A5091062273- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- History and Developments in Astronomy
- Radio Astronomy Observations and Technology
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- CCD and CMOS Imaging Sensors
- Radiation Therapy and Dosimetry
- Advanced X-ray Imaging Techniques
- Distributed and Parallel Computing Systems
- Atomic and Molecular Physics
- Scientific Research and Discoveries
- Radar Systems and Signal Processing
- International Science and Diplomacy
- Cosmology and Gravitation Theories
- Mycotoxins in Agriculture and Food
- Medical and Agricultural Research Studies
University of Arizona
2021-2024
University of Oxford
2022
Goddard Space Flight Center
2017-2021
Deleted Institution
2019
American Society for Radiation Oncology
2019
University of Chicago
2014-2017
Kavli Institute for Particle Astrophysics and Cosmology
2014
Abstract The Near Infrared Camera for the James Webb Space Telescope (JWST) is delivering imagery that astronomers have hoped ever since JWST was proposed back in 1990s. In Commissioning Period extended from right after launch to early 2022 July, NIRCam has been subjected a number of performance tests and operational checks. camera exceeding prelaunch expectations virtually all areas, with very few surprises discovered flight. also delivered needed by Wavefront Sensing Team use aligning...
Abstract Using deep JWST imaging from JADES, JEMS, and SMILES, we characterize optically faint extremely red galaxies at z > 3 that were previously missing galaxy census estimates. The data indicate the existence of abundant, dusty, poststarburst-like down to 10 8 M ⊙ , below sensitivity limit Spitzer Atacama Large Millimeter/submillimeter Array (ALMA). Modeling NIRCam Hubble Space Telescope (HST) photometry these sources can result in high values for both stellar mass star formation rate...
Abstract Understanding the coevolution of supermassive black holes and their host systems requires a comprehensive census active galactic nuclei (AGNs) behavior across wide range redshift, luminosity, obscuration level, galaxy properties. We report significant progress with JWST toward this goal from Systematic Mid-infrared Instrument Legacy Extragalactic Survey (SMILES). Based on spectral energy distribution (SED) analysis 3273 MIRI-detected sources, we identify 217 AGN candidates over...
We present optical and near-IR imaging spectroscopy of SGAS J105039.6$+$001730, a strongly lensed galaxy at z $=$ 3.6252 magnified by $>$30$\times$, derive its physical properties. measure stellar mass log(M$_{*}$/M$_{\odot}$) 9.5 $\pm$ 0.35, star formation rates from [O II]$\lambda$$\lambda$3727 H-$\beta$ 55 20 84 17 M$_{\odot}$ yr$^{-1}$, respectively, an electron density n$_{e} \leq$ 10$^{3}$ cm$^{-2}$, temperature T$_{e} 14000 K, metallicity 12+log(O/H) 8.3 0.1. The strong C...
The gravitationally lensed star WHL0137-LS, nicknamed Earendel, was identified with a photometric redshift $z_{phot} = 6.2 \pm 0.1$ based on images taken the Hubble Space Telescope. Here we present James Webb Telescope (JWST) Near Infrared Camera (NIRCam) of Earendel in 8 filters spanning 0.8--5.0$\mu$m. In these higher resolution images, remains single unresolved point source lensing critical curve, increasing lower limit magnification to $\mu > 4000$ and restricting plane radius further $r...
Abstract Extreme, young stellar populations are considered to be the primary contributor cosmic reionization. How Lyman continuum (LyC) escapes these galaxies remains highly elusive, and it is challenging observe this process in actual LyC emitters without resolving relevant physical scales. We investigate Sunburst Arc, a strongly lensed emitter at z = 2.37 that reveals an exceptionally small-scale (tens of parsecs) region high escape. The small (<100 pc) LyC-leaking has extreme...
Aims. This paper utilises the James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) to extend observational studies of dust and polycyclic aromatic hydrocarbon (PAH) emission a new mass star formation rate (SFR) parameter space beyond our local Universe. The combination fully sampled spectral energy distributions (SEDs) with multiple mid-infrared (mid-IR) bands unprecedented sensitivity MIRI allows us investigate obscuration PAH behaviour from z = 0.7 up 2 in typical main-sequence...
Abstract We present measurements of the surface density star formation, star-forming clump luminosity function, and size distribution for lensed galaxy SGAS J111020.0+645950.8 at a redshift z = 2.481. The physical scales that we probe, radii r 30–50 pc, are considerably smaller than have yet been studied these redshifts. formation find within small clumps is consistent with densities measured previously other galaxies similar redshift. Twenty-two percent rest-frame ultraviolet light in this...
Detailed observations of star forming galaxies at high redshift are critical to understand the formation and evolution earliest galaxies. Gravitational lensing provides an important boost, allowing physical scales unreachable in unlensed We present three lensed from RELICS survey $z_{phot} = 6 - 10$, including most highly magnified galaxy \sim 6$ (WHL0137-zD1, dubbed Sunrise Arc), brightest known (MACS0308-zD1), only spatially resolved currently 10$ (SPT0615-JD). The Arc contains seven...
We report the detection of a population Wolf-Rayet (WR) stars in Sunburst Arc, strongly gravitationally lensed galaxy at redshift z = 2.37. As brightest known galaxy, Arc has become an important cosmic laboratory for studying star and cluster formation, Lyman α (Ly ) radiative transfer, continuum (LyC) escape. Here, we present first results JWST/NIRSpec IFU observations focusing on stacked spectrum 12-fold imaged LyC-emitting (LCE) cluster. In agreement with previous studies, find that LCE...
Abstract We present new, deep observations of the Phoenix cluster from Chandra , Hubble Space Telescope and Karl Jansky Very Large Array. These data provide an order-of-magnitude improvement in depth and/or angular resolution over previous at X-ray, optical, radio wavelengths. find that one-dimensional temperature entropy profiles are consistent with expectations for pure-cooling models. In particular, profile is well fit by a single power law all radii, no evidence excess core. inner ∼10...
Ionizing photons escape a lensed galaxy Young, hot stars emit ultraviolet radiation, which can ionize neutral gas. The first generation of converted most the intergalactic gas in Universe from to ionized form during epoch reionization less than billion years after Big Bang. Rivera-Thorsen et al. took advantage gravitational lensing system observe 12 images same star-forming region distant and determined fraction that into medium. Although this is younger reionization, results provide clues...
In a cold and stable space environment, the James Webb Space Telescope (JWST or "Webb") reaches unprecedented sensitivities at wavelengths beyond 2 microns, serving most fields of astrophysics. It also extends parameter high-contrast imaging in near mid-infrared. Launched late 2021, JWST underwent six month commissioning period. this contribution we focus on NIRCam Coronagraphy mode which was declared "science ready" July 10 2022, last 17 observing modes. Essentially, enables detection...
ABSTRACT We present spatially resolved Echelle spectroscopy of an intervening Mg ii–Fe ii–Mg i absorption-line system detected at zabs = 0.73379 towards the giant gravitational arc PSZ1 G311.65–18.48. The absorbing gas is associated with inclined disc-like star-forming galaxy, whose major axis aligned two arc-segments reported here. probe in absorption galaxy’s extended disc continuously, ≈3 kpc sampling, from its inner region out to 15× optical radius. detect strong ($W_0^{2796}\gt 0.3$Å)...
We analyze spectra of a gravitationally lensed galaxy, known as the Sunburst Arc, that is leaking ionizing photons, also Lyman continuum (LyC). Magnification from gravitational lensing permits galaxy to be spatially resolved into one region leaks and several do not. Rest-frame ultraviolet optical Magellan target ten different regions along including six multiple images LyC region, well four not show emission. The rest-frame photon emitting reveal blue-shifted ($\Delta V$=27 km s$^{-1}$)...
Surveys with James Webb Space Telescope (JWST) have discovered candidate galaxies in the first 400 Myr of cosmic time. Preliminary indications suggested these may be more massive and abundant than previously thought. However, without confirmed distances, their inferred properties remain uncertain. Here we identify four located JWST Advanced Deep Extragalactic Survey (JADES) Near-Infrared Camera (NIRCam) imaging photometric redshifts z~10-13. These include redshift z>12 systems distances...
Abstract For lensed galaxy SGAS J111020.0+645950.8 at redshift z = 2.481, which is magnified by a factor of 28 ± 8, we analyze the morphology star formation, as traced rest-frame ultraviolet emission, in both highly source plane and simulations how this would appear without lensing magnification. Were not lensed, but rather drawn from Hubble Space Telescope deep field, conclude that almost all its formation arises an exponential disk (Sérsic index 1.0 0.4) with effective radius <?CDATA...
Abstract Using the combined resolving power of Hubble Space Telescope and gravitational lensing, we resolve star-forming structures in a <?CDATA $z\sim 2.5$?> galaxy on scales much smaller than usual kiloparsec diffraction limit HST . SGAS J111020.0+645950.8 is clumpy, lensed by cluster SDSS J1110+6459 at $z=0.659$?> , with total magnification $\sim 30\times $?> across entire arc. We use hybrid parametric/non-parametric strong lensing mass model to compute deflection this giant arc,...
ABSTRACT We study the highly magnified arc SGAS J122651.3+215220 caused by a star-forming galaxy at zs = 2.93 crossing lensing caustic cast cluster SDSS J1226+2152 (zl 0.43), using Hubble Space Telescope observations. report in several asymmetric surface brightness features whose angular separations are fraction of an arcsecond from critical curve and appear to be but unequally image pairs underlying compact sources, with one brightest pair having clear asymmetry consistently across four...
We present gravitational-arc tomography of the cool-warm enriched circumgalactic medium (CGM) an isolated galaxy (``G1'') at $z \approx 0.77$. Combining VLT/MUSE adaptive-optics and Magellan/MagE echelle spectroscopy we obtain partially-resolved kinematics MgII in absorption [OII] emission. The unique arc configuration allows us to probe 42 spatially independent positions transverse G1, plus 4 front it. cover G1's minor major axes impact parameters $\approx 10-30$ kpc 60$ kpc, respectively....
Abstract We present a strong-lensing analysis of the cluster PSZ1 G311.65−18.48, based on Hubble Space Telescope imaging, archival VLT/MUSE spectroscopy, and Chandra X-ray data. This cool-core ( z = 0.443) lenses brightest lensed galaxy known, dubbed “Sunburst Arc” 2.3703), Lyman continuum (LyC) emitting multiply imaged 12 times. identify in this field 14 additional strongly galaxies to constrain strong-lens model report secure spectroscopic redshifts four them. measure projected core mass M...
ABSTRACT SDSS J2222+2745 is a galaxy cluster at z = 0.49, strongly lensing quasar 2.805 into six widely separated images. In recent Hubble Space Telescope imaging of the field, we identify additional multiply lensed galaxies and confirm sixth image that was identified by Dahle et al. We used Gemini-North telescope to measure spectroscopic redshift 4.56 one galaxies. These data are refine lens model J2222+2745, compute time delay magnifications images, reconstruct source host 2.3. This also...
Abstract We report the discovery of COOL J1241+2219, a strongly lensed galaxy at redshift z = 5.043 ± 0.002 with observed magnitude AB 20.47, by moderate-mass cluster 1.001 0.001. J1241+2219 is brightest currently known optical and near-infrared wavelengths ≳ 5; it ∼5 times brighter than prior record-holder galaxy, several magnitudes unlensed galaxies these redshifts. It was discovered as part COOL-LAMPS, collaboration initiated to find systems in recent public imaging data. characterize...