cerro to... | physical structures of the type ia supernova remnant n103b |
for pulsars born in supernovae, the expansion of the shocked pulsar wind nebula is initially in the freely expanding ejecta of the supernova. while the nebula is in the inner flat part of the ejecta density profile, the swept-up, accelerating shell is subject to the rayleigh-taylor instability. we carried out two- and ... | pulsar wind bubble blowout from a supernova |
we report the discovery of an ∼100 kpc ionized nebula associated with the radio-quiet type 2 quasar (qso2) nicknamed the `teacup' (z = 0.085). the giant nebula is among the largest known around active galaxies at any z. we propose that it is part of the circumgalactic medium (cgm) of the qso2 host, which has been popul... | a 100 kpc nebula associated with the `teacup' fading quasar |
vela x is a prototypical example of a pulsar wind nebula whose morphology and detailed structure have been affected by interaction with the reverse shock of its host supernova remnant. the resulting complex of filamentary structure and mixed-in ejecta embedded in a nebula that is offset from the pulsar provides the bes... | investigating the structure of vela x |
the famous rosette nebula has an evacuated central cavity formed from the stellar winds ejected from the 2-6 myr old codistant and comoving central star cluster ngc 2244. however, with upper age estimates of less than 110 000 yr, the central cavity is too young compared to ngc 2244 and existing models do not reproduce ... | a new mechanical stellar wind feedback model for the rosette nebula |
protostars and young stars are strongly spatially 'clustered' or 'correlated' within their natal giant molecular clouds. we demonstrate that such clustering leads to the conclusion that the incident bolometric radiative flux upon a random young star/disc is enhanced (relative to volume-averaged fluxes) by a factor that... | most stars (and planets?) are born in intense radiation fields |
ehwc j2019+368 is one of the sources emitting γ-rays with energies higher than 100 tev based on the recent measurement with the high altitude water cherenkov observatory (hawc), and the origin is still in debate. the pulsar psr j2021+3651 is spatially coincident with the tev source. we investigate theoretically whether... | investigating the multiband non-thermal emission of the 100 tev source ehwc j2019+368 with a pulsar wind nebula scenario |
nu ori is a massive spectroscopic and visual binary in the orion nebula cluster, with four components: aa, ab, b, and c. the b0.5 primary (aa) is one of the most massive b-type stars reported to host a magnetic field. we report the detection of a spectroscopic contribution from the c component in high-resolution espado... | nu ori: a hierarchical triple system with a strongly magnetic b-type star |
type ia supernovae are vital to our understanding of the universe due to their use in measuring cosmological distances and their significance in enriching the interstellar medium with heavy elements. they are understood to be the thermonuclear explosions of white dwarfs, but the exact mechanism(s) leading to these expl... | excluding supersoft x-ray sources as progenitors for four type ia supernovae in the large magellanic cloud |
a particularly intriguing recent result from γ-ray astronomy missions is the detection of powerful flares from the crab nebula, which challenges the current understanding of pulsar wind nebulae and acceleration mechanisms. to search for the production site(s) of these flares, we conducted a multi-wavelength observing c... | characterization of the inner knot of the crab: the site of the gamma-ray flares? |
re-observations with the hess telescope array of the very high-energy (vhe) source hess j1018-589 a that is coincident with the fermi-lat γ-ray binary 1fgl j1018.6-5856 have resulted in a source detection significance of more than 9σ and the detection of variability (χ2/ν of 238.3/155) in the emitted γ-ray flux. this v... | discovery of variable vhe γ-ray emission from the binary system 1fgl j1018.6-5856 |
the second gravitational-wave transient catalog reported on 39 compact binary coalescences observed by the advanced ligo and advanced virgo detectors between 1 april 2019 15:00 utc and 1 october 2019 15:00 utc. we present gwtc-2.1, which reports on a deeper list of candidate events observed over the same period. we ana... | gwtc-2.1: deep extended catalog of compact binary coalescences observed by ligo and virgo during the first half of the third observing run |
on may 21, 2019 at 03:02:29 utc advanced ligo and advanced virgo observed a short duration gravitational-wave signal, gw190521, with a three-detector network signal-to-noise ratio of 14.7, and an estimated false-alarm rate of 1 in 4900 yr using a search sensitive to generic transients. if gw190521 is from a quasicircul... | gw190521: a binary black hole merger with a total mass of 150 m⊙ |
the preponderance of matter over antimatter in the early universe, the dynamics of the supernovae that produced the heavy elements necessary for life, and whether protons eventually decay -- these mysteries at the forefront of particle physics and astrophysics are key to understanding the early evolution of our univers... | deep underground neutrino experiment (dune), far detector technical design report, volume ii: dune physics |
the preponderance of matter over antimatter in the early universe, the dynamics of the supernovae that produced the heavy elements necessary for life, and whether protons eventually decay—these mysteries at the forefront of particle physics and astrophysics are key to understanding the early evolution of our universe, ... | volume i. introduction to dune |
previous detections of individual astrophysical sources of neutrinos are limited to the sun and the supernova 1987a, whereas the origins of the diffuse flux of high-energy cosmic neutrinos remain unidentified. on 22 september 2017, we detected a high-energy neutrino, icecube-170922a, with an energy of ~290 tera-electro... | multimessenger observations of a flaring blazar coincident with high-energy neutrino icecube-170922a |
the jiangmen underground neutrino observatory (juno) is a 20 kton liquid scintillator detector in a laboratory at 700-m underground. an excellent energy resolution and a large fiducial volume offer exciting opportunities for addressing many important topics in neutrino and astro-particle physics. with six years of data... | juno physics and detector |
rayleigh-taylor (rt) and richtmyer-meshkov (rm) instabilities play an important role in a wide range of engineering, geophysical, and astrophysical flows. they represent a triggering event that, in many cases, leads to large-scale turbulent mixing. much effort has been expended over the past 140 years, beginning with t... | rayleigh-taylor and richtmyer-meshkov instability induced flow, turbulence, and mixing. i |
rayleigh-taylor (rt) and richtmyer-meshkov(rm) instabilities are well-known pathways towards turbulent mixing layers, in many cases characterized by significant mass and species exchange across the mixing layers (zhou, 2017. physics reports, 720-722, 1-136). mathematically, the pathway to turbulent mixing requires that... | rayleigh-taylor and richtmyer-meshkov instability induced flow, turbulence, and mixing. ii |
the dark energy camera is a new imager with a 2.°2 diameter field of view mounted at the prime focus of the victor m. blanco 4 m telescope on cerro tololo near la serena, chile. the camera was designed and constructed by the dark energy survey collaboration and meets or exceeds the stringent requirements designed for t... | the dark energy camera |
the cherenkov telescope array, cta, will be the major global observatory for very high energy gamma-ray astronomy over the next decade and beyond. the scientific potential of cta is extremely broad: from understanding the role of relativistic cosmic particles to the search for dark matter. cta is an explorer of the ext... | science with the cherenkov telescope array |
we predict enormous, anisotropic piezoelectric effects in intrinsic monolayer group iv monochalcogenides (mx, m=sn or ge, x=se or s), including snse, sns, gese, and ges. using first-principle simulations based on the modern theory of polarization, we find that their piezoelectric coefficients are about one to two order... | giant piezoelectricity of monolayer group iv monochalcogenides: snse, sns, gese, and ges |
we report on international gamma-ray astrophysics laboratory (integral) observations of the soft γ-ray repeater sgr 1935+2154 performed between 2020 april 28 and may 3. several short bursts with fluence of $\sim {10}^{-7}\mbox{--}{10}^{-6}$ erg cm-2 were detected by the imager on-board integral (ibis) instrument in the... | integral discovery of a burst with associated radio emission from the magnetar sgr 1935+2154 |
the preponderance of matter over antimatter in the early universe, the dynamics of the supernovae that produced the heavy elements necessary for life, and whether protons eventually decay—these mysteries at the forefront of particle physics and astrophysics are key to understanding the early evolution of our universe, ... | volume iv. the dune far detector single-phase technology |
neutrino-nuclear responses associated with astro-neutrinos, single beta decays and double beta decays are crucial in studies of neutrino properties of interest for astro-particle physics. the present report reviews briefly recent studies of the neutrino-nuclear responses from both experimental and theoretical points of... | neutrino-nuclear responses for astro-neutrinos, single beta decays and double beta decays |
2d van der waals ferroelectrics have emerged as an attractive building block with immense potential to provide multifunctionality in nanoelectronics. although several accomplishments have been reported in ferroelectric switching for out-of-plane ferroelectrics down to the monolayer, a purely in-plane ferroelectric has ... | purely in-plane ferroelectricity in monolayer sns at room temperature |
pair-instability supernovae are thought to restrict the formation of black holes in the mass range $\sim 50\mbox{--}135\,{m}_{\odot }$ . however, black holes with masses within this "high mass gap" are expected to form as the remnants of binary black hole mergers. these remnants can merge again dynamically in densely p... | gw190521: orbital eccentricity and signatures of dynamical formation in a binary black hole merger signal |
in diverse areas of science and technology, including inertial confinement fusion (icf), astrophysics, geophysics, and engineering processes, turbulent mixing induced by hydrodynamic instabilities is of scientific interest as well as practical significance. because of the fundamental roles they often play in icf and ot... | turbulent mixing and transition criteria of flows induced by hydrodynamic instabilities |
the group-iv monochalcogenides sns, snse, ges, and gese form a family within the wider group of semiconductor "phosphorene analogues." here, we used first-principles calculations to investigate systematically their structural, electronic, and optical properties, analyzing the changes associated with the reduction of di... | phosphorene analogues: isoelectronic two-dimensional group-iv monochalcogenides with orthorhombic structure |
thermoelectric technology allows conversion between heat and electricity. many good thermoelectric materials contain rare or toxic elements, so developing low-cost and high-performance thermoelectric materials is warranted. here, we report the temperature-dependent interplay of three separate electronic bands in hole-d... | high thermoelectric performance in low-cost sns0.91se0.09 crystals |
collisionless shocks can be produced as a result of strong magnetic fields in a plasma flow, and therefore are common in many astrophysical systems. the weibel instability is one candidate mechanism for the generation of sufficiently strong fields to create a collisionless shock. despite their crucial role in astrophys... | observation of magnetic field generation via the weibel instability in interpenetrating plasma flows |
in order to improve super-kamiokande's neutron detection efficiency and to thereby increase its sensitivity to the diffuse supernova neutrino background flux, 13 tons of gd2(so4)3 ⋅8h2 o (gadolinium sulfate octahydrate) was dissolved into the detector's otherwise ultrapure water from july 14 to august 17, 2020, marking... | first gadolinium loading to super-kamiokande |
grb 221009a has been referred to as the brightest of all time (boat). we investigate the veracity of this statement by comparing it with a half century of prompt gamma-ray burst observations. this burst is the brightest ever detected by the measures of peak flux and fluence. unexpectedly, grb 221009a has the highest is... | grb 221009a: the boat |
tin selenide (snse) and tin sulfide (sns) have recently attracted particular interest due to their great potential for large-scale thermoelectric applications. a complete prediction of the thermoelectric performance and the understanding of underlying heat and charge transport details are the key to further improvement... | first-principles study of anisotropic thermoelectric transport properties of iv-vi semiconductor compounds snse and sns |
a central concept in the modern understanding of turbulence is the existence of cascades of excitations from large to small length scales, or vice versa. this concept was introduced in 1941 by kolmogorov and obukhov, and such cascades have since been observed in various systems, including interplanetary plasmas, supern... | emergence of a turbulent cascade in a quantum gas |
in the past few years, f(q) theories have drawn a lot of research attention in replacing einstein's theory of gravity successfully. the current study examines the novel cosmological possibilities emerging from two specific classes of f(q) models using the parametrization form of the equation of state (eos) parameter as... | observational constraints on two cosmological models of f(q) theory |
low-dimensional multiferroic materials hold great promises in miniaturized device applications such as nanoscale transducers, actuators, sensors, photovoltaics, and nonvolatile memories. here, using first-principles theory we predict that two-dimensional (2d) monolayer group iv monochalcogenides including ges, gese, sn... | two-dimensional multiferroics in monolayer group iv monochalcogenides |
large neutrino event numbers in future experiments measuring coherent elastic neutrino nucleus scattering allow precision measurements of standard and new physics. we analyze the current and prospective limits of a light scalar particle coupling to neutrinos and quarks, using coherent and conus as examples. both lepton... | probing neutrino coupling to a light scalar with coherent neutrino scattering |
a lingering mystery in core-collapse supernova theory is how collective neutrino oscillations affect the dynamics. all previously identified flavor instabilities, some of which might make the effects considerable, are essentially collisionless phenomena. here, it is shown that collisional instabilities exist as well. t... | collisional flavor instabilities of supernova neutrinos |
maximizing the discovery potential of increasingly precise neutrino experiments will require an improved theoretical understanding of neutrino-nucleus cross sections over a wide range of energies. low-energy interactions are needed to reconstruct the energies of astrophysical neutrinos from supernovae bursts and search... | theoretical tools for neutrino scattering: interplay between lattice qcd, efts, nuclear physics, phenomenology, and neutrino event generators |
one of the greatest uncertainties in any modeling of the inner engine of core-collapse supernova (ccsn) is neutrino-flavor conversions driven by neutrino self-interactions. we carry out large-scale numerical simulations of a multienergy, multiangle, three-flavor framework and general relativistic quantum kinetic neutri... | roles of fast neutrino-flavor conversion on the neutrino-heating mechanism of core-collapse supernova |
typical microseismic data recorded by surface arrays are characterized by low signal-to-noise ratios (s/ns) and highly nonstationary noise that make it difficult to detect small events. currently, array or crosscorrelation-based approaches are used to enhance the s/n prior to processing. we have developed an alternativ... | automatic microseismic denoising and onset detection using the synchrosqueezed continuous wavelet transform |
astrophysical neutrinos are excellent probes of astroparticle physics and high-energy physics. with energies far beyond solar, supernovae, atmospheric, and accelerator neutrinos, high-energy and ultra-high-energy neutrinos probe fundamental physics from the tev scale to the eev scale and beyond. they are sensitive to p... | high-energy and ultra-high-energy neutrinos: a snowmass white paper |
cosmography is an ideal tool to investigate the cosmic expansion history of the universe in a model-independent way. the equations of motion in modified theories of gravity are usually very complicated; cosmography may select practical models without imposing arbitrary choices a priori. we use the model-independent way... | cosmography in f (q ) gravity |
new classes of two-dimensional (2d) materials beyond graphene, including layered and non-layered, and their heterostructures, are currently attracting increasing interest due to their promising applications in nanoelectronics, optoelectronics and clean energy, where thermal transport is a fundamental physical parameter... | diverse anisotropy of phonon transport in two-dimensional group iv-vi compounds: a comparative study |
we explore the thermoelectric and phonon transport properties of two-dimensional monochalcogenides (snse, sns, gese, and ges) using density functional theory combined with boltzmann transport theory. we studied the electronic structures, seebeck coefficients, electrical conductivities, lattice thermal conductivities, a... | thermoelectric and phonon transport properties of two-dimensional iv-vi compounds |
we revise the bound from the supernova sn1987a on the coupling of ultralight axion-like particles (alps) to photons. in a core-collapse supernova, alps would be emitted via the primakoff process, and eventually convert into gamma rays in the magnetic field of the milky way. the lack of a gamma-ray signal in the grs ins... | revisiting the sn1987a gamma-ray limit on ultralight axion-like particles |
we present ground-based and swift photometric and spectroscopic observations of the candidate tidal disruption event (tde) asassn-14li, found at the centre of pgc 043234 (d ≃ 90 mpc) by the all-sky automated survey for supernovae (asas-sn). the source had a peak bolometric luminosity of l ≃ 1044 erg s-1 and a total int... | six months of multiwavelength follow-up of the tidal disruption candidate asassn-14li and implied tde rates from asas-sn |
hydrodynamic instabilities such as rayleigh-taylor (rt) and richtmyer-meshkov (rm) instabilities usually appear in conjunction with the kelvin-helmholtz (kh) instability and are found in many natural phenomena and engineering applications. they frequently result in turbulent mixing, which has a major impact on the over... | rayleigh-taylor and richtmyer-meshkov instabilities: a journey through scales |
the primary goal of the coherent collaboration is to measure and study coherent elastic neutrino-nucleus scattering (cevns) using the high-power, few-tens-of-mev, pulsed source of neutrinos provided by the spallation neutron source (sns) at oak ridge national laboratory (ornl). the coherent collaboration reported the f... | coherent 2018 at the spallation neutron source |
recent observations using the atacama cosmology telescope (act) have provided ground-based cosmic microwave background (cmb) maps with higher angular resolution than the planck satellite. these have the potential to put interesting constraints on models resolving the "hubble tension." in this paper we fit two models of... | dark energy at early times and act data: a larger hubble constant without late-time priors |
we present here up-to-date neutrino mass limits exploiting the most recent cosmological data sets. by making use of the cosmic microwave background temperature fluctuation and polarization measurements, supernovae ia luminosity distances, baryon acoustic oscillation observations and determinations of the growth rate pa... | most constraining cosmological neutrino mass bounds |
new measurements of the expansion rate of the universe have plunged the standard model of cosmology into a severe crisis. in this letter, we propose a simple resolution to the problem that relies on a first order phase transition in a dark sector in the early universe, before recombination. this will lead to a short ph... | new early dark energy |
numerical simulations are a versatile tool for providing insight into the complicated process of structure formation in cosmology. this process is mainly governed by gravity, which is the dominant force on large scales. at present, a century after the formulation of general relativity, numerical codes for structure for... | general relativity and cosmic structure formation |
we propose a novel model in the framework of f (q) gravity, which is a gravitational modification class arising from the incorporation of non-metricity. the model has general relativity as a particular limit, it has the same number of free parameters to those of λcdm, however at a cosmological framework it gives rise t... | first evidence that non-metricity f(q) gravity could challenge λcdm |
gw190521 is the first confident observation of a binary black hole merger with total mass $m\gt 100\,{m}_{\odot }$ . given the lack of observational constraints at these masses, we analyze gw190521 considering two different priors for the binary's masses: uniform in mass ratio and source-frame total mass, and uniform i... | gw190521 may be an intermediate-mass ratio inspiral |
in this paper we present new constraints on the hubble parameter h0 using: (i) the available data on h(z) obtained from cosmic chronometers (cch); (ii) the hubble rate data points extracted from the supernovae of type ia (snia) of the pantheon compilation and the hubble space telescope (hst) candels and clash multy-cyc... | h0 from cosmic chronometers and type ia supernovae, with gaussian processes and the novel weighted polynomial regression method |
we present an analysis of 15 type ia supernovae (sne ia) at redshift z> 1 (9 at 1.5< z< 2.3) recently discovered in the candels and clash multi-cycle treasury programs using wfc3 on the hubble space telescope. we combine these sne ia with a new compilation of ∼1050 sne ia, jointly calibrated and corrected for ... | type ia supernova distances at redshift >1.5 from the hubble space telescope multi-cycle treasury programs: the early expansion rate |
we use observational data from supernovae (snia) pantheon sample, as well as from direct measurements of the hubble parameter from the cosmic chronometers (cc) sample, in order to extract constraints on the scenario of barrow holographic dark energy. the latter is a holographic dark energy model based on the recently p... | observational constraints on barrow holographic dark energy |
inferring high-fidelity constraints on the spatial curvature parameter, ωk, under as few assumptions as possible, is of fundamental importance in cosmology. we propose a method to non-parametrically infer ωk from late-universe probes alone. using gaussian processes (gps) to reconstruct the expansion history, we combine... | non-parametric spatial curvature inference using late-universe cosmological probes |
the zwicky transient facility (ztf) is performing a three-day cadence survey of the visible northern sky (∼3π) with newly found transient candidates announced via public alerts. the ztf bright transient survey (bts) is a large spectroscopic campaign to complement the photometric survey. bts endeavors to spectroscopical... | the zwicky transient facility bright transient survey. i. spectroscopic classification and the redshift completeness of local galaxy catalogs |
a constant early dark energy (ede) component contributing a fraction fede(zc)∼10 % of the energy density of the universe around zc≃3500 and diluting as or faster than radiation afterwards, can provide a simple resolution to the hubble tension, the ∼5 σ discrepancy—in the λ cdm context—between the h0 value derived from ... | early dark energy resolution to the hubble tension in light of weak lensing surveys and lensing anomalies |
in this work, we provide updated constraints on coupled dark energy (cde) cosmology with peebles-ratra (pr) potential and constant coupling strength β . this modified gravity scenario introduces a fifth force between dark matter particles, mediated by a scalar field that plays the role of dark energy. the mass of the d... | update on coupled dark energy and the h0 tension |
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