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magnetohydrodynamic turbulence regulates the transfer of energy from large to small scales in many astrophysical systems, including the solar atmosphere. we perform three-dimensional magnetohydrodynamic simulations with unprecedentedly large magnetic reynolds number to reveal how rapid reconnection of magnetic field li... | reconnection-driven energy cascade in magnetohydrodynamic turbulence |
the event horizon telescope (eht) collaboration's image of the compact object at the galactic center is the first direct evidence of the supermassive black hole (bh) sgr a*. the shadow of sgr a* has an angular diameter d sh = 48.7 ± 7 μas with fractional deviation from the schwarzschild bh shadow diameter $\delta =-{0.... | tests of loop quantum gravity from the event horizon telescope results of sgr a* |
context. the intriguing binary ls v +22 25 (lb-1) has drawn much attention following claims of it being a single-lined spectroscopic binary with a 79-day orbit comprising a b-type star and a ≈70 m⊙ black hole - the most massive stellar black hole reported to date. subsequent studies demonstrated a lack of evidence for ... | the "hidden" companion in lb-1 unveiled by spectral disentangling |
we report the detection of repeat bursts from the source of frb 171019, one of the brightest fast radio bursts (frbs) detected in the australian square kilometre array pathfinder (askap) fly’s eye survey. two bursts from the source were detected with the green bank telescope in observations centered at 820 mhz. the rep... | faint repetitions from a bright fast radio burst source |
hypothetical ultralight bosonic fields will spontaneously form macroscopic bosonic halos around kerr black holes, via superradiance, transferring part of the mass and angular momentum of the black hole into the halo. such a process, however, is only efficient if resonant—when the compton wavelength of the field approxi... | eht constraint on the ultralight scalar hair of the m87 supermassive black hole |
we present a critical review of the determination of fundamental parameters of white dwarfs discovered by the gaia mission. we first reinterpret color-magnitude and color-color diagrams using photometric and spectroscopic information contained in the montreal white dwarf database (mwdd), combined with synthetic magnitu... | on the measurement of fundamental parameters of white dwarfs in the gaia era |
we present measurements of the growth rate of cosmological structure from the modelling of the anisotropic galaxy clustering measured in the final data release of the vipers survey. the analysis is carried out in configuration space and based on measurements of the first two even multipole moments of the anisotropic ga... | the vimos public extragalactic redshift survey (vipers). the growth of structure at 0.5 < z < 1.2 from redshift-space distortions in the clustering of the pdr-2 final sample |
the totem collaboration has measured the proton-proton total cross section at $\sqrt{s}=13$ tev with a luminosity-independent method. using dedicated $\beta^{*}=90$ m beam optics, the roman pots were inserted very close to the beam. the inelastic scattering rate has been measured by the t1 and t2 telescopes during the ... | first measurement of elastic, inelastic and total cross-section at $\\sqrt{s}=13$ tev by totem and overview of cross-section data at lhc energies |
context. the event horizon telescope (eht) collaboration recently obtained the first images of the surroundings of the supermassive compact object m87* at the center of the galaxy m87. this provides a fascinating probe of the properties of matter and radiation in strong gravitational fields. it is important to determin... | geometric modeling of m87* as a kerr black hole or a non-kerr compact object |
we measure the redshift-space correlation function from a spectroscopic sample of 2783 emission line galaxies from the fastsound survey. the survey, which uses the subaru telescope and covers a redshift range of 1.19 < z < 1.55, is the first cosmological study at such high redshifts. we detect clear anisotropy du... | the subaru fmos galaxy redshift survey (fastsound). iv. new constraint on gravity theory from redshift space distortions at z ∼ 1.4 |
we present high signal-to-noise galaxy-galaxy lensing measurements of the baryon oscillation spectroscopic survey constant mass (cmass) sample using 250 deg2 of weak-lensing data from canada-france-hawaii telescope lensing survey and canada-france-hawaii telescope stripe 82 survey. we compare this signal with predictio... | lensing is low: cosmology, galaxy formation or new physics? |
we report on the masses (mwd), effective temperatures ($\rm{t_\mathrm{eff}}$), and secular mean accretion rates ($\langle \dot{m} \rangle$) of 43 cataclysmic variable (cv) white dwarfs, 42 of which were obtained from the combined analysis of their hubble space telescope ultraviolet data with the parallaxes provided by ... | constraining the evolution of cataclysmic variables via the masses and accretion rates of their underlying white dwarfs |
results of the initial calibration of the ultra-violet imaging telescope (uvit) were reported earlier by tandon et al. the results reported earlier were based on the ground calibration as well as the first observations in orbit. some additional data from the ground calibration and data from more in-orbit observations h... | additional calibration of the ultraviolet imaging telescope on board astrosat |
we present a detailed elemental abundance study of 90 f and g dwarf, turn-off, and subgiant stars in the galactic bulge. based on high-resolution spectra acquired during gravitational microlensing events, stellar ages and abundances for 11 elements (na, mg, al, si, ca, ti, cr, fe, zn, y and ba) have been determined. fo... | chemical evolution of the galactic bulge as traced by microlensed dwarf and subgiant stars. vi. age and abundance structure of the stellar populations in the central sub-kpc of the milky way |
we present two-temperature, radiative general relativistic magnetohydrodynamic simulations of magnetically arrested discs (mad) that launch powerful relativistic jets. the mass accretion rates of our simulations are scaled to match the luminosity of the accretion flow around the supermassive black hole in m87. we consi... | two-temperature, magnetically arrested disc simulations of the jet from the supermassive black hole in m87 |
we report on the search for spectral irregularities induced by oscillations between photons and axionlike-particles (alps) in the γ -ray spectrum of ngc 1275, the central galaxy of the perseus cluster. using 6 years of fermi large area telescope data, we find no evidence for alps and exclude couplings above 5 ×10-12 ge... | search for spectral irregularities due to photon-axionlike-particle oscillations with the fermi large area telescope |
the gravitationally lensed star whl 0137-ls, nicknamed earendel, was identified with a photometric redshift z phot = 6.2 ± 0.1 based on images taken with the hubble space telescope. here we present james webb space telescope (jwst) near infrared camera images of earendel in eight filters spanning 0.8-5.0 μm. in these h... | jwst imaging of earendel, the extremely magnified star at redshift z = 6.2 |
spicules are rapidly evolving fine-scale jets of magnetized plasma in the solar chromosphere. it remains unclear how these prevalent jets originate from the solar surface and what role they play in heating the solar atmosphere. using the goode solar telescope at the big bear solar observatory, we observed spicules emer... | generation of solar spicules and subsequent atmospheric heating |
the national science foundation's daniel k. inouye solar telescope (dkist) will revolutionize our ability to measure, understand, and model the basic physical processes that control the structure and dynamics of the sun and its atmosphere. the first-light dkist images, released publicly on 29 january 2020, only hint at... | critical science plan for the daniel k. inouye solar telescope (dkist) |
current cherenkov telescopes have identified a population of ultra-high-frequency peaked bl lac objects (uhbls), also known as extreme blazars, that exhibit exceptionally hard tev spectra, including 1es 0229+200, 1es 0347-121, rgb j0710+591, 1es 1101-232, and 1es 1218+304. although one-zone synchrotron-self-compton (ss... | a hadronic origin for ultra-high-frequency-peaked bl lac objects |
the advanced space-based solar observatory (aso-s) is a mission proposed for the 25th solar maximum by the chinese solar community. the scientific objectives are to study the relationships between the solar magnetic field, solar flares and coronal mass ejections (cmes). three payloads are deployed: the full-disk vector... | advanced space-based solar observatory (aso-s): an overview |
we describe a dynamic science portal called the growth marshal that allows time-domain astronomers to define science programs; program filters to save sources from different discovery streams; coordinate follow-up with various robotic or classical telescopes; analyze the panchromatic follow-up data; and generate summar... | the growth marshal: a dynamic science portal for time-domain astronomy |
we investigate the relation between star formation rate (sfr) and stellar mass (m), i.e., the main sequence (ms) relation of star-forming galaxies, at 1.3≤slant z< 6 in the first four hubble space telescope (hst) frontier fields, on the basis of rest-frame uv observations. gravitational lensing combined with deep hs... | the star formation main sequence in the hubble space telescope frontier fields |
we give an overview of the grism lens amplified survey from space (glass), a large hubble space telescope program aimed at obtaining grism spectroscopy of the fields of 10 massive clusters of galaxies at redshift z = 0.308-0.686, including the hubble frontier fields (hff). the wide field camera 3 (wfc3) yields near-inf... | the grism lens-amplified survey from space (glass). i. survey overview and first data release |
we have conducted a two-layered spectroscopic survey (1' × 1' ultra deep and 3' × 3' deep regions) in the hubble ultra deep field (hudf) with the multi unit spectroscopic explorer (muse). the combination of a large field of view, high sensitivity, and wide wavelength coverage provides an order of magnitude improvement ... | the muse hubble ultra deep field survey. ii. spectroscopic redshifts and comparisons to color selections of high-redshift galaxies |
the advent of the james webb space telescope (jwst) signals a new era in exploring galaxies in the high-z universe. current and upcoming jwst imaging will potentially detect galaxies at z ~ 20, creating a new urgency in the quest to infer accurate photometric redshifts (photo-z) for individual galaxies from their spect... | inferring more from less: prospector as a photometric redshift engine in the era of jwst |
the immediate vicinity of an active supermassive black hole—with its event horizon, photon ring, accretion disk and relativistic jets—is an appropriate place to study physics under extreme conditions, particularly general relativity and magnetohydrodynamics. observing the dynamics of such compact astrophysical objects ... | variable structures in m87* from space, time and frequency resolved interferometry |
we present a catalog of 182 galaxy clusters detected through the sunyaev-zel’dovich (sz) effect by the atacama cosmology telescope in a contiguous 987.5 deg2 field. the clusters were detected as sz decrements by applying a matched filter to 148 ghz maps that combine the original act equatorial survey with data from the... | the atacama cosmology telescope: the two-season actpol sunyaev-zel’dovich effect selected cluster catalog |
we study gravitational lensing in strong-field limit by a static spherically symmetric black hole in quartic scalar field horndeski gravity having additional hair parameter q, evading the no-hair theorem. we find an increase in the deflection angle αd, photon sphere radius xps, and angular position θ∞ that increases mo... | investigating strong gravitational lensing effects by supermassive black holes with horndeski gravity |
the γ -metric is a static, axially-symmetric singular solution of the vacuum einstein's equations without an event horizon. this is a two-parameter family of solutions, generic values of one of which (called γ ) measure the deviation from spherical symmetry. we show that this can serve as a black hole mimicker, consist... | shadows and thin accretion disk images of the γ -metric |
we present the first linear polarization measurements from the 2015 long-duration balloon flight of spider, which is an experiment that is designed to map the polarization of the cosmic microwave background (cmb) on degree angular scales. the results from these measurements include maps and angular power spectra from o... | a constraint on primordial b-modes from the first flight of the spider balloon-borne telescope |
the photometric lsst astronomical time series classification challenge (plasticc) is an open data challenge to classify simulated astronomical time-series data in preparation for observations from the large synoptic survey telescope (lsst), which will achieve first light in 2019 and commence its 10-year main survey in ... | the photometric lsst astronomical time-series classification challenge (plasticc): data set |
the galactic archaeology with hermes (galah) survey is a massive observational project to trace the milky way's history of star formation, chemical enrichment, stellar migration and minor mergers. using high-resolution (r ≃ 28 000) spectra, taken with the high efficiency and resolution multi-element spectrograph (herme... | the galah survey: observational overview and gaia dr1 companion |
the x-ray integral field unit (x-ifu) is the high resolution x-ray spectrometer of the esa athena x-ray observatory. over a field of view of 5' equivalent diameter, it will deliver x-ray spectra from 0.2 to 12 kev with a spectral resolution of 2.5 ev up to 7 kev on ∼ 5" pixels. the x-ifu is based on a large format arra... | the athena x-ray integral field unit (x-ifu) |
the event horizon telescope (eht) has led to the first images of a supermassive black hole, revealing the central compact objects in the elliptical galaxy m87 and the milky way. proposed upgrades to this array through the next-generation eht (ngeht) program would sharply improve the angular resolution, dynamic range, a... | key science goals for the next-generation event horizon telescope |
heavy nearly-sterile neutrinos are a common ingredient in extensions of the standard model which aim to explain neutrino masses, like for instance in type i seesaw models, or one of its variants. if the scale of the new heavy neutral leptons (hnls) is sufficiently low, observable signatures can arise in a range of curr... | heavy neutral leptons from low-scale seesaws at the dune near detector |
context. yebes 40 m radio telescope is the main and largest observing instrument at yebes observatory and is devoted to very long baseline interferometry (vlbi) and single-dish observations since 2010. it has been covering frequency bands between 2 ghz and 90 ghz in discontinuous and narrow windows in most cases in ord... | yebes 40 m radio telescope and the broad band nanocosmos receivers at 7 mm and 3 mm for line surveys |
recently, several telescopes, including swift-bat, gbm, and lhaaso, have observed the ever highest-energy and long-duration gamma-rays from a gamma-ray burst named as grb221009a (located at a red-shift of $z=0.151$) on october 9, 2022. conventional understanding tells us that very high-energy photons produced at such a... | the role of a heavy neutrino in the gamma-ray burst grb-221009a |
we report on the first observation of the diffuse cosmic neutrino flux with the baikal-gvd neutrino telescope. using cascadelike events collected by baikal-gvd in 2018-2021, a significant excess of events over the expected atmospheric background is observed. this excess is consistent with the high-energy diffuse cosmic... | diffuse neutrino flux measurements with the baikal-gvd neutrino telescope |
the icy surface of jupiter's moon, europa, is thought to lie on top of a global ocean1-4. signatures in some hubble space telescope images have been associated with putative water plumes rising above europa's surface5,6, providing support for the ocean theory. however, all telescopic detections reported were made at th... | evidence of a plume on europa from galileo magnetic and plasma wave signatures |
we present photometry and spectroscopy for 27 pulsating hydrogen-atmosphere white dwarfs (davs; a.k.a. zz ceti stars) observed by the kepler space telescope up to k2 campaign 8, an extensive compilation of observations with unprecedented duration (>75 days) and duty cycle (>90%). the space-based photometry reveal... | white dwarf rotation as a function of mass and a dichotomy of mode line widths: kepler observations of 27 pulsating da white dwarfs through k2 campaign 8 |
the role of galaxy mergers in fuelling active galactic nuclei (agns) is still debated, owing partly to selection effects inherent to studies of the merger/agn connection. in particular, luminous agns are often obscured in late-stage mergers. mid-infrared (ir) colour selection of dust-enshrouded agn with, e.g. the wide-... | the power of infrared agn selection in mergers: a theoretical study |
the luminosity function of fast radio bursts (frbs), defined as the event rate per unit cosmic co-moving volume per unit luminosity, may help to reveal the possible origins of frbs and design the optimal searching strategy. with the bayesian modelling, we measure the frb luminosity function using 46 known frbs. our bay... | on the frb luminosity function - - ii. event rate density |
state-of-the-art earth system models typically employ grid spacings of o(100 km), which is too coarse to explicitly resolve main drivers of the flow of energy and matter across the earth system. in this paper, we present the new icon-sapphire model configuration, which targets a representation of the components of the ... | icon-sapphire: simulating the components of the earth system and their interactions at kilometer and subkilometer scales |
we present the confusion-limited 1.28 ghz meerkat deep2 image covering one {θ }{{b}}≈ 68\prime {fwhm} primary-beam area with θ = 7.″6 fwhm resolution and {σ }n=0.55+/- 0.01 μ {jy} {beam}}-1 rms noise. its j2000 center position α = 04h 13m 26.ˢ4, δ = -80° 00‧ 00″ was selected to minimize artifacts caused by bright sourc... | the 1.28 ghz meerkat deep2 image |
we present a spectroscopic redshift measurement of a very bright lyman break galaxy at z=7.7302+/- 0.0006 using the keck/multi-object spectrometer for infra-red exploration. the source was pre-selected photometrically in the egs field as a robust z ∼ 8 candidate with h = 25.0 mag based on optical non-detections and a v... | a spectroscopic redshift measurement for a luminous lyman break galaxy at z = 7.730 using keck/mosfire |
in recent years, unprecedented progress has been achieved regarding black holes' observation through the electromagnetic channel. the images of the supermassive black holes m87* and sgr a* released by the event horizon telescope (eht) collaboration provided direct visual evidence for their existence, which has stimulat... | black hole images: a review |
the fermi large area telescope (lat) lightcurve repository (lcr) is a publicly available, continually updated library of gamma-ray lightcurves of variable fermi-lat sources generated over multiple timescales. the fermi-lat lcr aims to provide publication-quality lightcurves binned on timescales of 3, 7, and 30 days for... | the fermi-lat lightcurve repository |
we present the galaxy shear catalog that will be used for the three-year cosmological weak gravitational lensing analyses using data from the wide layer of the hyper suprime-cam (hsc) subaru strategic program (ssp) survey. the galaxy shapes are measured from the i-band imaging data acquired from 2014 to 2019 and calibr... | the three-year shear catalog of the subaru hyper suprime-cam ssp survey |
the bright bl lac object txs 0506+056 is the most likely counterpart of the icecube neutrino event ehe 170922a. the lack of this redshift prevents a comprehensive understanding of the modeling of the source. we present high signal-to-noise optical spectroscopy, in the range 4100-9000 å, obtained at the 10.4 m gran tele... | the redshift of the bl lac object txs 0506+056 |
we report the discovery of three large ({r}29 ≳ 1‧) extremely low surface brightness (lsb; {μ }v,0≈ 27.0) galaxies identified using our deep, wide-field imaging of the virgo cluster from the burrell schmidt telescope. complementary data from the next generation virgo cluster survey do not resolve red giant branch stars... | galaxies at the extremes: ultra-diffuse galaxies in the virgo cluster |
with high spatial resolution, polarimetric imaging of a supermassive black hole, like m 87⋆ or sgr a⋆ , by the event horizon telescope can be used to probe the existence of ultralight bosonic particles, such as axions. such particles can accumulate around a rotating black hole through the superradiance mechanism, formi... | probing axions with event horizon telescope polarimetric measurements |
in this paper, we present the astrophotometric catalogues of 56 globular clusters and one open cluster. astrometry and photometry are mainly based on images collected within the `hst legacy survey of galactic globular clusters: shedding uv light on their populations and formation' (go-13297, pi: piotto), and the `acs s... | the hubble space telescope uv legacy survey of galactic globular clusters - xvii. public catalogue release |
we present laboratory rotational spectroscopy of five isomers of cyanoindene (2-, 4-, 5-, 6-, and 7-cyanoindene) using a cavity fourier transform microwave spectrometer operating between 6 and 40 ghz. based on these measurements, we report the detection of 2-cyanoindene (1h-indene-2-carbonitrile; 2- ${{\rm{c}}}_{9}{{\r... | discovery of interstellar 2-cyanoindene (2-c9h7cn) in gotham observations of tmc-1 |
we studied lyman-α (lyα) escape in a statistical sample of 43 green peas with hst/cos lyα spectra. green peas are nearby star-forming galaxies with strong [o iii]λ5007 emission lines. our sample is four times larger than the previous sample and covers a much more complete range of green pea properties. we found that ab... | lyα profile, dust, and prediction of lyα escape fraction in green pea galaxies |
forty years ago, it was proposed that gas-phase organic chemistry in the interstellar medium can be initiated by the methyl cation ch3+ (refs. 1-3), but so far it has not been observed outside the solar system4,5. alternative routes involving processes on grain surfaces have been invoked6,7. here we report james webb s... | formation of the methyl cation by photochemistry in a protoplanetary disk |
vandels is a uniquely deep spectroscopic survey of high-redshift galaxies with the vimos spectrograph on eso's very large telescope (vlt). the survey has obtained ultradeep optical (0.48 < λ < 1.0 μ m) spectroscopy of ≃2100 galaxies within the redshift interval 1.0 ≤ z ≤ 7.0, over a total area of ≃0.2 deg2 centre... | the vandels eso public spectroscopic survey |
mirrors are used in telescopes, microscopes, photo cameras, lasers, satellite dishes, and everywhere else, where redirection of electromagnetic radiation is required making them arguably the most important optical component. while conventional isotropic mirrors will reflect linear polarizations without change, the hand... | chiral mirrors |
the afterglow of the binary neutron-star merger gw1708171 gave evidence for a structured relativistic jet2-6 and a link3,7,8 between such mergers and short gamma-ray bursts. superluminal motion, found using radio very long baseline interferometry3 (vlbi), together with the afterglow light curve provided constraints on ... | optical superluminal motion measurement in the neutron-star merger gw170817 |
we present a procedure to generally constrain the environments of neutrino-producing sites in photomeson production models of jetted active galactic nuclei (agns) where any origin of the dominant target photon field can be accommodated. for this purpose we reconstruct the minimum target photon spectrum required to prod... | cascading constraints from neutrino-emitting blazars: the case of txs 0506+056 |
in situ measurements of the solar wind have been available for almost 60 years, and in that time plasma physics simulation capabilities have commenced and ground-based solar observations have expanded into space-based solar observations. these observations and simulations have yielded an increasingly improved knowledge... | nine outstanding questions of solar wind physics |
in the era of the ska precursors, telescopes are producing deeper, larger images of the sky on increasingly small time-scales. the greater size and volume of images place an increased demand on the software that we use to create catalogues, and so our source finding algorithms need to evolve accordingly. in this paper,... | source finding in the era of the ska (precursors): aegean 2.0 |
we present measurements of secondary cosmic microwave background (cmb) anisotropies and cosmic infrared background (cib) fluctuations using data from the south pole telescope (spt) covering the complete 2540 deg2 spt-sz survey area. data in the three spt-sz frequency bands centered at 95, 150, and 220 ghz, are used to ... | a measurement of secondary cosmic microwave background anisotropies from the 2500 square-degree spt-sz survey |
photometric redshifts are essential in studies of both galaxy evolution and cosmology, as they enable analyses of objects too numerous or faint for spectroscopy. the rubin observatory, euclid, and roman space telescope will soon provide a new generation of imaging surveys with unprecedented area coverage, wavelength ra... | photometric redshifts for next-generation surveys |
the international lofar telescope is an interferometer with stations spread across europe. with baselines of up to ~2000 km, lofar has the unique capability of achieving sub-arcsecond resolution at frequencies below 200 mhz. however, it is technically and logistically challenging to process lofar data at this resolutio... | sub-arcsecond imaging with the international lofar telescope. i. foundational calibration strategy and pipeline |
we present an original phenomenological model to describe the evolution of galaxy number counts, morphologies, and spectral energy distributions across a wide range of redshifts (0.2< z< 15) and stellar masses [{log}(m/{m}⊙ )≥slant 6]. our model follows observed mass and luminosity functions of both star-forming ... | the jwst extragalactic mock catalog: modeling galaxy populations from the uv through the near-ir over 13 billion years of cosmic history |
the first jwst data revealed an unexpected population of red galaxies that appear to have redshifts of z ~ 7-9 and high masses of m * ≳ 1010 m ☉. here we fit sérsic profiles to the f200w nircam images of the 13 massive galaxy candidates of labbé et al., to determine their structural parameters. satisfactory fits were o... | sizes and mass profiles of candidate massive galaxies discovered by jwst at 7 < z < 9: evidence for very early formation of the central 100 pc of present-day ellipticals |
we present the 0.6 < z < 2.6 evolution of the ionized gas velocity dispersion in 175 star-forming disk galaxies based on data from the full kmos3d integral field spectroscopic survey. in a forward-modeling bayesian framework including instrumental effects and beam-smearing, we fit simultaneously the observed gala... | the evolution and origin of ionized gas velocity dispersion from z ∼ 2.6 to z ∼ 0.6 with kmos3d |
radial mass-to-light ratio gradients cause the half-mass and half-light radii of galaxies to differ, potentially biasing studies that use half-light radii. here we present the largest catalog to date of galaxy half-mass radii at z > 1: 7006 galaxies in the candels fields at 1.0 ≤ z ≤ 2.5. the sample includes both st... | half-mass radii for ∼7000 galaxies at 1.0 ≤ z ≤ 2.5: most of the evolution in the mass-size relation is due to color gradients |
we present the results from a spectroscopic survey using the mosfire near-infrared spectrograph on the 10 m keck telescope to search for lyα emission from candidate galaxies at z ~ 9-10 in four of the candels fields (goods-n, egs, uds, and cosmos). we observed 11 target galaxies, detecting lyα from one object in ~8.1 h... | searching for islands of reionization: a potential ionized bubble powered by a spectroscopic overdensity at z = 8.7 |
motivated by the recent study about the extended uncertainty principle (eup) black holes, we present in this study its extension called the generalized extended uncertainty principle (geup) black holes. in particular, we investigated the geup effects on astrophysical and quantum black holes. first, we derive the expres... | generalized extended uncertainty principle black holes: shadow and lensing in the macro- and microscopic realms |
we present results from a set of simulations designed to constrain the weak lensing shear calibration for the hyper suprime-cam (hsc) survey. these simulations include hsc observing conditions and galaxy images from the hubble space telescope (hst), with fully realistic galaxy morphologies and the impact of nearby gala... | weak lensing shear calibration with simulations of the hsc survey |
the recent observation of the shadow of the supermassive compact object m87* by the event horizon telescope (eht) collaboration has opened up a new window to probe the strong gravity regime. in this paper, we study shadows cast by two viable alternatives to the kerr black hole, and compare them with the shadow of m87*.... | constraining alternatives to the kerr black hole |
context. hr 6819 was recently proposed to be a triple system consisting of an inner b-type giant plus black hole (bh) binary with an orbital period of 40 d and an outer be tertiary. this interpretation is mainly based on two inferences: that the emission attributed to the outer be star is stationary and that the inner ... | is hr 6819 a triple system containing a black hole?. an alternative explanation |
we present new three-dimensional (3d) interstellar dust reddening maps of the galactic plane in three colours, e(g - ks), e(gbp - grp), and e(h - ks). the maps have a spatial angular resolution of 6 arcmin and covers over 7000 deg2 of the galactic plane for galactic longitude 0° < l < 360° and latitude |b| < 1... | three-dimensional interstellar dust reddening maps of the galactic plane |
we describe an algorithm for application of the classic "drizzle" technique to produce 3d spectral cubes using data obtained from the slicer-type integral field unit (ifu) spectrometers on board the james webb space telescope. this algorithm relies upon the computation of overlapping volume elements (composed of two sp... | a 3d drizzle algorithm for jwst and practical application to the miri medium resolution spectrometer |
we critically examine the ability of future neutrino telescopes, including baikal-gvd, km3net, p-one, tambo, and icecube-gen2, to determine the flavor composition of high-energy astrophysical neutrinos in light of data from next-generation of neutrino oscillation experiments including juno, dune, and hyper-kamiokande. ... | the future of high-energy astrophysical neutrino flavor measurements |
low-frequency quasiperiodic oscillations (lfqpos) are commonly found in black hole x-ray binaries, and their origin is still under debate. the properties of lfqpos at high energies (above 30 kev) are closely related to the nature of the accretion flow in the innermost regions, and thus play a crucial role in critically... | discovery of oscillations above 200 kev in a black hole x-ray binary with insight-hxmt |
we investigate the precessing and periodic orbits of a test timelike particle around the black-bounce-reissner-nordström spacetime which is characterized by its charge and bounce parameter. its marginally bound orbit and innermost stable circular orbit are obtained in the exact forms. we pay closely attention to its pr... | probing a black-bounce-reissner-nordström spacetime with precessing and periodic motion |
we present a new determination of the galaxy stellar-mass function (gsmf) over the redshift interval 0.25 ≤ z ≤ 3.75, derived from a combination of ground-based and hubble space telescope (hst) imaging surveys. based on a near-ir-selected galaxy sample selected over a raw survey area of 3 deg2 and spanning ≥4 dex in st... | the evolution of the galaxy stellar-mass function over the last 12 billion years from a combination of ground-based and hst surveys |
we study the strong gravitational lensing effect around rotating black holes in different gravity theories. by calculating the deflection angle of strong gravitational lensing, we evaluate the lensing observables including the image position, separation, magnification, and the time delays between the relativistic image... | constraining a modified gravity theory in strong gravitational lensing and black hole shadow observations |
the zwicky transient facility (ztf) survey generates real-time alerts for optical transients, variables, and moving objects discovered in its wide-field survey. we describe the ztf alert stream distribution and processing (filtering) system. the system uses existing open-source technologies developed in industry: kafka... | the zwicky transient facility alert distribution system |
we use deep hubble space telescope imaging of the frontier fields to accurately measure the galaxy rest-frame ultraviolet luminosity function (uv lf) in the redshift range z ∼ 6-8. we combine observations in three lensing clusters, a2744, macs 0416, and macs 0717, and their associated parallel fields to select high-red... | are ultra-faint galaxies at z = 6-8 responsible for cosmic reionization? combined constraints from the hubble frontier fields clusters and parallels |
we investigate the morphology and physical properties of a sample of 22 ir-selected dusty star-forming galaxies at cosmic noon (z ~ 2), using james webb space telescope nircam images obtained in the egs field for the cosmic evolution early release science survey. the exceptional resolution of the nircam images allows u... | jwst/ceers sheds light on dusty star-forming galaxies: forming bulges, lopsidedness and outside-in quenching at cosmic noon |
the event horizon telescope (eht) observation unveiled the first image of supermassive black hole sgr a* showing a shadow of diameter θ sh = 48.7 ± 7 μas with fractional deviation from the schwarzschild black hole shadow diameter $\delta =-{0.08}_{-0.09}^{+0.09}\,(\mathrm{vlti}),-{0.04}_{-0.10}^{+0.09}\,(\mathrm{keck})... | testing rotating regular metrics with eht results of sgr a* |
observations from the james webb space telescope (jwst) have unveiled several galaxies with stellar mass $m_*\gtrsim10^{10} m_\odot$ at $7.4\lesssim z\lesssim 9.1$. these remarkable findings indicate an unexpectedly high stellar mass density, which contradicts the prediction of the $\lambda \rm cdm$ model. we adopt the... | exploring the dark energy equation of state with jwst |
we report the detection and interferometric localization of the repeating fast radio burst (frb) source frb 20220912a during commissioning observations with the deep synoptic array (dsa-110). two bursts were detected from frb 20220912a, one each on 2022 october 18 and 2022 october 25. the best-fit position is (r.a. j20... | deep synoptic array science: discovery of the host galaxy of frb 20220912a |
this paper describes the second public data release (dr2) of the calar alto legacy integral field area (califa) survey. the data for 200 objects are made public, including the 100 galaxies of the first public data release (dr1). data were obtained with the integral-field spectrograph pmas/ppak mounted on the 3.5 m tele... | califa, the calar alto legacy integral field area survey. iii. second public data release |
in the lower solar atmosphere, the chromosphere is permeated by jets known as spicules, in which plasma is propelled at speeds of 50 to 150 kilometers per second into the corona. the origin of the spicules is poorly understood, although they are expected to play a role in heating the million-degree corona and are assoc... | on the generation of solar spicules and alfvénic waves |
aims: the purpose of this work is to evaluate how several elements produced by different nucleosynthesis processes behave with stellar age and provide empirical relations to derive stellar ages from chemical abundances.methods: we derived different sets of ages using padova and yonsei-yale isochrones and hipparcos and ... | abundance to age ratios in the harps-gto sample with gaia dr2. chemical clocks for a range of [fe/h] |
we present the first observational evidence that light propagating near a rotating black hole is twisted in phase and carries orbital angular momentum (oam). this physical observable allows a direct measurement of the rotation of the black hole. we extracted the oam spectra from the radio intensity data collected by th... | measurement of the spin of the m87 black hole from its observed twisted light |
the decam local volume exploration survey (delve) is a 126-night survey program on the 4 m blanco telescope at the cerro tololo inter-american observatory in chile. delve seeks to understand the characteristics of faint satellite galaxies and other resolved stellar substructures over a range of environments in the loca... | the decam local volume exploration survey: overview and first data release |
we present the widest-field resolved stellar map to date of the closest (d∼ 3.8 mpc) massive elliptical galaxy ngc 5128 (centaurus a; cen a), extending out to a projected galactocentric radius of ∼150 kpc. the data set is part of our ongoing panoramic imaging survey of centaurus and sculptor (pisces) utilizing the mage... | the extended halo of centaurus a: uncovering satellites, streams, and substructures |
we report a new fast radio burst (frb) discovered in real-time as part of the utmost project at the molonglo observatory synthesis radio telescope. frb170827 was first detected with our low-latency (<24 s) and machine-learning based frb detection system. the frb discovery was accompanied by the capture of voltage da... | frb microstructure revealed by the real-time detection of frb170827 |
we present a 0.4-8 μm multi-wavelength photometric catalog in the extended groth strip (egs) field. this catalog is built on the hubble space telescope (hst) wfc3 and acs data from the cosmic assembly near-infrared deep extragalactic legacy survey (candels), and it incorporates the existing hst data from the all-wavele... | candels multi-wavelength catalogs: source identification and photometry in the candels extended groth strip |
mightee is a galaxy evolution survey using simultaneous radio continuum, spectropolarimetry, and spectral line observations from the south african meerkat telescope. when complete, the survey will image ~20 deg2 over the cosmos, e-cdfs, elais-s1, and xmm-newton large scale structure field (xmm-lss) extragalactic deep f... | mightee: total intensity radio continuum imaging and the cosmos/xmm-lss early science fields |
recently gamma-ray bursts (grbs) have been detected at very-high-energy (vhe) gamma-rays by imaging atmospheric cherenkov telescopes, and a two-component jet model has often been invoked to explain multiwavelength data. in this work, multiwavelength afterglow emission from an extremely bright grb, grb 221009a, is exami... | two-component jet model for multiwavelength afterglow emission of the extremely energetic burst grb 221009a |
using data from jwst, we analyse the compact sources ("sparkles") located around a remarkable z spec = 1.378 galaxy (the 'sparkler) that is strongly gravitationally lensed by the z = 0.39 galaxy cluster smacs j0723.3-7327. several of these compact sources can be cross-identified in multiple images, making it clear that... | the sparkler: evolved high-redshift globular cluster candidates captured by jwst |
the fugin project is one of legacy projects using a new multi-beam forest (four-beam receiver system on the 45 m telescope). this project aims to simultaneously investigate the distribution, kinematics, and physical properties of both diffuse and dense molecular gases in the galaxy by observing 12co, 13co, and c18o j =... | forest unbiased galactic plane imaging survey with the nobeyama 45 m telescope (fugin). i. project overview and initial results |
we present ground-based and swift observations of iptf16fnl, a likely tidal disruption event (tde) discovered by the intermediate palomar transient factory (iptf) survey at 66.6 mpc. the light curve of the object peaked at an absolute mag {m}g=-17.2. the maximum bolometric luminosity (from optical and uv) was {l}p≃ (1.... | iptf16fnl: a faint and fast tidal disruption event in an e+a galaxy |
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