Keely Finkelstein
A5086333753- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- History and Developments in Astronomy
- CCD and CMOS Imaging Sensors
- Remote Sensing in Agriculture
- Cosmology and Gravitation Theories
- Science Education and Perceptions
- Science Education and Pedagogy
- Human Mobility and Location-Based Analysis
- Biomedical and Engineering Education
- Photocathodes and Microchannel Plates
- Dark Matter and Cosmic Phenomena
- Impact of Light on Environment and Health
- Medical Education and Admissions
- Indigenous and Place-Based Education
- Scientific Research and Discoveries
- Genetics, Bioinformatics, and Biomedical Research
The University of Texas at Austin
2012-2024
Mitchell Institute
2010-2012
Texas A&M University
2010-2012
We report the discovery of a candidate galaxy with photo-z z~12 in first epoch JWST Cosmic Evolution Early Release Science (CEERS) Survey. Following conservative selection criteria we identify source robust z_phot = 11.8^+0.3_-0.2 (1-sigma uncertainty) m_F200W=27.3, and >7-sigma detections five filters. The is not detected at lambda < 1.4um deep imaging from both HST JWST, has faint ~3-sigma F150W F160W, which signal Ly-alpha break near red edge filters, implying z~12. This object (Maisie's...
Lyman Break Galaxy (LBG) candidates at z>10 are rapidly being identified in JWST/NIRCam observations. Due to the (redshifted) break produced by neutral hydrogen absorption of rest-frame UV photons, these sources expected drop out bluer filters while well detected redder filters. However, here we show that dust-enshrouded star-forming galaxies lower redshifts (z<7) may also mimic near-infrared (near-IR) colors LBGs, representing potential contaminants LBG candidate samples. First, analyze...
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 report the discovery of a galaxy cluster at z=1.62 located in Spitzer Wide-Area Infrared Extragalactic survey XMM-LSS field. This structure was selected solely as an overdensity galaxies with red Spitzer/IRAC colors, satisfying [3.6]-[4.5] > -0.1 AB mag. Photometric redshifts derived from Subaru XMM Deep Survey (BViz-bands), UKIRT Survey-Ultra-Deep (UKIDSS-UDS, JK-bands), and Public UDS (3.6-8.0 micron) show that this corresponds to surface density z ~ 1.6 is more than 20 sigma above mean...
We measure the rest-frame colors (dust-corrected), infrared luminosities, star formation rates, and stellar masses of 92 galaxies in a Spitzer-selected cluster at z=1.62. By fitting spectral energy distributions (SEDs) to 10-band photometry (0.4 micron < lambda(obs) <8 micron) measuring 24 fluxes for 12 spectroscopically confirmed 80 photometrically selected members, we discover an exceptionally high level core ~1700 Msun/yr per Mpc^2. The define strong blue sequence (U-V) color span range...
We discuss the structural and morphological properties of galaxies in a z = 1.62 proto-cluster using near-IR imaging data from Hubble Space Telescope Wide Field Camera 3 Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). The cluster exhibit clear color–morphology relation: with colors quiescent stellar populations generally have morphologies consistent spheroids, ongoing star formation disk-like irregular morphologies. size distribution shows deficit compact (≲ 1 kpc),...
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 The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey is a Hubble Space Telescope (HST) Cycle-26 Treasury Program, allocated in total 164 orbits primary Wide-Field Camera 3 Ultraviolet and VISible light F275W imaging with coordinated parallel Advanced for Surveys F435W imaging, on four five premier extragalactic fields: GOODS-N, GOODS-S, EGS, COSMOS. We introduce this by presenting comprehensive analysis absolute...
Abstract UVCANDELS is a Hubble Space Telescope Cycle-26 Treasury Program awarded 164 orbits of primary ultraviolet (UV) F275W imaging and coordinated parallel optical F435W in four CANDELS fields—GOODS-N, GOODS-S, EGS, COSMOS—covering total area ∼426 arcmin 2 . This ∼2.7 times larger than the covered by previous deep-field space UV data combined, reaching depth about 27 28 ABmag (5 σ 0.”2 apertures) for F435W, respectively. Along with new photometric catalogs, we present an analysis...
Abstract The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey provided ultraviolet F275W imaging with coordinated parallel optical F435W in four five CANDELS fields: GOODS-N, GOODS-S, EGS, and COSMOS, covering a total area ∼426 arcmin 2 . UVCANDELS takes primary WFC3/UVIS exposures at uniform 3-orbit depth ACS (in parallel) slightly varying due to roll angle constraints overlap from increased field view camera, reaching...
We present the highest redshift detections of resolved Lyman alpha emission, using Hubble Space Telescope/ACS F658N narrowband-imaging data taken in parallel with Wide Field Camera 3 Early Release Science program GOODS CDF-S. detect emission from three spectroscopically confirmed z = 4.4 emitting galaxies (LAEs), more than doubling sample LAEs emission. Comparing light distribution between rest-frame ultraviolet continuum and narrowband images, we investigate escape photons at high redshift....
Ly{\alpha} line EWs provide important clues to the physical nature of high redshift LAEs. However, measuring EW distribution high-z narrowband selected LAEs can be hard because many sources do not have broadband photometry. We investigate possible biases in intrinsic for a LAE sample at z $\sim$ 4.5 Extended CDFS. Only weak Malmquist-type bias both luminosity function and were found. observed is severely biased if one only considers with detections continuum. Taking non-detections into...
We present the results of an unbiased search for Ly{\alpha} emission from continuum-selected 6 < z 8 galaxies. Our dataset consists 160 orbits G102 slitless grism spectroscopy obtained with Hubble Space Telescope (HST) Wide Field Camera 3 as part Faint Infrared Grism Survey (FIGS; PI: Malhotra), which obtains deep spectra all sources in four fields, and was designed to minimize contamination observations previously-identified high-redshift galaxy candidates. The FIGS data can potentially...
We present a spectroscopically confirmed sample of Lyman α emitting galaxies (LAEs) at z ∼ 4.5 in the Extended Chandra Deep Field-South (ECDFS), which we combine with LAEs from previous narrow-band surveys Large Area Alpha (LALA) survey to build unified Lyα luminosity function. observed 64 candidate ECDFS, confirming 46 objects as based on single-line detections no continuum emission bluewards line, resulting confirmation rate ∼70 per cent. did not detect significant flux neither C iv λ1549...
Abstract The UltraViolet imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) program provides deep Hubble Space Telescope (HST) F275W and F435W over four CANDELS fields (GOODS-N, GOODS-S, COSMOS, Extended Groth Strip). We combine this newly acquired UV with existing HST from as well ancillary data to obtain robust photometric redshifts reliable estimates for galaxy physical properties 150,000 galaxies in ∼430 arcmin 2 UVCANDELS area. Here, we...
We present the analysis of Herschel SPIRE far-infrared (FIR) observations z = 2.515 lensed galaxy SMM J163554.2+661225. Combining new 250, 350, and 500 micron with existing data, we make an improved fit to FIR spectral energy distribution (SED) this galaxy. find a total infrared (IR) luminosity L(8--1000 micron) 6.9 +/- 0.6x10^11 Lsol; factor 3 more precise over previous L_IR estimates for galaxy, one most accurate measurements any at these redshifts. This implies unlensed star formation...
We present the results from a stellar population modeling analysis of sample 162 z = 4.5 and 14 5.7 Lyα emitting galaxies (LAEs) in Boötes field, using deep Spitzer/IRAC data at 3.6 μm Spitzer Survey, along with Hubble Space Telescope NICMOS WFC3 imaging 1.1 1.6 for subset LAEs. This represents one largest samples high-redshift LAEs imaged IRAC. find that 30/162 (19%) 9/14 (64%) are detected ≥3σ least IRAC band. Individual IRAC-detected have large range mass, 5 × 108–1011 . One-third older...
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 report the discovery of a candidate galaxy with photo-z z~12 in first epoch JWST Cosmic Evolution Early Release Science (CEERS) Survey. Following conservative selection criteria we identify source robust z_phot = 11.8^+0.3_-0.2 (1-sigma uncertainty) m_F200W=27.3, and >7-sigma detections five filters. The is not detected at lambda < 1.4um deep imaging from both HST JWST, has faint ~3-sigma F150W F160W, which signal Ly-alpha break near red edge filters, implying z~12. This object...
We report the first X-ray detection of 113 Lyman-alpha emitters at redshift z ~ 4.5. Only one source (J033127.2-274247) is detected in Extended Chandra Deep Field South (ECDF-S) data, and has been spectroscopically confirmed as a = 4.48 quasar with $L_X 4.2\times 10^{44}$ erg/s. The single gives density consistent luminosity function quasars. coadded counts 22 (LAEs) central (CDF-S) region yields S/N=2.4 (p=99.83%) soft band, an effective exposure time ~36 Ms. Further analysis equivalent...
Abstract We present analysis using a citizen science campaign to improve the cosmological measures from Hobby–Eberly Telescope Dark Energy Experiment (HETDEX). The goal of HETDEX is measure Hubble expansion rate, H ( z ), and angular diameter distance, D A at = 2.4, each percent-level accuracy. This accuracy determined primarily total number detected Ly α emitters (LAEs), false positive rate due noise, contamination [O ii ] emitting galaxies. paper presents project, Explorers...
We present the discovery and detailed multi-wavelength study of a strongly lensed luminous infrared galaxy at z = 0.816. Unlike most known galaxies discovered optical or near-infrared wavelengths, this source is red, (r − Ks)AB 3.9, which data presented here demonstrate due to ongoing dusty star formation. The overall lensing magnification (a factor 17) facilitates observations from blue through 500 μm, fully capturing both stellar photospheric emission re-processed thermal dust emission....
We report on two regularly rotating galaxies at redshift z=2, using high resolution spectra of the bright [CII] 158 micron emission line from HIFI instrument Herschel Space Observatory. Both SDSS090122.37+181432.3 ("S0901") and SDSS J120602.09+514229.5 ("the Clone") are strongly lensed show double-horned profile that is typical gas disks. Using a parametric disk model to fit profiles, we find S0901 has rotation speed v sin(i) = 120 +/- 7 km/s velocity dispersion sigma < 23 km/s. The best...
We observed the [C ii] line in 15 lensed galaxies at redshifts 1 < z 3 using HIFI on Herschel Space Observatory and detected 14/15 3σ or better. High magnifications enable even modestly luminous to be with Herschel. The luminosity this sample ranges from 8 × 107 L⊙ 3.7 109 (after correcting for magnification), confirming that is a strong tracer of ISM high redshifts. ratio total far-infrared (FIR) serves as measure gas dust cooling thus efficiency grain photoelectric heating process. It...