A5064492894- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Gyrotron and Vacuum Electronics Research
- Libraries, Manuscripts, and Books
- Neutrino Physics Research
- Geomagnetism and Paleomagnetism Studies
- Astrophysics and Star Formation Studies
- Dark Matter and Cosmic Phenomena
- Electromagnetic Fields and Biological Effects
- Particle physics theoretical and experimental studies
- Scientific Research and Philosophical Inquiry
- Computational Physics and Python Applications
- Literacy and Educational Practices
University of California, Los Angeles
2024
Max Planck Institute for Astronomy
2020-2024
The University of Texas at Austin
2020
Abstract We present a detailed stellar population analysis of 11 bright ( H < 26.6) galaxies at z = 9–11 (three spectroscopically confirmed) to constrain the chemical enrichment and growth mass early galaxies. use flexible Bayesian spectral energy distribution (SED) fitting code Prospector with range star formation histories (SFHs), dust attenuation law, self-consistent model emission lines. This approach allows us assess how different priors affect our results well we can break...
We present the results from a new search for candidate galaxies at z ~ 8.5-11 discovered over 850 arcmin^2 area probed by Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey (CANDELS). use photometric redshift selection including both Hubble and Spitzer Space Telescope photometry to robustly identify in this epoch F160W < 26.6. detailed vetting procedure, screening persistence, stellar contamination, inclusion of ground-based imaging, followup space-based imaging build robust...
We present the first results from JWST ASPIRE program (A SPectroscopic survey of biased halos In Reionization Era). This represents an imaging and spectroscopic 25 reionization-era quasars their environments by utilizing unprecedented capabilities NIRCam Wide Field Slitless Spectroscopy (WFSS) mode. will deliver largest ($\sim280~{\rm arcmin}^2$) galaxy redshift at 3-4 $\mu$m among Cycle-1 programs provide extensive legacy values for studying formation earliest supermassive black holes...
ABSTRACT The final phase of the reionization process can be probed by rest-frame UV absorption spectra quasars at z ≳ 6, shedding light on properties diffuse intergalactic medium within first Gyr Universe. ESO Large Programme ‘XQR-30: ultimate XSHOOTER legacy survey ≃ 5.8–6.6’ dedicated ∼250 h observations VLT to create a homogeneous and high-quality sample 30 luminous ∼ covering rest wavelength range from Lyman limit beyond Mg ii emission. Twelve quasar similar quality archive were added...
Abstract We present the results from a spectroscopic survey using MOSFIRE near-infrared spectrograph on 10 m Keck telescope to search for Ly α emission candidate galaxies at z ∼ 9–10 in four of CANDELS fields (GOODS-N, EGS, UDS, and COSMOS). observed 11 target galaxies, detecting one object ∼8.1 hr integration, = 8.665 ± 0.001 with an integrated signal-to-noise ratio > 7. This galaxy is Extended Groth Strip (EGS) field lies physically close (3.5 physical Mpc [pMpc]) another confirmed this...
Studies of rest-frame optical emission in quasars at $z>6$ have historically been limited by the wavelengths accessible ground-based telescopes. The James Webb Space Telescope (JWST) now offers opportunity to probe this deep into reionization epoch. We report observations eight $z>6.5$ using JWST/NIRCam Wide Field Slitless Spectroscopy, as a part ''A SPectroscopic survey biased halos In Reionization Era (ASPIRE)" program. Our JWST spectra cover quasars' between rest frame $\sim$ 4100 and...
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 in the enlarged ESO Large Programme XQR-30. In particular, we derive luminosities from rest-frame 3000 A, a correction literature, by modelling spectral regions around CIV 1549A MgII 2798A emission lines, with scaling relations calibrated local universe. find that derived both lines are same range, scatter of measurements...
Abstract The abundance of bright galaxies at z > 8 can provide key constraints on models galaxy formation and evolution, as the predicted varies greatly when different physical prescriptions for gas cooling star are implemented. We present results a search ∼ 9–10 selected from pure parallel Hubble Space Telescope (HST) imaging programs. include 132 fields observed part Brightest Reionizing Galaxies survey, Infrared Pure Parallel Imaging Extragalactic Survey, WFC3 Spectroscopic survey....
Abstract We present in this paper (Paper II of the series) a 35 arcmin 2 JWST/NIRCam imaging and wide-field slitless spectroscopy mosaic centered on J0305–3150, luminous quasar at z = 6.61. The F356W grism data reveal 124 [O iii ]+H β emitters 5.3 < 7, 53 which constitute protocluster spanning (10 cMpc) across 6.5 6.8. find no evidence any broad-line active galactic nucleus (AGN) individual galaxies or stacking, reporting median H FWHM 585 ± 152 km s −1 ; however, mass–excitation diagram...
Abstract A SPectroscopic survey of bIased halos in the Reionization Era is a quasar legacy primarily using JWST to target sample 25 z > 6 quasars with NIRCam slitless spectroscopy and imaging. The first study this series found evidence strong overdensity galaxies around J0305−3150, luminous at = 6.61, within single pointing obtained Cycle 1. Here we present results 2 mosaic that covers 35 arcmin imaging/wide-field same field investigate spatial extent putative protocluster. F356W grism...
Abstract Theoretical models predict that z ≳ 6 quasars are hosted in the most massive halos of underlying dark matter distribution and thus would be immersed protoclusters galaxies. However, observations report inconclusive results. We investigate 1.1 proper-Mpc 2 environment = 7.54 luminous quasar ULAS J1342+0928. search for Lyman-break galaxy (LBG) candidates using deep imaging from Hubble Space Telescope (HST) Advanced Camera Surveys (ACS)/F814W, Wide Field 3 (WFC3)/F105W/F125W bands,...
Abstract Low-luminosity active galactic nuclei (AGNs) with low-mass black holes (BHs) in the early universe are fundamental to understanding BH growth and their coevolution host galaxies. Utilizing JWST NIRCam Wide Field Slitless Spectroscopy, we perform a systematic search for broad-line H α emitters (BHAEs) at z ≈ 4–5 25 fields of A SPectroscopic survey biased halos In Reionization Era (ASPIRE) project, covering total area 275 arcmin 2 . We identify 16 BHAEs FWHM broad components spanning...
Abstract With enough X-ray flux to be detected in a 160 s scan by SRG/eROSITA, the z = 6.19 quasar CFHQS J142952+544717 is, far, most luminous source known at > 6. We present deep (245 ks) NuSTAR observations of this source; with ∼180 net counts combined observations, is distant object ever observed observatory. Fortuitously, was independently Chandra ∼110 days earlier, enabling identification two nearby (30″ and 45″ away), fainter sources. jointly fit both observations—self-consistently...
With enough X-ray flux to be detected in a 160s scan by SRG/eROSITA, the $z = 6.19$ quasar CFHQS J142952+544717 is, far, most luminous source known at > 6$. We present deep (245 ks) NuSTAR observations of this source; with $\sim180$ net counts combined observations, is distant object ever observed observatory. Fortuitously, was independently Chandra $\sim110$ days earlier, enabling identification two nearby (30'' and 45'' away), fainter sources. jointly fit both...
Abstract We present the BoRG-JWST survey, a combination of two JWST Cycle 1 programs aimed at obtaining NIRSpec spectroscopy representative, UV-bright 7 < z 10 galaxy candidates across 22 independent sight lines selected from Hubble/WFC3 pure-parallel observations. confirm high- nature 12 out 21 observed primary targets through low-resolution prism observations, with rest revealing themselves unsurprisingly to be ∼ 1–3 interlopers, brown dwarfs, or yielding inconclusive results. From...
Abstract We present high-angular-resolution (0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover> <mml:mrow> <mml:mo>.</mml:mo> </mml:mrow> <mml:mtext>″</mml:mtext> </mml:mover> </mml:math> 068, ∼400 pc) Atacama Large Millimeter/submillimeter Array (ALMA) imaging of the [C ii ] line and dust continuum emission PSO J352.4034–15.3373, a radio-loud quasar at z = 5.83. The observations reveal remarkably close match between orientation thermal mapped by ALMA...
Abstract We present the first study dedicated to measuring timescales for black hole accretion and jet launching in a quasar at edge of reionization, PSO J352.4034–15.3373 z = 5.832 ± 0.001. Previous work presented evidence strong radio synchrotron emission from affecting host galaxy's dust-dominated continuum ν rest 683 GHz ( obs 100 GHz), implying break spectrum. In this work, we quasi-simultaneous observations 1.5 GHz–42 with Karl G. Jansky Very Large Array, derive frequency <mml:math...
Abstract We present new results on the rest-frame UV luminosity function (UVLF) and stellar mass-to-light ( M / L ) ratio of bright ≲ −20 mag) spectroscopically confirmed galaxies at z = 7–9 derived from BoRG-JWST survey, a unique data set NIRSpec prism follow-up Hubble Space Telescope (HST)–selected sources random-pointing imaging. By selecting over 300 independent sight lines, survey minimizes cosmic variance, ensuring statistically robust sample bright-galaxy population during epoch...
There are only five radio-loud quasars currently known within 1 Gyr from the Big Bang ($z>6$) and properties of their host galaxies have not been explored in detail. We present a NOrthern Extended Millimeter Array (NOEMA) survey [CII] (158 $\mu$m) underlying continuum emission four $z>6$ quasars, revealing diverse properties. J0309+2717 ($z=6.10$) has bright line continuum, implying starburst with star-formation rate SFR=$340-1200$ $M_\odot$ yr$^{-1}$. J1429+5447 ($z=6.18$) SFR=$520-870$...
We present the JWST/NIRSpec PRISM follow-up of candidate galaxies at zsimeq 9-11 selected from deep JWST/NIRCam photometry in GLASS-JWST Early Release Science data. spectroscopically confirm six sources with secure redshifts z = 9.52–10.43, each showing multiple emission lines. An additional object is likely simeq 10.66, based on its and a single feature, while one source lower-redshift interloper. The sample includes first JWST-detected zsim 10, GHZ1/GLASS-z10, which we 9.875, X-ray...
Abstract We present millimeter observations of the host galaxy most distant blazar known, VLASS J041009.05−013919.88 (hereafter J0410–0139) at z = 7, using Atacama Large Millimeter/submillimeter Array (ALMA) and NOrthern Extended Millimeter (NOEMA) observations. The ALMA data reveal a (2.02 ± 0.36) × 10 42 erg s −1 [C ii ] 158 μ m emission line 6.9964 with ]-inferred star formation rate (SFR) 58 9 M ⊙ yr . estimate dynamical mass dyn,[C (4.6 2.0) , implying black hole to ratio <mml:math...
Abstract The interactions between radio jets and the interstellar medium play a defining role for coevolution of central supermassive black holes their host galaxies, but observational constraints on these feedback processes are still very limited at redshifts z > 2. We investigate radio-loud quasar PSO J352.4034–15.3373 ∼ 6 edge Epoch Reionization. This is among most powerful emitters first one with direct evidence extended (∼1.6 kpc) high redshifts. analyze NOrthern Extended Millimeter...
The abundance of bright galaxies at z>8 can provide key constraints on models galaxy formation and evolution, as the predicted varies greatly when different physical prescriptions for gas cooling star are implemented. We present results a search z=9-10 selected from pure-parallel Hubble Space Telescope imaging programs. include 132 fields observed part Brightest Reionizing Galaxies survey, Infrared Pure Parallel Imaging Extragalactic Survey, WFC3 Spectroscopic survey. These observations...
We present the first results from JWST ASPIRE program (A SPectroscopic survey of biased halos In Reionization Era). This represents an imaging and spectroscopic 25 reionization-era quasars their environments by utilizing unprecedented capabilities NIRCam Wide Field Slitless Spectroscopy (WFSS) mode. will deliver largest ($\sim280~{\rm arcmin}^2$) galaxy redshift at 3-4 $μ$m among Cycle-1 programs provide extensive legacy values for studying formation earliest supermassive black holes...
Relativistic jets are thought to play a crucial role in the formation of massive galaxies and supermassive black holes. Here we report multi-wavelength multi-epoch observations quasar VLASSJ0410-0139 at redshift z=7, powered by 7e8 solar-mass hole. Its radio variability, X-ray properties, compact emission on parsec scales reveal that J0410-0139 is blazar with relativistic jet aligned our line sight. This blazar's existence implies many more similar (unaligned) jetted sources must exist z=7....