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we discuss 6 ghz jvla observations covering a volume-limited sample of 178 low-redshift (0.2< z< 0.3) optically selected quasi-stellar objects (qsos). our 176 radio detections fall into two clear categories: (1) about 20% are radio-loud qsos (rlqs) with spectral luminosities of {l}6≳ {10}23.2 {{w}} {{hz}}-1 that ... | radio-loud and radio-quiet qsos |
of the almost 40 star-forming galaxies at z≳ 5 (not counting quasi-stellar objects) observed in [cii] to date, nearly half are either very faint in [cii] or not detected at all, and fall well below expectations based on locally derived relations between star formation rate and [cii] luminosity. this has raised question... | sígame simulations of the [cii], [oi], and [oiii] line emission from star-forming galaxies at z≃ 6 |
the identification of bright quasars at z ≳ 6 enables detailed studies of supermassive black holes, massive galaxies, structure formation, and the state of the intergalactic medium within the first billion years after the big bang. we present the spectroscopic confirmation of 55 quasars at redshifts 5.6 < z < 6.5... | the pan-starrs1 z > 5.6 quasar survey. ii. discovery of 55 quasars at 5.6 < z < 6.5 |
we investigate the constraints on the sum of neutrino masses ({{σ }}{m}ν ) using the most recent cosmological data, which combines the distance measurement from baryonic acoustic oscillation in the extended baryon oscillation spectroscopic survey dr14 quasar sample with the power spectra of temperature and polarization... | constraints on the sum of neutrino masses using cosmological data including the latest extended baryon oscillation spectroscopic survey dr14 quasar sample |
we report on ≈0.″35 (≈2kpc) resolution observations of the [c ii] and dust continuum emission from five z > 6 quasar host-companion galaxy pairs obtained with the atacama large millimeter/submillimeter array. the [c ii] emission is resolved in all galaxies, with physical extents of 3.2-5.4 kpc. the dust continuum is... | resolved [c ii] emission from z > 6 quasar host-companion galaxy pairs |
the most frequently proposed model for the origin of quasars holds that the high accretion rates seen in luminous active galactic nuclei (agn) are primarily triggered during major mergers between gas-rich galaxies. while plausible for decades, this model has only begun to be tested with statistical rigor in the past fe... | do the most massive black holes at z = 2 grow via major mergers? |
the presence of massive black holes (bhs) with masses of the order of $10^9\, {\rm m_\odot }$, powering bright quasars when the universe was less than 1 gyr old, poses strong constraints on their formation mechanism. several scenarios have been proposed to date to explain massive bh formation, from the low-mass seed bh... | forming massive seed black holes in high-redshift quasar host progenitors |
davies et al. established that for l* galaxies the fraction of baryons in the circumgalactic medium (cgm) is inversely correlated with the mass of their central supermassive black holes (bhs) in the eagle hydrodynamic simulation. the interpretation is that, over time, a more massive bh has provided more energy to trans... | feedback from supermassive black holes transforms centrals into passive galaxies by ejecting circumgalactic gas |
we study the substructure content of the strong gravitational lens rxj1131-1231 through a forward modelling approach that relies on generating an extensive suite of realistic simulations. we use a semi-analytic merger tree prescription that allows us to stochastically generate substructure populations whose properties ... | lensing substructure quantification in rxj1131-1231: a 2 kev lower bound on dark matter thermal relic mass |
the assembly of the first super massive black holes (smbhs) at z ≳ 6 is still a subject of intense debate. if black holes (bhs) grow at their eddington rate, they must start from ≳104 m⊙ seeds formed by the direct collapse of gas. here, we explore the alternative scenario where ∼100 m⊙ bh remnants of the first stars gr... | super-eddington growth of the first black holes |
the emergence of the first black holes during the first billion years of cosmic history marks a key event in cosmology. their formation is part of the overall process of ending the cosmic dark ages, when the first stars appeared in low-mass dark matter haloes about a few 100 million years after the big bang. the first ... | supermassive black holes in the early universe |
we use the panoramic survey telescope and rapid response system 1 survey (pan-starrs1, ps1) data to extend the sloan digital sky survey (sdss) stripe 82 quasar light curves. combining ps1 and sdss light curves provides a 15 yr baseline for 9248 quasars—5 yr longer than prior studies that used only sdss. we fit the ligh... | improving damped random walk parameters for sdss stripe 82 quasars with pan-starrs1 |
we determine the low-redshift x-ray luminosity function, active black hole mass function (bhmf), and eddington ratio distribution function (erdf) for both unobscured (type 1) and obscured (type 2) active galactic nuclei (agns), using the unprecedented spectroscopic completeness of the bat agn spectroscopic survey (bass... | bass. xxx. distribution functions of dr2 eddington ratios, black hole masses, and x-ray luminosities |
in the sixth of a series of papers reporting on a large reverberation mapping (rm) campaign of active galactic nuclei (agns) with high accretion rates, we present velocity-resolved time lags of hβ emission lines for nine objects observed in the campaign during 2012-2013. in order to correct the line broadening caused b... | supermassive black holes with high accretion rates in active galactic nuclei. vi. velocity-resolved reverberation mapping of the hβ line |
we cross-match the two currently largest all-sky photometric catalogs—mid-infrared wide-field infrared survey explorer and supercosmos scans of ukst/poss-ii photographic plates—to obtain a new galaxy sample that covers 3π steradians. in order to characterize and purify the extragalactic data set, we use external gama a... | wise × supercosmos photometric redshift catalog: 20 million galaxies over 3/pi steradians |
esa recently called for new "science ideas" to be investigated in terms of feasibility and technological developments -- for technologies not yet sufficiently mature. these ideas may in the future become candidates for m or l class missions within the esa science program. with the launch of gaia in december 2013, europ... | gaianir: combining optical and near-infra-red (nir) capabilities with time-delay-integration (tdi) sensors for a future gaia-like mission |
the observed lyman-α flux power spectrum (fps) is suppressed on scales below {∼} 30 {km s}^{-1}. this cut-off could be due to the high temperature, t0, and pressure, p0, of the absorbing gas or, alternatively, it could reflect the free streaming of dark matter particles in the early universe. we perform a set of very h... | the lyman-α forest as a diagnostic of the nature of the dark matter |
using data from the mosfire deep evolution field (mosdef) survey, we present a census of active galactic nucleus (agn)-driven ionized outflows in a sample of 159 agns at 1.4 ≤ z ≤ 3.8. the sample spans agn bolometric luminosities of 1044-47 erg s-1 and includes both quiescent and star-forming galaxies extending across ... | the mosdef survey: a census of agn-driven ionized outflows at z = 1.4-3.8 |
the nanohertz gravitational wave background (gwb) is believed to be dominated by gw emission from supermassive black hole binaries (smbhbs). observations of several dual-active galactic nuclei (agn) strongly suggest a link between agn and smbhbs, given that these dual-agn systems will eventually form bound binary pairs... | a quasar-based supermassive black hole binary population model: implications for the gravitational wave background |
we carried out spectroscopic monitoring of 21 low-redshift seyfert 1 galaxies using the kast double spectrograph on the 3 m shane telescope at lick observatory from 2016 april to 2017 may. targeting active galactic nuclei (agns) with luminosities of λ lλ (5100 å) ≈ 1044 erg s-1 and predicted hβ lags of ~20-30 days or b... | the lick agn monitoring project 2016: velocity-resolved hβ lags in luminous seyfert galaxies |
context. galaxy-wide outflows driven by star formation and/or an active galactic nucleus (agn) are thought to play a crucial rule in the evolution of galaxies and the metal enrichment of the inter-galactic medium. direct measurements of these processes are still scarce and new observations are needed to reveal the natu... | the close agn reference survey (cars). a massive multi-phase outflow impacting the edge-on galaxy he 1353-1917 |
blazars research is one of the hot topics of contemporary extragalactic astrophysics. that is because these sources are the most abundant type of extragalactic γ-ray sources and are suspected to play a central role in multimessenger astrophysics. we have used swift$\_$xrtproc, a tool to carry out an accurate spectral a... | x-ray spectra, light curves and seds of blazars frequently observed by swift |
we study epicyclic oscillatory motion along circular geodesics of the simpson–visser meta-geometry describing in a unique way regular black-bounce black holes and reflection-symmetric wormholes by using a length parameter l. we give the frequencies of the orbital and epicyclic motion in a keplerian disc with inner edge... | epicyclic oscillations around simpson–visser regular black holes and wormholes |
we estimate the amplitude of the nano-hz stochastic gravitational wave background (gwb) resulting from an unresolved population of inspiralling massive black hole binaries (mbhbs). to this aim, we use the l-galaxies semi-analytical model applied on top of the millennium merger trees. the dynamical evolution of mbhbs in... | massive black hole evolution models confronting the n-hz amplitude of the stochastic gravitational wave background |
we survey the highly ionized circumgalactic media (cgm) of 29 blindly selected galaxies at 0.49< {z}gal}< 1.44 based on high signal-to-noise ratio ultraviolet spectra of z ≳ 1 quasi-stellar objects and the galaxy database from the cos absorption survey of baryon harbors (casbah). we detect the ne viii doublet in ... | the cos absorption survey of baryon harbors (casbah): warm-hot circumgalactic gas reservoirs traced by ne viii absorption |
we have detected in alma observations co j=6\to 5 emission from the nucleus of the seyfert galaxy ngc 1068. the low-velocity (up to ±70 km s-1 relative to systemic) co emission resolves into a 12 × 7 pc structure, roughly aligned with the nuclear radio source. higher-velocity emission (up to ±400 km s-1) is consistent ... | high-velocity bipolar molecular emission from an agn torus |
the importance of studying the gaia dr2 parallax zero-point by external means was underlined by the articles that accompanied the release, and initiated by several works making use of cepheids, eclipsing binaries, and asteroseismology. despite a very efficient elimination of basic-angle variations, a small fluctuation ... | new light on the gaia dr2 parallax zero-point: influence of the asteroseismic approach, in and beyond the kepler field |
we examine the properties of the low-redshift circumgalactic medium (cgm) around star-forming and quenched galaxies in the simba cosmological hydrodynamic simulations, focusing on comparing h i and metal line absorption to observations from the cosmic origins spectrograph (cos)-halos and cos-dwarfs surveys. halo baryon... | the low-redshift circumgalactic medium in simba |
context. the mechanism of dust formation in galaxies at high redshift is still unknown. asymptotic giant branch (agb) stars and explosions of supernovae (sne) are possible dust producers, and non-stellar processes may substantially contribute to dust production, for example grain growth in the interstellar medium.aims:... | dust production scenarios in galaxies at z ∼6-8.3 |
high-z agns hosted in gas-rich galaxies are expected to grow through significantly obscured accretion phases. this may limit or bias their observability. in this work, we use bluetides, a large volume cosmological simulation of galaxy formation to examine quasar obscuration for the highest redshift (z ≥ 7) supermassive... | qso obscuration at high redshift (z ≳ 7): predictions from the bluetides simulation |
we present agnfitter, a publicly available open-source algorithm implementing a fully bayesian markov chain monte carlo method to fit the spectral energy distributions (seds) of active galactic nuclei (agns) from the sub-millimeter to the uv, allowing one to robustly disentangle the physical processes responsible for t... | agnfitter: a bayesian mcmc approach to fitting spectral energy distributions of agns |
we present a hubble space telescope survey of extended [o iii] λ5007 emission for a sample of 12 nearby (z < 0.12), luminous type 2 quasars (qso2s), which we use to measure the extent and kinematics of their agn-ionized gas. we find that the size of the observed [o iii] regions scale with luminosity in comparison to... | hubble space telescope observations of extended [o iii]λ 5007 emission in nearby qso2s: new constraints on agn host galaxy interaction |
spinning black holes in the centres of galaxies can release powerful magnetised jets. when the jets are observed at angles of less than a few degrees to the line-of-sight, they are called blazars, showing variable non-thermal emission across the electromagnetic spectrum from radio waves to gamma rays. it is commonly be... | gamma-ray flares from relativistic magnetic reconnection in the jet of the quasar 3c 279 |
we consider the largest observed sample including all intermediate-frequency peaked (ibl) and high-frequency peaked (hbl) flaring blazars above 100 gev up to redshift z = 0.6. we show that the best-fitting regression line of the emitted spectral indices γem(z) is a concave parabola decreasing as z increases, thereby im... | hint at an axion-like particle from the redshift dependence of blazar spectra |
we study the relation between accretion rate (in terms of l/ledd) and shape of the hard x-ray spectral energy distribution (namely the photon index γx) for a large sample of 228 hard x-ray-selected, low-redshift active galactic nuclei (agns), drawn from the swift/bat agn spectroscopic survey (bass). this includes 30 ag... | bat agn spectroscopic survey (bass) - vi. the γx-l/ledd relation |
we report the serendipitous detection of a 0.2 l*, lyα emitting galaxy at redshift 2.5 at an impact parameter of 50 kpc from a bright background qso sightline. a high-resolution spectrum of the qso reveals a partial lyman-limit absorption system ({n}_h i=10^{16.94± 0.10} cm-2) with many associated metal absorption line... | metal-enriched, subkiloparsec gas clumps in the circumgalactic medium of a faint z = 2.5 galaxy |
we report the detection of adfs-27, a dusty, starbursting major merger at a redshift of z = 5.655, using the atacama large millimeter/submillimeter array (alma). adfs-27 was selected from herschel/spectral and photometric imaging receiver (spire) and apex/laboca data as an extremely red “870 μm riser” (i.e., {s}250μ {{... | rise of the titans: a dusty, hyper-luminous “870 μm riser” galaxy at z ∼ 6 |
the pan-starrs1 (ps1) 3π survey is a comprehensive optical imaging survey of three quarters of the sky in the grizy broad-band photometric filters. we present the methodology used in assembling the source classification and photometric redshift (photo-z) catalogue for ps1 3π data release 1, titled pan-starrs1 source ty... | ps1-strm: neural network source classification and photometric redshift catalogue for ps1 3π dr1 |
we present the quasar luminosity function at z ∼ 5 derived from the optical wide-field survey data obtained as a part of the subaru strategic program (ssp) with the hyper suprime-cam (hsc). from a ∼81.8 deg2 area in the wide layer of the hsc-ssp survey, we selected 224 candidates of low-luminosity quasars at z ∼ 5 by a... | the faint end of the quasar luminosity function at z ∼ 5 from the subaru hyper suprime-cam survey |
the near earth object wide-field infrared survey explorer (neowise) reactivation mission released data from its first full year of observations in 2015. this data set includes ∼2.5 million exposures in each of w1 and w2, effectively doubling the amount of wise imaging available at 3.4 μm and 4.6 μm relative to the allw... | full-depth coadds of the wise and first-year neowise-reactivation images |
we report the first results of a survey on 74 narrow-line seyfert 1 galaxies (nls1s) carried out in 2015 with the karl g. jansky very large array (jvla) at 5 ghz in a-configuration. so far, this is the largest survey aimed to image the radio continuum of nls1s. we produced radio maps in order to compare the general pro... | radio-emitting narrow-line seyfert 1 galaxies in the jvla perspective |
among more than 200 quasars known at z ≳ 6, only one object, j0100+2802 (z = 6.327), was found hosting a >1010 m ⊙ supermassive black hole. in order to investigate the host galaxy properties of j0100+2802, we performed multi-band alma observations, aiming at mapping the dust continuum, [c ii] and co(6-5) emission li... | spatially resolved interstellar medium and highly excited dense molecular gas in the most luminous quasar at z = 6.327 |
we study the extended chandra deep field-south very large array sample, which reaches a flux density limit at 1.4 ghz of 32.5 μjy at the field centre and redshift ∼4, and covers ∼0.3 deg2. number counts are presented for the whole sample while the evolutionary properties and luminosity functions are derived for active ... | radio-faint agn: a tale of two populations |
atacama large millimeter array [c ii] line and continuum observations of five redshift z> 6 quasars are presented. this sample was selected to probe quasars with lower black hole mass than most previous studies. we find a wide dispersion in properties with cfhqs j0216-0455, a low-luminosity quasar with absolute magn... | a wide dispersion in star formation rate and dynamical mass of 108 solar mass black hole host galaxies at redshift 6 |
we use cosmological hydrodynamic simulations with stellar feedback from the fire (feedback in realistic environments) project to study the physical nature of lyman limit systems (llss) at z ≤ 1. at these low redshifts, llss are closely associated with dense gas structures surrounding galaxies, such as galactic winds, d... | low-redshift lyman limit systems as diagnostics of cosmological inflows and outflows |
we present the first data release (dr1) of the uves spectral quasar absorption database (squad), comprising 467 fully reduced, continuum-fitted high-resolution quasar spectra from the ultraviolet and visual echelle spectrograph (uves) on the european southern observatory's very large telescope. the quasars have redshif... | the uves spectral quasar absorption database (squad) data release 1: the first 10 million seconds |
we use a semi-analytic model to explore the potential impact of a brief and violent period of radio-loud accretion on to black holes (the radio scream) during the cosmic dawn on the h i hyperfine 21 cm signal. we find that radio emission from supermassive black hole seeds can impact the global 21 cm signal at the level... | the radio scream from black holes at cosmic dawn: a semi-analytic model for the impact of radio-loud black holes on the 21 cm global signal |
we describe the kinematics of circumgalactic gas near the galactic plane, combining new measurements of galaxy rotation curves and spectroscopy of background quasars. the sightlines pass within 19-93 kpc of the target galaxy and generally detect mg ii absorption. the mg ii doppler shifts have the same sign as the galac... | quasars probing galaxies. i. signatures of gas accretion at redshift approximately 0.2 |
we report on the first alma observation of the co(3-2) and rest-frame ∼340 ghz continuum emission in pds 456, which is the most luminous, radio-quiet qso in the local universe (z ≃ 0.18), with a bolometric luminosity lbol ∼ 1047 erg s-1. alma angular resolution allowed us to map scales as small as ∼700 pc. the molecula... | the gentle monster pds 456. kiloparsec-scale molecular outflow and its implications for qso feedback |
we provide a comprehensive census of the near-infrared (nir, 0.8-2.4 μm) spectroscopic properties of 102 nearby (z < 0.075) active galactic nuclei (agn), selected in the hard x-ray band (14-195 kev) from the swift-burst alert telescope survey. with the launch of the james webb space telescope, this regime is of incr... | bat agn spectroscopic survey - iv: near-infrared coronal lines, hidden broad lines, and correlation with hard x-ray emission |
based on broadband spectral energy distributions (seds), we estimate the jet physical parameters of 1392 γ-ray-loud active galactic nuclei (agns), the largest sample so far. the (sed) jet power and magnetization parameter are derived for these agns. out of these sources, the accretion disk luminosity of 232 sources and... | on the jet properties of γ-ray-loud active galactic nuclei |
we present predictions for the high-redshift halo-galaxy-supermassive black hole (smbh) connection from the trinity model. constrained by a comprehensive compilation of galaxy ($0\leq z \leq 10$) and smbh datasets ($0\leq z \leq 6.5$), trinity finds: 1) the number of smbhs with $m_\bullet > 10^9 m_\odot$ in the obse... | trinity iv: predictions for supermassive black holes at $z \\gtrsim 7$ |
we investigate the black hole mass function (bhmf) and eddington ratio distribution function (erdf) of broad-line agns at z=4, based on a sample of 52 quasars with i<23.2 at 3.50 < z < 4.25 from the hyper suprime-cam subaru strategic program (hsc-ssp) s16a-wide2 dataset, and 1,462 quasars with i<20.2 in the... | black hole mass and eddington ratio distributions of less-luminous quasars at $z\\sim4$ in the subaru hyper suprime-cam wide field |
dense gas in minihalos (mhs) with masses of $10^6-10^8~m_\odot$ can shield themselves from reionization for about $100$ megayears after being exposed to uv radiation. these self-shielded systems, often unresolved in cosmological simulations, can introduce strong absorption in quasar spectra. this paper is the first sys... | impact of self-shielding minihalos on the ly$\\alpha$ forest at high redshift |
we present atacama large millimeter/submillimeter array (alma) observations of the [c ii] fine-structure line and the underlying far-infrared (fir) dust continuum emission in j1120+0641, the most distant quasar currently known (z=7.1). we also present observations targeting the co(2-1), co(7-6), and [c i] 369 μm lines ... | the compact, ∼1 kpc host galaxy of a quasar at a redshift of 7.1 |
many black holes detected by the laser interferometer gravitational-wave observatory (ligo) and the virgo detectors are multiple times more massive than those in x-ray binaries. one possibility is that some binary black holes (bbhs) merge within a few schwarzschild radii of a supermassive black hole (smbh), so that the... | the last migration trap of compact objects in agn accretion disc |
disks of gas accreting onto supermassive black holes are thought to power active galactic nuclei (agn). stars may form in gravitationally unstable regions of these disks, or may be captured from nuclear star clusters. because of the dense gas environment, the evolution of these embedded stars can diverge dramatically f... | accretion onto stars in the disks of active galactic nuclei |
we explore the potential of using the low-redshift lyman-$\alpha$ (ly$\alpha$) forest surrounding luminous red galaxies (lrgs) as a tool to constrain active galactic nuclei (agn) feedback models. our analysis is based on snapshots from the illustris and illustristng simulations at a redshift of $z=0.1$. these simulatio... | searching for the imprints of agn feedback on the lyman alpha forest around luminous red galaxies |
we present new chandra x-ray observatory and hubble space telescope observations of eight optically selected broad-line active galactic nucleus (agn) candidates in nearby dwarf galaxies (z < 0.055). including archival chandra observations of three additional sources, our sample contains all 10 galaxies from reines e... | x-ray and ultraviolet properties of agns in nearby dwarf galaxies |
we study the influence of a high baryonic streaming velocity on the formation of direct collapse black holes (dcbhs) with the help of cosmological simulations carried out using the moving mesh code arepo. we show that a streaming velocity that is as large as three times the root-mean-squared value is effective at suppr... | the formation of direct collapse black holes under the influence of streaming velocities |
the first stars were born from chemically pristine gas. they were likely massive, and thus they rapidly exploded as supernovae, enriching the surrounding gas with the first heavy elements. in the local group, the chemical signatures of the first stellar population were identified among low-mass, long-lived, very metal-... | evidence of first stars-enriched gas in high-redshift absorbers |
the bright blazar oj 287 routinely parades high brightness bremsstrahlung flares, which are explained as being a result of a secondary supermassive black hole (smbh) impacting the accretion disc of a more massive primary smbh in a binary system. the accretion disc is not rigid but rather bends in a calculable way due t... | refining the oj 287 2022 impact flare arrival epoch |
the correlation between the broad line region radius and continuum luminosity (r-l relation) of active galactic nuclei (agns) is critical for single-epoch mass estimates of supermassive black holes (smbhs). at z ~ 1-2, where agn activity peaks, the r-l relation is constrained by the reverberation mapping (rm) lags of t... | ozdes reverberation mapping programme: mg ii lags and r-l relation |
we present, for the first time, dark matter halo (dmh) mass measurement of quasars at z ~ 6 based on a clustering analysis of 107 quasars. spectroscopically identified quasars are homogeneously extracted from the hyper suprime-cam strategic survey program wide layer over 891 deg2. we evaluate the clustering strength by... | subaru high-z exploration of low-luminosity quasars (shellqs). xviii. the dark matter halo mass of quasars at z 6 |
a new, complete sample of 14,584 broad-line active galactic nuclei (agns) at z < 0.35 is presented, which are uncovered homogeneously from the complete database of galaxies and quasars observed spectroscopically in the sloan digital sky survey seventh data release. the stellar continuum is properly removed for each ... | a comprehensive and uniform sample of broad-line active galactic nuclei from the sdss dr7 |
compressing large data sets to a manageable number of summaries that are informative about the underlying parameters vastly simplifies both frequentist and bayesian inference. when only simulations are available, these summaries are typically chosen heuristically, so they may inadvertently miss important information. w... | automatic physical inference with information maximizing neural networks |
we present a study of the metal-enriched halo gas, traced using mg ii and [o ii] emission lines, in two large, blind galaxy surveys - the muse (multi unit spectroscopic explorer) analysis of gas around galaxies (magg) and the muse ultra deep field (mudf). by stacking a sample of ≈600 galaxies (stellar masses $m_*$ ≈ 10... | metal line emission from galaxy haloes at z ≈ 1 |
although the hubble constant h0 and spatial curvature ωk have been measured with very high precision, they still suffer from some tensions. in this paper, we propose an improved method to combine the observations of ultracompact structure in radio quasars and strong gravitational lensing with quasars acting as backgrou... | measurements of the hubble constant and cosmic curvature with quasars: ultracompact radio structure and strong gravitational lensing |
we present a study of the relation between x-rays and ultraviolet emission in quasars for a sample of broad-line, radio-quiet objects obtained from the cross-match of the sloan digital sky survey dr14 with the latest chandra source catalog 2.0 (2332 quasars) and the chandra cosmos legacy survey (273 quasars). the non-l... | the chandra view of the relation between x-ray and uv emission in quasars |
quasar-driven outflows must have made their most significant impact on galaxy formation during the epoch when massive galaxies were forming most rapidly. to study the impact of quasar feedback, we conducted rest-frame optical integral field spectrograph (ifs) observations of three extremely red quasars (erqs) and one t... | powerful winds in high-redshift obscured and red quasars |
we study axion strings of hyperlight axions coupled to photons. hyperlight axions — axions lighter than hubble at recombination — are a generic prediction of the string axiverse. these axions strings produce a distinct quantized polarization rotation of cmb photons which is o (αem). as the cmb light passes many strings... | a cmb millikan experiment with cosmic axiverse strings |
we report the results of james webb space telescope/nircam observations of 19 (sub)millimeter sources detected by the atacama large millimeter array (alma). the accurate alma positions allowed unambiguous identifications of their nircam counterparts. taking gravitational lensing into account, these represent 16 distinc... | jwst's pearls: a jwst/nircam view of alma sources |
we construct cosmic void catalogues with the dive void finder upon sdss boss dr12 and eboss dr16 galaxy samples with bao reconstruction, and perform a joint bao analysis using different types of galaxies and the corresponding voids. the bao peak is evident for the galaxy-galaxy, galaxy-void, and void-void correlation f... | the completed sdss-iv extended baryon oscillation spectroscopic survey: cosmological implications from multitracer bao analysis with galaxies and voids |
massive black holes in the centres of galaxies today must have grown by several orders of magnitude from seed black holes formed at early times. detecting a population of intermediate mass black holes (imbhs) can provide constraints on these elusive bh seeds. here, we use the large volume cosmological hydrodynamical si... | a vast population of wandering and merging imbhs at cosmic noon |
we use 118 hβ quasar (qso) observations in the redshift range 0.0023 ≤ z ≤ 0.89 to simultaneously constrain cosmological model parameters and qso 2-parameter radius-luminosity (r-l) relation parameters in six different cosmological models. we find that the r-l relation parameters for these qsos are independent of the a... | do reverberation-measured hβ quasars provide a useful test of cosmology? |
we present the first polarimetric space very long baseline interferometry (vlbi) observations of oj 287, observed with radioastron at 22 ghz during a perigee session on 2014 april 4 and five near-in-time snapshots, together with contemporaneous ground vlbi observations at 15, 43, and 86 ghz. ground-space fringes were o... | probing the innermost regions of agn jets and their magnetic fields with radioastron. v. space and ground millimeter-vlbi imaging of oj 287 |
context. quasi-periodic x-ray eruptions (qpes) are a recently discovered phenomenon, the nature of which remains unclear. based on their discovery in active galactic nuclei (agns), explanations related to an agn accretion disk or potentially a stellar tidal disruption event (tde) have been put forward. alternatives, in... | host galaxy properties of quasi-periodically erupting x-ray sources |
our motion through the universe generates a dipole in the temperature anisotropies of the cosmic microwave background (cmb) and also in the angular distribution of sources. if the cosmological principle is valid, these two dipoles are directly linked, such that the amplitude of one determines that of the other. however... | on the kinematic cosmic dipole tension |
the detection of lyα nebulae around z ≳ 6 quasars reveals extended gas reservoirs around the first rapidly growing supermassive black holes. observations of z > 6 quasars can be explained by cosmological models provided that the black holes by which they are powered evolve in rare, massive dark matter haloes. whethe... | agn-driven outflows and the formation of lyα nebulae around high-z quasars |
we detect the cross-correlation between 2.7 million desi quasar targets across 14,700 deg$^2$ (180 quasars deg$^{-2}$) and planck 2018 cmb lensing at $\sim$30$\sigma$. we use the cross-correlation on very large scales to constrain local primordial non-gaussianity via the scale dependence of quasar bias. the desi quasar... | constraining primordial non-gaussianity from desi quasar targets and planck cmb lensing |
we consider the effect of including an active galactic nuclei (agn) component when fitting spectral energy distributions of 109 spectroscopically confirmed z ≈ 3.5-12.5 galaxies with jwst. remarkably, we find that the resulting cosmic star formation history is ≈0.4 dex lower at z ≳ 9.5 when an agn component is included... | star formation and agn activity 500 myr after the big bang: insights from jwst |
context. the z ∼ 0.1 type-2 qso j1430+1339, known as the "teacup", is a complex galaxy showing a loop of ionised gas ∼10 kpc in diameter, co-spatial radio bubbles, a compact (∼1 kpc) jet, and outflow activity. its closeness offers the opportunity to study in detail the intricate interplay between the central supermassi... | complex agn feedback in the teacup galaxy. a powerful ionised galactic outflow, jet-ism interaction, and evidence for agn-triggered star formation in a giant bubble |
without active galactic nucleus (agn) feedback, simulated massive, star-forming galaxies become too compact relative to observed galaxies at z ≲ 2. in this paper, we perform high-resolution re-simulations of a massive ($m_{\star }\sim 10^{11}\, \rm {{\rm m}_{\odot }}$) galaxy at z ~ 2.3, drawn from the feedback in real... | the impact of agn-driven winds on physical and observable galaxy sizes |
we present a reanalysis of reverberation mapping data from 2005 for the seyfert galaxy ngc 4151, supplemented with additional data from the literature to constrain the continuum variations over a significantly longer baseline than the original monitoring program. modeling of the continuum light curve and the velocity-r... | the broad line region and black hole mass of ngc 4151 |
reverberation mapping is a robust method to measure the masses of supermassive black holes outside of the local universe. measurements of the radius-luminosity (r-l) relation using the mg ii emission line are critical for determining these masses near the peak of quasar activity at z ≈ 1-2, and for calibrating secondar... | ozdes reverberation mapping programme: the first mg ii lags from 5 yr of monitoring |
the project momo (multiwavelength observations and modelling of oj 287) was set up to test predictions of binary supermassive black hole (smbh) scenarios and to understand disc-jet physics of the blazar oj 287. after a correction, the precessing binary (pb) smbh model predicted the next main outburst of oj 287 in 2022 ... | absence of the predicted 2022 october outburst of oj 287 and implications for binary smbh scenarios |
this paper presents a survey of mg ii absorbing gas in the vicinity of 380 random galaxies, using 156 background quasi-stellar objects (qsos) as absorption-line probes. the sample comprises 211 isolated (73 quiescent and 138 star-forming galaxies) and 43 non-isolated galaxies with sensitive constraints for both mg ii a... | a complete census of circumgalactic mg ii at redshift z ≲ 0.5 |
the observation of a very high-energy neutrino by icecube (icecube-170922a) and its association with the flaring blazar txs 0506 + 056 provided the first multimessenger observations of blazar jets, demonstrating the important role of protons in their dynamics and emission. in this paper, we present soprano (https://www... | time-dependent lepto-hadronic modelling of the emission from blazar jets with soprano: the case of txs 0506 + 056, 3hsp j095507.9 + 355101, and 3c 279 |
we present the z ≈ 6 type-1 quasar luminosity function (qlf), based on the pan-starrs1 (ps1) quasar survey. the ps1 sample includes 125 quasars at z ≈ 5.7-6.2, with -28 ≲ m 1450 ≲ -25. with the addition of 48 fainter quasars from the shellqs survey, we evaluate the z ≈ 6 qlf over -28 ≲ m 1450 ≲ -22. adopting a double p... | the pan-starrs1 z > 5.6 quasar survey. iii. the z ≈ 6 quasar luminosity function |
we present bolometric luminosities, black hole masses, and eddington ratios for 42 luminous quasars at z ≳ 6 using high signal-to-noise ratio vlt/x-shooter spectra, acquired as part of the enlarged eso large programme xqr-30. in particular, we derived the bolometric luminosities from the rest-frame 3000 å luminosities ... | xqr-30: black hole masses and accretion rates of 42 z ≳ 6 quasars |
previously, we demonstrated that mgii and civ reverberation-mapped quasars (rm qsos) are standardizable and that the cosmological parameters inferred using the broad-line region radius-luminosity (r-l) relation are consistent with those determined from better-established cosmological probes. with more data expected fro... | effects of heterogeneous data sets and time-lag measurement techniques on cosmological parameter constraints from mgii and civ reverberation-mapped quasar data |
cosmological models and their parameters are widely debated because of theoretical and observational mismatches of the standard cosmological model, especially the current discrepancy between the value of the hubble constant, $h_{0}$, obtained by type ia supernovae (sne ia), and the cosmic microwave background radiation... | a bias-free cosmological analysis with quasars alleviating $h_0$ tension |
red quasars are candidate young objects in an early transition stage of massive galaxy evolution. our team recently discovered a population of extremely red quasars (erqs) in the baryon oscillation spectroscopic survey (boss) that has a suite of peculiar emission-line properties including large rest equivalent widths (... | extremely red quasars in boss |
we study the broad emission line blazars detected in the γ-ray band by the large area telescope onboard the fermi satellite and with the optical spectrum studied by shaw et al. the observed broad line strength provides a measure of the ionizing luminosity of the accretion disc, while the γ-luminosity is a proxy for the... | fermi/lat broad emission line blazars |
we report new iram/pdbi, jcmt/scuba-2, and vla observations of the ultraluminous quasar sdss j010013.02+280225.8 (hereafter, j0100+2802) at z = 6.3, which hosts the most massive supermassive black hole (smbh), 1.24× {10}10 {m}⊙ , that is known at z > 6. we detect the [c ii] 158 μm fine structure line and molecular c... | probing the interstellar medium and star formation of the most luminous quasar at z = 6.3 |
we report new alma observations of the co(3-2) line emission from the 2.1+/- 0.3× {10}10 {m}⊙molecular gas reservoir in the central galaxy of the phoenix cluster. the cold molecular gas is fueling a vigorous starburst at a rate of 500{--}800 {m}⊙{{yr}}-1 and powerful black hole activity in the forms of both intense qua... | alma observations of massive molecular gas filaments encasing radio bubbles in the phoenix cluster |
we demonstrate the presence of an extended and massive circumgalactic medium (cgm) around messier 31 using archival hst cosmic origins spectrograph ultraviolet spectroscopy of 18 qsos projected within two virial radii of m31 ({{r}vir}=300 kpc). we detect absorption from si iii at -300≲ {{v}lsr}≲ -150 km s-1 toward all ... | evidence for a massive, extended circumgalactic medium around the andromeda galaxy |
the gravitationally lensed galaxy a1689-zd1 is one of the most distant spectroscopically confirmed sources (z = 7.5). it is the earliest known galaxy where the interstellar medium (ism) has been detected; dust emission was detected with the atacama large millimetre array (alma). a1689-zd1 is also unusual among high-red... | a merger in the dusty, z = 7.5 galaxy a1689-zd1? |
in the last few years, it became possible to observationally resolve galaxies with two distinct nuclei in their centre. for separations smaller than 10 kpc, dual and offset active galactic nuclei (agn) are distinguished: in dual agn, both nuclei are active, whereas in offset agn only one nucleus is active. to study the... | origin and properties of dual and offset active galactic nuclei in a cosmological simulation at z=2 |
we recently used hydrochemical simulations to demonstrate that molecular outflows observed in luminous quasars can be explained by molecule formation within the active galactic nucleus (agn) wind. however, these simulations cover a limited parameter space due to their computational cost. we have therefore developed an ... | radiative cooling of swept-up gas in agn-driven galactic winds and its implications for molecular outflows |
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