Ryan Endsley
A5083229179- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- CCD and CMOS Imaging Sensors
- Photocathodes and Microchannel Plates
- Cosmology and Gravitation Theories
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Immunotherapy and Immune Responses
- Astro and Planetary Science
- Superconducting and THz Device Technology
- Advanced Optical Sensing Technologies
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Computational Physics and Python Applications
- Planetary Science and Exploration
The University of Texas at Austin
2022-2024
University of Arizona
2018-2023
Washington University in St. Louis
2013-2015
Special Olympics
2013
Screen
2013
We present JADES JWST/NIRSpec spectroscopy of GN-z11, the most luminous candidate z > 10 Lyman break galaxy in GOODS-North field with M UV = −21.5. derive a redshift 10.603 (lower than previous determinations) based on multiple emission lines our low and medium resolution spectra over 0.7 − 5.3 μm. significantly detect continuum measure blue rest-UV spectral slope β −2.4. Remarkably, we see spatially extended Lyman- α (despite highly neutral intergalactic expected at this early epoch),...
We quantify the distribution of [OIII]+H$\beta$ line strengths at z$\simeq$7 using a sample 20 bright (M$_{\mathrm{UV}}$ $\lesssim$ $-$21) galaxies. select these systems over wide-area fields (2.3 deg$^2$ total) new colour-selection which precisely selects galaxies z$\simeq$6.63$-$6.83, redshift range where blue Spitzer/IRAC [3.6]$-$[4.5] colours unambiguously indicate strong [OIII]$+$H$\beta$ emission. These suggest log-normal EW with median = 759$^{+112}_{-113}$ $\mathrm{\mathring{A}}$ and...
Abstract The Reionization Era Bright Emission Line Survey (REBELS) is a cycle-7 ALMA Large Program (LP) that identifying and performing first characterization of many the most luminous star-forming galaxies known in z > 6.5 universe. REBELS providing this probe by systematically scanning 40 brightest UV-selected identified over 7 deg 2 area for bright [C ii ] 158 μ m [O iii 88 lines dust-continuum emission. Selection targets was done combining our own other photometric selections, each...
Spitzer/IRAC imaging has revealed that the brightest $z\sim7-8$ galaxies often exhibit young ages and strong nebular line emission, hinting at high ionizing efficiency among early galaxies. However, IRAC's limited sensitivity long hindered efforts to study fainter, more numerous population thought largely responsible for reionization. Here we use CEERS JWST/NIRCam data characterize 116 UV-faint (median M$_{UV}=-19.5$) $z\sim6.5-8$ The SEDs are typically dominated by ($\sim$10-50 Myr),...
ABSTRACT We describe new JWST/NIRSpec observations of galaxies at z ≳ 7 taken from the CEERS survey. Previous this area have revealed associations Lyα emitters redshifts (z = 7.5, 7.7, and 8.7) where intergalactic medium (IGM) is thought to be mostly neutral, leading suggestions that these systems are situated in large ionized bubbles. identify 21 with robust data set, including 10 associations. Their spectra indicative very highly metal poor gas, line ratios (O32 17.84 Ne3O2 0.89, linear...
We present JWST NIRCam 9-band near-infrared imaging of the luminous $z=10.6$ galaxy GN-z11 from Advanced Deep Extragalactic Survey (JADES) GOODS-N field. find a spectral energy distribution (SED) entirely consistent with expected form high-redshift galaxy: clear blue continuum 1.5 to 4 microns complete dropout in F115W. The core is extremely compact imaging. analyze image two-component model, using point source and S\'{e}rsic profile that fits half-light radius 200 pc an index $n=0.9$....
ABSTRACT We present the JWST cycle 1 53.8 h medium program FRESCO, short for ‘First Reionization Epoch Spectroscopically Complete Observations’. FRESCO covers 62 arcmin2 in each of two GOODS/CANDELS fields a total area 124 exploiting JWST’s powerful new grism spectroscopic capabilities at near-infrared wavelengths. By obtaining ∼2 deep NIRCam/grism observations with F444W filter, yields unprecedented spectra R ∼ 1600 covering 3.8–5.0 µm most galaxies NIRCam field view. This setup enables...
Abstract JWST has revolutionized the field of extragalactic astronomy with its sensitive and high-resolution infrared view distant Universe. Adding to new legacy observations, we present first NIRCam imaging data release from Advanced Deep Extragalactic Survey (JADES), providing nine filters ∼25 arcmin 2 covering Hubble Ultra Field portions Great Observatories Origins South. Utilizing 87 on-sky dual-filter hours exposure time, these images reveal deepest ever near-infrared this iconic field....
ALMA observations have revealed the presence of dust in first generations galaxies Universe. However, temperature $T_d$ remains mostly unconstrained due to few available FIR continuum data at redshift $z>5$. This introduces large uncertainties several properties high-$z$ galaxies, namely their masses, infrared luminosities, and obscured fraction star formation. Using a new method based on simultaneous [CII] 158$\mu$m line underlying measurements, we derive $T_ d$ detected $z\approx 7$ Large...
ABSTRACT We include a fully coupled treatment of metal and dust enrichment into the Delphi semi-analytic model galaxy formation to explain content 13 Lyman break galaxies (LBGs) detected by Atacama Large millimetre Array (ALMA) REBELS Program at z ≃ 7. find that mass, Md, is regulated combination Type II supernova production, astration, shock destruction, ejection in outflows; grain growth (with standard time-scale τ0 = 30 Myr) plays negligible role. The predicts dust-to-stellar mass ratio...
We report 18 dust continuum detections ($\geq 3.3\sigma$) at $\sim88{\rm \mu m}$ and $158{\rm out of 49 ultraviolet(UV)-bright galaxies ($M_{\rm UV} < -21.3$ mag) $z>6.5$, observed by the Cycle-7 ALMA Large Program, REBELS its pilot programs. This has more than tripled number known $z>6.5$. Out these detections, 12 are reported for first time as part REBELS. In addition, 15 detected also show a [CII]$_{\rm 158{\rm m}}$ emission line, providing us with accurate redshifts. anticipate line from...
ABSTRACT We present specific star formation rates (sSFRs) for 40 ultraviolet (UV)-bright galaxies at z ∼ 7–8 observed as part of the Reionization Era Bright Emission Line Survey (REBELS) Atacama Large Millimeter/submillimeter Array (ALMA) large programme. The sSFRs are derived using improved rate (SFR) calibrations and spectral energy distribution (SED)-based stellar masses, made possible by measurements far-infrared (FIR) continuum emission [C ii]-based spectroscopic redshifts. median sSFR...
The variety of star formation histories (SFHs) $z\gtrsim6$ galaxies provides important insights into early formation, but has been difficult to systematically quantify. Some observations suggest that many $z\sim6-9$ are dominated by $\gtrsim200$ Myr stellar populations, implying significant at $z\gtrsim9$, while others find most reionization era $\lesssim10$ Myr, consistent with little $z\gtrsim9$ formation. Here, we quantify the distribution ages UV-bright ($-22.5\lesssim...
Abstract We present a catalog of 717 candidate galaxies at z > 8 selected from 125 square arcmin NIRCam imaging as part the JWST Advanced Deep Extragalactic Survey (JADES). combine full JADES data set with Medium and First Reionization Epoch Spectroscopic COmplete (FRESCO) along extremely deep existing observations Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) final filter that includes 15 JWST/NIRCam filters five HST/ACS filters. The high-redshift galaxy candidates were...
Abstract Recent JWST/NIRCam imaging taken for the ultra-deep UNCOVER program reveals a very red dropout object at z phot ≃ 7.6, triply imaged by galaxy cluster A2744 ( d = 0.308). All three images are compact, i.e., unresolved, with delensed size upper limit of r e ≲ 35 pc. The have apparent magnitudes m F444W ∼ 25−26 AB, and magnification-corrected absolute UV magnitude source is M UV,1450 −16.81 ± 0.09. From sum observed fluxes from spectral energy distribution (SED) analysis, we obtain...
We present the first results from JWST ASPIRE program (A SPectroscopic survey of biased halos In Reionization Era). This represents an imaging and spectroscopic 25 reionization-era quasars their environments by utilizing unprecedented capabilities NIRCam Wide Field Slitless Spectroscopy (WFSS) mode. will deliver largest ($\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...
We present JADES JWST/NIRSpec spectroscopy of GN-z11, the most luminous candidate $z>10$ Lyman break galaxy in GOODS-North field with $M_{UV}=-21.5$. derive a redshift $z=10.603$ (lower than previous determinations) based on multiple emission lines our low and medium resolution spectra over $0.8-5.3 μ$m. significantly detect continuum measure blue rest-UV spectral slope $β=-2.4$. Remarkably, we see spatially-extended Lyman-$α$ (despite highly-neutral IGM expected at this early epoch),...
We present an overview of the James Webb Space Telescope (JWST) Advanced Deep Extragalactic Survey (JADES), ambitious program infrared imaging and spectroscopy in GOODS-S GOODS-N deep fields, designed to study galaxy evolution from high redshift cosmic noon. JADES uses about 770 hours Cycle 1 guaranteed time largely Near-Infrared Camera (NIRCam) Spectrograph (NIRSpec) instrument teams. In GOODS-S, around Hubble Ultra Field Chandra South, produces a region ~45 arcmin$^2$ with average 130 hrs...
ABSTRACT Nearly a decade ago, we began to see indications that reionization-era galaxies power hard radiation fields rarely seen at lower redshift. Most striking were detections of nebular C iv emission in what appeared be typical low-mass galaxies, requiring an ample supply 48 eV photons triply ionize carbon. We have obtained deep JWST/NIRSpec R = 1000 spectroscopy the two z &gt; 6 iv-emitting known prior JWST. Here, present rest-UV optical spectrum one these systems, multiply-imaged...
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...
We describe the NIRSpec component of JWST Deep Extragalactic Survey (JADES), and provide deep spectroscopy 253 sources targeted with micro-shutter assembly in Hubble Ultra Field surrounding GOODS-South. The multi-object spectra presented here are deepest so far obtained JWST, amounting to up 28 hours low-dispersion ($R 30-300$) prism, 7 each three medium-resolution $R 1000$ gratings one high-dispersion grating, G395H Our medium-dispersion cover wavelength range $0.6-5.3\ selection...
We present the properties of 17 faint Lyman- α emitting galaxies (LAEs) at z > 5.8 from JWST Advanced Deep Extragalactic Survey (JADES) spectroscopic data in Hubble Ultra Field/GOODS-S. These LAEs span a redshift range ≈ − 8.0 and UV magnitude M −17 to −20.6, with Ly equivalent width (EW) ≈25 350 Å. The detection other rest-optical emission lines spectra these enables determination accurate systemic redshifts velocity offsets, as well physical chemical composition their stars interstellar...