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the reactor antineutrino energy spectra and flux were reevaluated during the preparation of the recent experiments devoted to the measurement of $\theta_{13}$. consequently some discrepancies between data and the theoretical predictions in reactor antineutrino experiments at short distances were observed when using the... | status of the solid experiment: search for sterile neutrinos at the sck$\\cdot$cen br2 reactor |
observation of the oscillation pattern as a function of distance from the neutrino source will provide a very strong argument in favor of neutrino mixing with sterile neutrinos and their existence. sox experiment will perform such measurement. a strong antineutrino generator 144ce-144pr (ceang) with the activity betwee... | status of the sox experiment |
it has recently been suggested that the neutrino mass hierarchy can be determined from the oscillation pattern of atmospheric neutrinos passing through the earth in the energy regime of about 3-20 gev. in this paper we present the status of a feasibility study for 'oscillation research with cosmics in the abyss' (orca)... | orca: measuring the neutrino mass hierarchy with an underwater cherenkov detector |
nulat is a new detector designed to study reactor anti-neutrinos at short baselines. nulat is based on the raghavan optical lattice (rol), which uses segmented 6li doped plastic cubical cells, separated by air gaps to take advantage of total internal reflection. the first phase of nulat contains 125 cubes (5x5x5), each... | nulat: a novel design for a reactor anti-neutrino detector |
the measurement of the neutrino mass ordering (nmo), i.e. the ordering of the three neutrino mass eigenstates, is a major goal of many future experiments. one strategy to measure the nmo is observing matter effects in the oscillation pattern of atmospheric neutrinos as proposed for the precision next generation upgrade... | results from testing the neutrino mass ordering with three years of icecube deepcore data |
the liquid argon time projection chamber (lartpc) is poised to play a leading role in neutrino physics experiments, particularly with the launch of the short baseline neutrino program at fermilab, and the deep underground neutrino experiment (dune) in south dakota. the lartpc hardware has recently seen great advances o... | deep learning in lartpcs with sbnd |
all massive stars end their lives with core collapse and many as supernova explosions. despite observations of thousands of supernovae, detailed numerical calculations and theoretical efforts, the mechanism of explosion is poorly understood. in the most-investigated ``neutrino explosion mechanism,'' the collapse turns ... | the critical neutrino luminosity of the core-collapse supernova explosions |
t2k is a long baseline neutrino experiment designed for observation of neutrino oscillations and measurement of cross sections. an intense muon neutrino beam generated at the j-parc facility is directed to the far detector super-kamiokande (super-k) 295 km away. t2k beam events detected in super-k can be separated from... | t2k far detector event reduction, reconstruction and selection |
the neutrinophilic two higgs doublet model is one of the simplest models to explain the origin of tiny dirac neutrino masses. this model introduces a new higgs doublet with ev scale vev to naturally generate the tiny neutrino masses. depending on the same yukawa coupling, the neutrino oscillation patterns can be probed... | probing dirac neutrino properties with dilepton signature |
we analyse the radiative stability of the next-to-tribimaximal mixings ($ntbm$) with the variation of susy breaking scale ($m_s$) in mssm, for both normal ordering (no) and inverted ordering (io) at the fixed input value of seesaw scale $m_r = 10^{15}$ gev and two different values of $\tan \beta$. all the neutrino osci... | stability of the next-to-tribimaximal mixings under radiative corrections with the variation of susy breaking scale in mssm |
solid, located at sck-cen in mol, belgium, is a reactor antineutrino experiment at a very short baseline of 5.5 -- 10m aiming at the search for sterile neutrinos and for high precision measurement of the neutrino energy spectrum of uranium-235. it uses a novel approach using lithium-6 sheets and pvt cubes as scintillat... | trigger for the solid reactor antineutrino experiment |
we present a doubly parametric extension of the standard froggatt-nielsen (fn) mechanism. as is well known, mass matrices of the up- and down-type quark sectors and the charged lepton sector in the standard model can be parametrized well by a parameter λ which is usually taken to be the sine of the cabibbo angle (λ=sin... | double froggatt-nielsen mechanism |
image decomposition plays a crucial role in various computer vision tasks, enabling the analysis and manipulation of visual content at a fundamental level. overlapping images, which occur when multiple objects or scenes partially occlude each other, pose unique challenges for decomposition algorithms. the task intensif... | deep-learning-based decomposition of overlapping-sparse images: application at the vertex of neutrino interactions |
we develop an $a_4 \times z_4 \times z_2$ symmetry extension of standard model under the minimal extended seesaw (mes) mechanism which successfully predicts neutrino masses and mixings patterns. this model breaks $\mu-\tau$ symmetry of neutrino mass matrix and explains leptonic mixing with non-zero $\theta_{13}$. we st... | kev dark matter in minimal extended seesaw model and its predictions in neutrinoless double beta decay and baryogenesis |
we summarize the status of deep underground neutrino experiment (dune) offline software and computing program. we describe plans for the computing infrastructure needed to acquire, catalog, reconstruct, simulate and analyze the data from the dune experiment and its prototypes in pursuit of the experiment's physics goal... | status of dune offline computing |
we derive the lower bound on absolute scale of lightest neutrino mass for normal hierarchy and inverted hierarchy pattern of light neutrinos by studying the new physics contributions to charged lepton flavour violating decays and neutrinoless double beta decay in the framework of a tev scale left-right symmetric model.... | determining neutrino mass hierarchy in an extended left-right model |
the proposed 50 kt iron calorimeter (ical) detector at the india-based neutrino observatory (ino) aims to detect atmospheric muon neutrinos and antineutrinos separately in the multi-gev range of energies and over a wide range of path lengths. while passing through the earth, the upward-going neutrinos experience a dens... | probing the earth's core using atmospheric neutrinos at ino |
the relations between star formation and properties of molecular clouds (mcs) are studied based on a sample of star-forming regions in the galactic plane. sources were selected by having radio recombination lines to provide identification of associated mcs and dense clumps. radio continuum emission and mid-infrared emi... | star formation relations in the milky way |
selenium (se) solar cells were the world's first solid-state photovoltaics reported in 1883, opening the modern photovoltaics. however, its wide bandgap (~1.9 ev) limits sunlight harvesting. here, we revisit the world's oldest but long-ignored photovoltaic material with the emergence of indoor photovoltaics (ipvs); the... | indoor photovoltaics awaken the world's first solar cells |
we present ∼0.15 arcsec spatial resolution imaging of shizels-14, a massive ( $m_{*}\sim 10^{11}\, \rm {m_{\odot }}$ ), dusty, star-forming galaxy at z = 2.24. our rest-frame ${\sim}1\, \rm {kpc}$ -scale, matched-resolution data comprise four different widely used tracers of star formation: the $\rm {h}\,\alpha$ emissi... | resolving a dusty, star-forming shizels galaxy at z = 2.2 with hst, alma, and sinfoni on kiloparsec scales |
in this paper, we present a database of class i methanol masers. the compiled information from the available literature provides an open and fast access to the data on class i methanol maser emission, including search, analysis, and visualization of the extensive maser data set. there is information on individual maser... | online database of class i methanol masers |
it is important to determine if massive stars form via disc accretion, like their low-mass counterparts. theory and observation indicate that protostellar jets are a natural consequence of accretion discs and are likely to be crucial for removing angular momentum during the collapse. however, massive protostars are typ... | measuring the ionisation fraction in a jet from a massive protostar |
accurate disk mass measurements are necessary to constrain disk evolution and the timescale of planet formation, but such measurements are difficult to make and are very dependent on assumptions. here, we look at the assumption that the disk is optically thin at radio wavelengths and the effect of this assumption on me... | measuring the dust masses of protoplanetary disks in lupus with alma: evidence that disks can be optically thick at 3 mm |
hcn(1-0) emission traces dense gas and correlates very strongly with star formation rates (sfrs) on scales from small milky way clouds to whole galaxies. the observed correlation offers strong constraints on the efficiency of star formation in dense gas, but quantitative interpretation of this constraint requires a map... | numerical calibration of the hcn-star formation correlation |
we present the first systematic search for uv signatures from radio source-driven agn feedback in compact steep spectrum (css) radio galaxies. owing to their characteristic sub-galactic jets (1-20 kpc projected linear sizes), css hosts are excellent laboratories for probing galaxy scale feedback via jet-triggered star ... | optical- & uv-continuum morphologies of compact radio source hosts |
in conjunction with a previous southern-hemisphere work, we present the largest radio survey of jets from massive protostars to date with high-resolution (~0.04 arcsec) jansky very large array observations towards two subsamples of massive star-forming regions of different evolutionary statuses: 48 infrared-bright, mas... | a galactic survey of radio jets from massive protostars |
context. stellar bow shocks have been studied not only observationally, but also theoretically since the late 1980s. only a few catalogues of them exist. the bow shocks show emission along all the electromagnetic spectrum, but they are detected more easily in infrared wavelengths. the release of new and high-quality in... | e-boss: an extensive stellar bow shock survey. ii. catalogue second release |
dwarf galaxies are characterized by a very low luminosity and low mass. because of significant accretion and ejection activity of massive black holes, some dwarf galaxies also host low-luminosity active galactic nuclei (agns). in a few dwarf agns, very long baseline interferometry (vlbi) observations have found faint n... | intermediate-mass black holes: finding of episodic, large-scale, and powerful jet activity in a dwarf galaxy |
we report on the first bird’s-eye view of the innermost accretion disk around the high-mass protostellar object g353.273+0.641, taken by atacama large millimeter/submillimeter array long baselines. the disk traced by dust continuum emission has a radius of 250 au, surrounded by the infalling rotating envelope traced by... | the first bird’s-eye view of a gravitationally unstable accretion disk in high-mass star formation |
in view of the recent recalibration of the sunspot number time series ssn2, a need has arisen to re-evaluate solar and ionospheric indices in the international reference ionosphere, iri, and its extension to the plasmasphere, iri-plas models, which are developed using the predecessor ssn1 index. to improve efficiency o... | eight proxy indices of solar activity for the international reference ionosphere and plasmasphere model |
measuring the h i-halo mass scaling relation (hihm) is fundamental to understanding the role of h i in galaxy formation and its connection to structure formation. while direct measurements of the h i mass in haloes are possible using h i-spectral stacking, the reported shape of the relation depends on the techniques us... | unveiling the atomic hydrogen-halo mass relation via spectral stacking |
irregular time evolution of the radio emission generated in a b2-class microflare (sol2017-01-25t10:15), occurring on 2017 january 25 in active region 12,628, is studied. the microflare was apparently initiated by an appearance of an s-shaped loop, observed in the euv band. the radio emission is associated with the non... | quasi-periodic pulsations in a solar microflare |
atomic samarium has been injected into the neutral atmosphere for production of electron clouds that modify the ionosphere. these electron clouds may be used as high-frequency radio wave reflectors or for control of the electrodynamics of the f region. a self-consistent model for the photochemical reactions of samarium... | a physics-based model for the ionization of samarium by the mosc chemical releases in the upper atmosphere |
to study the atomic, molecular, and ionized emission of giant molecular clouds (gmcs) in the milky way, we initiated a large program with the karl g. jansky very large array (vla): "thor: the h i, oh, recombination line survey of the milky way". we map the 21 cm h i line, 4 oh lines, up to 19 hα recombination lines and... | thor: the h i, oh, recombination line survey of the milky way. the pilot study: h i observations of the giant molecular cloud w43 |
the galaxy cluster abell 746 (a746; $z$=0.214), featuring a double radio relic system, two isolated radio relics, a possible radio halo, disturbed v-shaped x-ray emission, and intricate galaxy distributions, is a unique and complex merging system. we present a weak-lensing analysis of a746 based on wide-field imaging d... | weak-lensing analysis of the complex cluster merger abell 746 with subaru/hyper suprime-cam |
parsec-scale separation supermassive black hole binaries in the centre of gas-rich galaxy merger remnants could be surrounded by massive circumbinary discs (cbds). black hole mass and spin evolution during the gas-rich binary inspiral are crucial in determining the direction and power of relativistic jets that radio ob... | dynamics and spin alignment in massive, gravito-turbulent circumbinary discs around supermassive black hole binaries |
we present the analysis of ~100 pc scale compact radio continuum sources detected in 63 local (ultra)luminous infrared galaxies (u/lirgs; l ir ≥ 1011 l ⊙), using fwhm ≲ 0.″1-0.″2 resolution 15 and 33 ghz observations with the karl g. jansky very large array. we identify a total of 133 compact radio sources with effecti... | characterizing compact 15-33 ghz radio continuum sources in local u/lirgs |
radio relics are diffuse synchrotron sources in the outskirts of merging galaxy clusters energized by the merger shocks. in this paper, we present an overview of the radio relics in massive cluster mergers identified in the new tng-cluster simulation. this is a suite of magnetohydrodynamical cosmological zoom-in simula... | radio relics in massive galaxy cluster mergers in the tng-cluster simulation |
we study the incidence of nuclear activity in a large sample of massive post-starburst (psb) galaxies at $z\sim 0.7$ selected from the sloan digital sky survey, and identify active galactic nuclei based on radio continuum and optical emission lines. over our mass range of ${10}^{10.6}\mbox{--}{10}^{11.5}$ ${m}_{\odot }... | the role of active galactic nuclei in the quenching of massive galaxies in the squigg ěc{l} e survey |
we present a sub-arcsec resolution radio imaging survey of a sample of 76 low-luminosity active galactic nuclei (llagn) that were previously not detected with the very large array at 15 ghz. compact, parsec-scale radio emission has been detected above a flux density of 40 μ jy in 60% (45 of 76) of the llagn sample. we ... | 15-ghz radio emission from nearby low-luminosity active galactic nuclei |
ngc 4395 is a dwarf galaxy at a distance of about 4.3 mpc (scale: ~0.021 pc mas-1). it hosts an intermediate-mass black hole (imbh) with a mass between ~104 and ~105 solar masses. the early radio observations of ngc 4395 with the very long baseline interferometry (vlbi) network, high sensitivity array (hsa), at 1.4 ghz... | is there a sub-parsec-scale jet base in the nearby dwarf galaxy ngc 4395? |
the compact mm-wavelength signal in the central cavity of the pds 70 disc, revealed by deep alma observations, is aligned with unresolved h α emission, and is thought to stem from a circumplanetary disc (cpd) around pds 70c. we revisit the available alma data on pds 70c with alternative imaging strategies, and with spe... | variable structure in the pds 70 disc and uncertainties in radio-interferometric image restoration |
context. the 15n fractionation has been observed to show large variations among astrophysical sources, depending both on the type of target and on the molecular tracer used. these variations cannot be reproduced by the current chemical models.aims: until now, the 14n/15n ratio in n2h+ has been accurately measured in on... | 14n/15n ratio measurements in prestellar cores with n2h+: new evidence of 15n-antifractionation |
the study of long-term evolution of neutron star (ns) magnetic fields is key to understanding the rich diversity of ns observations, and to unifying their nature despite the different emission mechanisms and observed properties. such studies in principle permit a deeper understanding of the most important parameters dr... | simulated magnetic field expulsion in neutron star cores |
we study the kinematics of the as 209 disk using the j = 2-1 transitions of 12co, 13co, and c18o. we derive the radial, azimuthal, and vertical velocity of the gas, taking into account the lowered emission surface near the annular gap at ≃1.″7 (200 au) within which a candidate circumplanetary-disk-hosting planet has be... | molecules with alma at planet-forming scales (maps): complex kinematics in the as 209 disk induced by a forming planet and disk winds |
in this study we analyze 70 radio continuum sources that are associated with dust clumps and which are considered to be candidates for the earliest stages of high-mass star formation. the detection of these sources was reported by rosero et al., who found most of them to show weak (< 1 mjy) and compact (< 0.″6) r... | weak and compact radio emission in early high-mass star-forming regions. ii. the nature of the radio sources |
context. high-mass analogues of low-mass prestellar cores are searched for to constrain the models of high-mass star formation. several high-mass cores, at various evolutionary stages, have been recently identified towards the massive star-forming region w43-mm1 and amongst them a high-mass prestellar core candidate.ai... | molecular analysis of a high-mass prestellar core candidate in w43-mm1 |
context. weak and compact radio continuum and h2o masers are preferred tracers of the outflow activity nearby very young stars.aims: we want to image the centimeter free-free continuum emission in the range 1-7 cm (26-4 ghz), which arises in the inner few 1000 au from those young stars also associated with bright h2o m... | protostellar outflows at the earliest stages (poets). i. radio thermal jets at high resolution nearby h2o maser sources |
context. electric field measurements of the time domain sampler (tds) receiver, part of the radio and plasma waves (rpw) instrument on board solar orbiter, often exhibit very intense broadband wave emissions at frequencies below 20 khz in the spacecraft frame. during the first year of the mission, the rpw/tds instrumen... | first-year ion-acoustic wave observations in the solar wind by the rpw/tds instrument on board solar orbiter |
we report the discovery of intense, highly directional radio emission from the bp star hd 35298, which we interpret as the consequence of electron cyclotron maser emission (ecme). the star was observed with the giant metrewave radio telescope near the rotational phases of both magnetic nulls in band 4 (550-750 mhz) and... | the fifth main-sequence magnetic b-type star showing coherent radio emission: is this really a rare phenomenon? |
intermediate-mass black holes (imbhs, $10^{3\!-\!6} \, {\rm m_\odot }$), are typically found at the centre of dwarf galaxies and might be wandering, thus far undetected, in the milky way (mw). we use model spectra for advection-dominated accretion flows to compute the typical fluxes, in a range of frequencies spanning ... | detectability of wandering intermediate-mass black holes in the milky way galaxy from radio to x-rays |
photoevaporation is probably the main agent for gas dispersal during the last stages of protoplanetary disk evolution. however, the overall mass-loss rate in the photoevaporative wind and its driving mechanism are still not well understood. here we report multi-configuration very large array observations at 0.7, 3, and... | imaging the photoevaporating disk and radio jet of gm aur |
the keplerian rotation in protoplanetary disks can be used to robustly measure stellar masses at very high precision if the source distance is known. we present atacama large millimeter/submillimeter array (alma) observations of spatially and spectrally resolved 12co (2-1) emission toward the disks around 2mass j162627... | high-precision dynamical masses of pre-main-sequence stars with alma and gaia |
we present multiwavelength observations of the persistent fermi-large area telescope unidentified γ-ray source 1fgl j1417.7-4407, showing it is likely to be associated with a newly discovered x-ray binary containing a massive neutron star (nearly 2 {{m}⊙ }) and a ∼ 0.35 {{m}⊙ } giant secondary with a 5.4 day period. so... | 1fgl j1417.7-4407: a likely gamma-ray bright binary with a massive neutron star and a giant secondary |
context. atacama large millimeter/submillimeter array (alma) observations of the high-mass star-forming region g35.20-0.74n have revealed the presence of a keplerian disk in core b rotating about a massive object of 18 m⊙, as computed from the velocity field. the luminosity of such a massive star would be comparable to... | binary system and jet precession and expansion in g35.20-0.74n |
the optical and uv properties of radio-quiet (rq) and radio-loud (rl, relativistically "jetted") active galactic nuclei (agn) are known to differ markedly; however, it is still unclear what is due to a sample selection and what is associated with intrinsic differences in the inner workings of their emitting regions. ch... | metal content in relativistically jetted and radio-quiet quasars in the main sequence context |
we present new atca multiwavelength radio measurements (range 2.1-21.2 ghz) of the early-type magnetic star ρ oph a, performed in 2019 march during three different observing sessions. these new atca observations evidence a clear rotational modulation of the stellar radio emission and the detection of coherent auroral r... | evidence for radio and x-ray auroral emissions from the magnetic b-type star ρ oph a |
the purple mountain observatory 13.7 m radio telescope has been used to search for 95 ghz (80-71a+) class i methanol masers toward 1020 bolocam galactic plane survey (bgps) sources, leading to 213 detections. we have compared the line width of the methanol and hco+ thermal emission in all of the methanol detections, an... | a new 95 ghz methanol maser catalog. i. data |
context. several radio sources have been detected in the high-mass star-forming region w75n(b), with the massive young stellar objects vla 1 and vla 2 shown to be of particular interest among them. these objects are thought to be at different evolutionary stages: vla 1 is in the early stage of photoionization and drivi... | monitoring of the polarized h2o maser emission around the massive protostars w75n(b)-vla 1 and w75n(b)-vla 2 |
the cygnus x complex is covered by the global view of star formation in the milky way (glostar) survey, an unbiased radio-wavelength galactic plane survey, in 4-8 ghz continuum radiation and several spectral lines. the glostar survey observed the 6.7 ghz transition of methanol (ch3oh), an exclusive tracer of high-mass ... | a global view on star formation: the glostar galactic plane survey. iii. 6.7 ghz methanol maser survey in cygnus x |
large-amplitude waves near the electron plasma frequency are found by the magnetospheric multiscale (mms) mission near earth's magnetopause. the waves are identified as langmuir and upper hybrid (uh) waves, with wave vectors either close to parallel or close to perpendicular to the background magnetic field. the waves ... | large-amplitude high-frequency waves at earth's magnetopause |
when a black hole accretes close to the eddington limit, the astrophysical jet is often accompanied by radiatively driven, wide-aperture and mildly relativistic winds. powerful winds can produce significant non-thermal radio emission via shocks. among the nearby critical accretion quasars, pds 456 has a very massive bl... | the nearby extreme accretion and feedback system pds 456: finding a complex radio-emitting nucleus |
pulsar timing has enabled some of the strongest tests of fundamental physics. central to the technique is the assumption that the detected radio pulses can be used to accurately measure the rotation of the pulsar. here, we report on a broadband variation in the pulse profile of the millisecond pulsar j1643-1224. a new ... | the disturbance of a millisecond pulsar magnetosphere |
we report an atacama large millimeter/submillimeter array 0.88 mm (band 7) continuum detection of the accretion disk around sr 12 c, an ~11 m jup planetary-mass companion (pmc) orbiting its host binary at 980 au. this is the first submillimeter detection of a circumplanetary disk around a wide pmc. the disk has a flux ... | alma discovery of a disk around the planetary-mass companion sr 12 c |
uranus and neptune possess highly tilted/offset magnetic fields whose interaction with the solar wind shapes unique twin asymmetric, highly dynamical, magnetospheres. these radiate complex auroral emissions, both reminiscent of those observed at the other planets and unique to the ice giants, which have been detected a... | auroral emissions from uranus and neptune |
in the standard picture of radio pulsars, the radio emission arises from a set of open magnetic field lines, the extent of which is primarily determined by the pulsar's spin period, p, and the emission height. we have used a data base of parameters from 600 pulsars to show that the observed profile width, w, follows w ... | the period-width relationship for radio pulsars revisited |
hd 142990 is a bp-type star with a nearly dipolar surface magnetic field of kilogauss strength. recently, lenc et al. reported the tentative discovery of electron cyclotron maser emission (ecme) from this star at 200 mhz. this type of emission has been observed from only three other hot magnetic stars. in this paper, w... | detection of coherent emission from the bp star hd 142990 at ugmrt frequencies |
aims: we estimate the number of pulsars, detectable as continuous gravitational wave sources with the current and future gravitational-wave detectors, assuming a simple phenomenological model of evolving non-axisymmetry of the rotating neutron star.methods: we employed a numerical model of the galactic neutron star pop... | detectability of continuous gravitational waves from isolated neutron stars in the milky way. the population synthesis approach |
we present an analytical study of light curves of slowly rotating radio pulsars with emphasis on the chromatic effects derived from the presence of a plasma environment; analyzing the effects of the compactness, the metric model, and the electronic plasma density profile. after doing a numerical integration of the traj... | analytical expressions for pulse profile of neutron stars in plasma environments |
a relationship between dust-reprocessed light from recent star formation and the amount of star-forming gas in a galaxy produces a correlation between wide-field infrared survey explorer (wise) 12 μm emission and co line emission. here, we explore this correlation on kiloparsec scales with co(1-0) maps from edge-califa... | a new estimator of resolved molecular gas in nearby galaxies |
throughout 2017, the hubble space telescope (hst) observed the northern far-ultraviolet aurorae of saturn at northern solstice, during the cassini grand finale. these conditions provided a complete viewing of the northern auroral region from earth and a maximal solar illumination, expected to maximize the ionosphere-ma... | saturn's northern aurorae at solstice from hst observations coordinated with cassini's grand finale |
protostellar jets have a fundamental role at the earliest evolution of protostars of all masses. in the case of low-mass (≲8 m⊙) protostars, strong observational evidence exists that the launching and collimation is due to the x- and/or disk-wind mechanisms. in these models, it is the protostar/disk system that creates... | zooming into the collimation zone in a massive protostellar jet |
measurements of the extreme ultraviolet (euv) solar spectral irradiance (ssi) are essential for understanding drivers of space weather effects, such as radio blackouts, and aerodynamic drag on satellites during periods of enhanced solar activity. in this paper, we show how to learn a mapping from euv narrowband images ... | a deep learning virtual instrument for monitoring extreme uv solar spectral irradiance |
each solar maximum interval has a different duration and peak activity level, which is reflected in the behavior of key physical variables that characterize solar and solar wind driving and magnetospheric response. the variation in the statistical distributions of the f10.7 index of solar coronal radio emissions, the d... | reproducible aspects of the climate of space weather over the last five solar cycles |
the electron cyclotron maser is the coherent emission process that gives rise to the radio lighthouse effect observed in the hot magnetic chemically peculiar star cu virginis. it has also been proposed to explain the highly circularly polarized radio pulses observed in some ultracool dwarfs with spectral type earlier t... | 3d modelling of stellar auroral radio emission |
the jansky very large array was used to observe 121 magnetic cataclysmic variables (mcvs). we report radio detections of 18 stars. thirteen are new radio sources, increasing the number of mcvs that are radio sources by more than twofold, from 8 to 21. most detections are at 8.7 ghz (x-band) with a lesser number at 5.4 ... | a jansky vla survey of magnetic cataclysmic variable stars. i. the data |
we present a multi-epoch radio study of the taurus-auriga star-forming complex made with the karl g. jansky very large array at frequencies of 4.5 ghz and 7.5 ghz. we detect a total of 610 sources, 59 of which are related to young stellar objects (ysos) and 18 to field stars. the properties of 56% of the young stars ar... | the gould's belt very large array survey. iv. the taurus-auriga complex |
we have carried out the largest and most unbiased search for hypercompact (hc) h ii regions. our method combines four interferometric radio continuum surveys (thor, cornish, magpis, and white2005) with far-infrared and sub-mm galactic plane surveys to identify embedded h ii regions with positive spectral indices; 120 p... | a search for hypercompact h ii regions in the galactic plane |
hydrogenated nanocrystalline silicon (nc-si : h) films intended for efficient nc-si : h solar cells are usually made at the transition to the nanocrystalline regime using the plasma-enhanced chemical vapor deposition (pecvd) process. this change occurs within a sensitive process window and is affected by various deposi... | plasma diagnostic approach for high rate nanocrystalline si synthesis in rf/uhf hybrid plasmas using a pecvd process |
a detailed analysis of reuven ramaty high energy solar spectroscopic imager (rhessi) terrestrial gamma ray flashes (tgfs) is performed in association with world wide lightning location network (wwlln) sources and very low frequency (vlf) sferics recorded at duke university. rhessi clock offset is evaluated and found to... | radio emissions from double rhessi tgfs |
aims: the aim of this work is to constrain properties of the disk around the archetype fu orionis object, fu ori, with as good as 25 au resolution.methods: we resolved fu ori at 29-37 ghz using the karl g. jansky very large array (jvla) in the a-array configuration, which provided the highest possible angular resolutio... | a concordant scenario to explain fu orionis from deep centimeter and millimeter interferometric observations |
there have been several recent detections of candidate keplerian discs around massive young protostars. given the relatively large disc-to-star mass ratios in these systems, and their young ages, it is worth investigating their propensity to becoming self-gravitating. to this end, we compute self-consistent, semi-analy... | self-gravitating disc candidates around massive young stars |
context. formaldehyde (h2co) is a reliable tracer to accurately measure the physical parameters of dense gas in star-forming regions. aim. we aim to determine directly the kinetic temperature and spatial density with formaldehyde for the 100 brightest atlasgal-selected clumps (the top100 sample) at 870 μm representing ... | atlasgal-selected massive clumps in the inner galaxy. vi. kinetic temperature and spatial density measured with formaldehyde |
in this study, znxcd1-xs/cdte solar cells were fabricated on commercially available indium tin oxide (in2o3: sn or ito) and fluorine doped tin oxide (sno2: f or fto) soda-lime glass (slg) substrates by rf magnetron sputtering. thin znxcd1-xs window layers with lower zinc (zn) content in comparison to cadmium (cd) were ... | growth optimization of znxcd1-xs films on ito and fto coated glass for alternative buffer application in cdte thin film solar cells |
the carousel model of pulsar emission attributes the phenomenon of subpulse drifting to a set of discrete sparks located very near the stellar surface rotating around the magnetic axis. here, we investigate the subpulse drifting behavior of psr b0031-07 in the context of the carousel model. we show that b0031-07's thre... | the frequency-dependent behavior of subpulse drifting. i. carousel geometry and emission heights of psr b0031-07 |
we report the discovery of an ultra-luminous quasar j030642.51+185315.8 (hereafter j0306+1853) at redshift 5.363, which hosts a supermassive black hole with {m}{bh}=(1.07+/- 0.27)× {10}10 {m}⊙ . with an absolute magnitude {m}1450=-28.92 and a bolometric luminosity {l}{bol}∼ 3.4× {10}14{l}⊙ , j0306+1853 is one of the mo... | an ultra-luminous quasar at z = 5.363 with a ten billion solar mass black hole and a metal-rich dla at z ∼ 5 |
quiet sun meterwave emission arises from thermal bremsstrahlung in the mk corona, and can potentially be a rich source of coronal diagnostics. on its way to the observer, it gets modified substantially due to propagation effects—primarily refraction and scattering—through the magnetized and turbulent coronal medium, le... | propagation effects in quiet sun observations at meter wavelengths |
it is believed that the gas accretion onto supermassive black holes is the main process of powering this quasar's luminous emission, which occurs in optical, uv, and x-ray regimes and less frequently in radio waves. the observational fact that only a few percent of quasars are radio-loud is still an unresolved issue co... | caltech-nrao stripe 82 survey (cnss). iv. the birth of radio-loud quasar 013815+00 |
we carried out multiwavelength (0.7-5 cm), multi-epoch (1994-2015) very large array (vla) observations toward the region enclosing the bright far-ir sources fir 3 (hops 370) and fir 4 (hops 108) in omc-2. we report the detection of 10 radio sources, 7 of them identified as young stellar objects. we image a well-collima... | star formation under the outflow: the discovery of a non-thermal jet from omc-2 fir 3 and its relationship to the deeply embedded fir 4 protostar |
electron cyclotron maser emission (ecme) is regarded as a plausible source for coherent radio radiations from solar active regions (e.g., solar radio spikes). in this letter, we present a 2d3v fully kinetic electromagnetic particle-in-cell simulation to investigate the wave excitations and subsequent nonlinear processe... | harmonic maser emissions from electrons with loss-cone distribution in solar active regions |
context. although recent observations and theoretical simulations have pointed out that accretion disks and jets can be essential for the formation of stars with a mass of up to at least 20 m⊙, the processes regulating mass accretion and ejection are still uncertain.aims: the goal of the protostellar outflows at the ea... | protostellar outflows at the earliest stages (poets). iii. h2o masers tracing disk-winds and jets near luminous ysos |
using five-year-monitoring observations, we carried out a blind search for pulses for rotating radio transient (rrat) j0139+33 and psr b0320+39. at the interval ±1.5m of the time corresponding to the source passing through the meridian, we detected 39377 individual pulses for the pulsar b0320+39 and 1013 pulses for rra... | pulse energy distribution for rrat j0139+33 according to observations at the 111 mhz frequency |
we investigate low-density accretion flows onto massive black holes (bhs) with masses of ≳105 ${m}_{\odot }$ orbiting around in the outskirts of their host galaxies, performing 3d hydrodynamical simulations. those wandering bhs are populated via ejection from the galactic nuclei through multibody bh interactions and gr... | hunting for wandering massive black holes |
context. scalar-tensor gravity (stg) theories are well-motivated alternatives to general relativity (gr). one class of stg theories, the damour-esposito-farese (def) gravity, has a massless scalar field with two arbitrary coupling parameters. we are interested in this theory because, despite its simplicity, it predicts... | a new pulsar timing model for scalar-tensor gravity with applications to psr j2222-0137 and pulsar-black hole binaries |
context. recent surveys of the galactic plane in the dust continuum and co emission lines reveal that large (≳50 pc) and massive (≳105 m⊙) filaments, know as giant molecular filaments (gmfs), may be linked to galactic dynamics and trace the mid-plane of the gravitational potential in the milky way. yet our physical und... | dense gas in a giant molecular filament |
the proper motions of a source obtained at different epochs or in different spectral regions should in principle be consistent. however, in the case of a binary source or a source with associated ejecta, they could be different depending on the epochs when the observations were made and on what emission is traced in ea... | radio proper motions of the nearby ultra-cool dwarf binary vhs 1256$-$1257ab |
saturn kilometric radiation (skr) is an auroral radio emission which can be detected quasi-continuously by the cassini spacecraft. it has been shown to respond to magnetotail reconnection and to changes in solar wind conditions and thus offers the potential to be used as a remote proxy for magnetospheric dynamics. this... | low-frequency extensions of the saturn kilometric radiation as a proxy for magnetospheric dynamics |
we have been conducting the giant metrewave radio telescope high resolution southern sky (ghrss) survey for the last four years and have discovered 18 pulsars to date. the ghrss survey is an off-galactic-plane survey at 322 mhz in a region of the sky (decl. range -40° to -54°) complementary to other ongoing low-frequen... | the gmrt high-resolution southern sky survey for pulsars and transients. ii. new discoveries, timing, and polarization properties |
we report the discovery of a 1° scale x-ray plume in the northern galactic center (gc) region observed with suzaku. the plume is located at (l, b) ∼ (0.°2, 0.°6), east of the radio lobe reported by previous studies. no significant x-ray excesses are found inside or to the west of the radio lobe. the spectrum of the plu... | x-ray observation of a magnetized hot gas outflow in the galactic center region |
we report a discovery of a z = 4.72 radio galaxy, hsc j083913.17+011308.1, using the lyman break technique with the hyper suprime-cam subaru strategic survey (hsc-ssp) catalog for very large array faint images of the radio sky at twenty centimeter radio sources. the number of known high-z radio galaxies (hzrgs) at z &g... | a wide and deep exploration of radio galaxies with subaru hsc (wergs). iii. discovery of a z = 4.72 radio galaxy with the lyman break technique |
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