635 citations · 2.5k across the 29 of their papers we have counts for
21 papers · 1 filter
Wide binaries in an ultra-faint dwarf galaxy: discovery, population modeling, and a nail in the coffin of primordial black hole dark matter
Cheyanne Shariat, Kareem El-Badry, Mario Gennaro +24
We report the discovery and characterization of a wide binary population in the ultrafaint dwarf galaxy Boötes I using deep JWST/NIRCam imaging. Our sample consists of 52 candidate…
Timing the r-Process Enrichment of the Ultra-Faint Dwarf Galaxy Reticulum II
Joshua D. Simon, Thomas M. Brown, Burçin Mutlu-Pakdil +65
The ultra-faint dwarf galaxy Reticulum II (Ret II) exhibits a unique chemical evolution history, with 72 +10/-12% of its stars strongly enhanced in r-process elements. We present d…
JWST reveals a possible galaxy merger in triply-lensed MACS0647JD
Tiger Yu-Yang Hsiao, Dan Coe, Abdurro'uf +63
MACS0647JD is a triply-lensed galaxy originally discovered with the Hubble Space Telescope. Here we report new JWST imaging, which clearly resolves MACS0647JD as ha…
A Highly Magnified Star at Redshift 6.2
Brian Welch, Dan Coe, Jose M. Diego +26
Galaxy clusters magnify background objects through strong gravitational lensing. Typical magnifications for lensed galaxies are factors of a few but can also be as high as tens or…
JWST Imaging of Earendel, the Extremely Magnified Star at Redshift
Brian Welch, Dan Coe, Erik Zackrisson +60
The gravitationally lensed star WHL0137-LS, nicknamed Earendel, was identified with a photometric redshift based on images taken with the Hubble Space Tele…
Eridanus II: A Fossil from Reionization with an Off-Center Star Cluster
Joshua D. Simon, Thomas M. Brown, Alex Drlica-Wagner +10
We present deep Hubble Space Telescope (HST) photometry of the ultra-faint dwarf galaxy Eridanus II (Eri II). Eri II, which has an absolute magnitude of M_V = -7.1, is located at a…
RELICS: Properties of z>5.5 Galaxies Inferred from Spitzer and Hubble Imaging Including A Candidate z~6.8 Strong [OIII] Emitter
Victoria Strait, Marusa Bradac, Dan Coe +26
We present constraints on the physical properties (including stellar mass, age, and star formation rate) of 207 galaxy candidates from the Reionization Lens…
Faint Stars in a Faint Galaxy: I. Ultra Deep Photometry of the Boötes I Ultra Faint Dwarf Galaxy
Carrie Filion, Vera Kozhurina-Platais, Roberto Avila +2
We present an analysis of new extremely deep images of the resolved stellar population of the Boötes I ultra faint dwarf spheroidal galaxy. These new data were taken with the Hubbl…
RELICS: Spectroscopy of gravitationally-lensed reionization-era analogs and implications for CIII] detections at
Ramesh Mainali, Daniel P Stark, Mengtao Tang +17
Recent observations have revealed the presence of strong CIII] emission (EW Å) in galaxies, the origin of which remains unclear. In an effort to understand…
Stellar Properties of z ~ 8 Galaxies in the Reionization Lensing Cluster Survey
Victoria Strait, Marusa Bradac, Dan Coe +18
Measurements of stellar properties of galaxies when the universe was less than one billion years old yield some of the only observational constraints of the onset of star formation…
RELICS: Reionization Lensing Cluster Survey
Dan Coe, Brett Salmon, Marusa Bradac +54
Large surveys of galaxy clusters with the Hubble and Spitzer Space Telescopes, including CLASH and the Frontier Fields, have demonstrated the power of strong gravitational lensing…
RELICS: Strong Lensing Analysis of MACS J0417.5-1154 and Predictions for Observing the Magnified High-Redshift Universe with JWST
Guillaume Mahler, Keren Sharon, Carter Fox +37
Strong gravitational lensing by clusters of galaxies probes the mass distribution at the core of each cluster and magnifies the universe behind it. MACS J0417.5-1154 at z=0.443 is…
The initial mass function in the Coma Berenices dwarf galaxy from deep near-infrared HST observations
Mario Gennaro, Marla Geha, Kirill Tchernyshyov +6
We use deep WFC3/IR imaging to study the Initial Mass Function (IMF) of the ultra faint dwarf galaxy Coma Berenices (Com Ber). Our observations reach the lowest stellar mass…
RELICS: A Strong Lens Model for SPT-CLJ0615-5746, a z=0.972 Cluster
Rachel Paterno-Mahler, Keren Sharon, Dan Coe +30
We present a lens model for the cluster SPT-CLJ06155746, which is the highest redshift () system in the Reionization of Lensing Clusters Survey (RELICS), making it the…
Chemically-dissected rotation curves of the Galactic Bulge from Main Sequence proper motions
William I. Clarkson, Annalisa Calamida, Kailash C. Sahu +9
We report results from an exploratory study implementing a new probe of Galactic evolution using archival Hubble Space Telescope imaging observations. Precise proper motions are co…
Evidence of a non universal stellar Initial Mass Function. Insights from HST optical imaging of 6 Ultra Faint Dwarf Milky Way Satellites
Mario Gennaro, Kirill Tchernyshyov, Thomas M. Brown +9
Using deep HST/ACS observations, we demonstrate that the sub-solar stellar initial mass function (IMF) of 6 ultra-faint dwarf Milky Way Satellites (UFDs) is more bottom light than…
A Candidate Galaxy Strongly Lensed into a Spatially Resolved Arc
Brett Salmon, Dan Coe, Larry Bradley +27
The most distant galaxies known are at z~10-11, observed 400-500 Myr after the Big Bang. The few z~10-11 candidates discovered to date have been exceptionally small- barely resolve…
RELICS: Strong Lens Models for Five Galaxy Clusters From the Reionization Lensing Cluster Survey
Catherine Cerny, Keren Sharon, Felipe Andrade-Santos +31
Strong gravitational lensing by galaxy clusters magnifies background galaxies, enhancing our ability to discover statistically significant samples of galaxies at z>6, in order to c…
The Reionization Lensing Cluster Survey (RELICS) and the Brightest High-z Galaxies
Brett Salmon, Dan Coe, Larry Bradley +31
Massive foreground galaxy clusters magnify and distort the light of objects behind them, permitting a view into both the extremely distant and intrinsically faint galaxy population…
The Frontier Fields: Survey Design
J. M. Lotz, A. Koekemoer, D. Coe +39
The Frontier Fields are a director's discretionary time campaign with HST and the Spitzer Space Telescope to see deeper into the universe than ever before. The Frontier Fields comb…
The Quenching of the Ultra-Faint Dwarf Galaxies in the Reionization Era
Thomas M. Brown, Jason Tumlinson, Marla Geha +11
We present new constraints on the star formation histories of six ultra-faint dwarf galaxies: Bootes I, Canes Venatici II, Coma Berenices, Hercules, Leo IV, and Ursa Major I. Our a…