Publications (30)
Spectroscopic detection of CIV in a galaxy at z=7.045: Implications for the ionizing spectra of reionization-era galaxies
Daniel P. Stark, Gregory Walth, Stephane Charlot +9
We present Keck/MOSFIRE observations of UV metal lines in four bright gravitationally-lensed z~6-8 galaxies behind the cluster Abell 1703. The spectrum of A1703-zd6, a highly-magni…
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…
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…
Spectroscopy of CASSOWARY gravitationally-lensed galaxies in SDSS: characterisation of an extremely bright reionization-era analog at
Ramesh Mainali, Daniel P. Stark, Tucker Jones +3
We present new observations of sixteen bright () gravitationally lensed galaxies at selected from the CASSOWARY survey. Included in our sample is the $z=1.42…
UV Diagnostics of Galaxies from the Peak of Star-Formation to the Epoch of Reionization
Casey Papovich, Dan Stark, Steve Finkelstein +19
The rest-frame UV emission from massive stars contains a wealth of information about the physical nature and conditions of star formation in galaxies. Using studies of the rest-fra…
A variable active galactic nucleus at triply-imaged by the galaxy cluster MACS J0035.4-2015
Lukas J. Furtak, Ramesh Mainali, Adi Zitrin +32
We report the discovery of a triply imaged active galactic nucleus (AGN), lensed by the galaxy cluster MACS J0035.4-2015 (). The object is detected in Hubble…
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 Ã ) in galaxies, the origin of which remains unclear. In an effort to understand…
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…
The Cosmic Telescope that Lenses the Sunburst Arc, PSZ1 G311.65-18.48: Strong Gravitational Lensing model and Source Plane Analysis
Keren Sharon, Guillaume Mahler, T. Emil Rivera-Thorsen +12
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-c…
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…
A spectroscopic search for AGN activity in the reionization era
Nicolas Laporte, Kimihiko Nakajima, Richard S. Ellis +4
The ubiquity of Lyman alpha (Ly) emission in a sample of four bright [O III]-strong star-forming galaxies with redshifts above 7 has led to the suggestion that such luminous so…
Spectroscopic Constraints on UV Metal Line Emission at z~6-9: The Nature of Lyman-alpha Emitting Galaxies in the Reionization-Era
Ramesh Mainali, Adi Zitrin, Daniel P. Stark +6
Recent studies have revealed intense UV metal emission lines in a modest sample of z>7 Lyman-alpha emitters, indicating a hard ionizing spectrum is present. If such high ionization…
Metal-poor star formation at with JWST: new insight into hard radiation fields and nitrogen enrichment on 20 pc scales
Michael W. Topping, Daniel P. Stark, Peter Senchyna +11
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…
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…
RELICS: Strong-lensing analysis of the massive clusters MACS J0308.9+2645 and PLCK G171.9-40.7
Ana Acebron, Nathália Cibirka, Adi Zitrin +37
Strong gravitational lensing by galaxy clusters has become a powerful tool for probing the high-redshift Universe, magnifying distant and faint background galaxies. Reliable strong…
RELICS: High-Resolution Constraints on the Inner Mass Distribution of the z=0.83 Merging Cluster RXJ0152.7-1357 from strong lensing
Ana Acebron, May Alon, Adi Zitrin +37
Strong gravitational lensing (SL) is a powerful means to map the distribution of dark matter. In this work, we perform a SL analysis of the prominent X-ray cluster RXJ0152.7-1357 (…
The connection between galactic outflows and the escape of ionizing photons
Ramesh Mainali, Jane R. Rigby, John Chisholm +13
We analyze spectra of a gravitationally lensed galaxy, known as the Sunburst Arc, that is leaking ionizing photons, also known as the Lyman continuum (LyC). Magnification from grav…
Physical properties and H-ionizing-photon production rates of extreme nearby star-forming regions
Jacopo Chevallard, Stéphane Charlot, Peter Senchyna +7
Measurements of the galaxy UV luminosity function at z>6 suggest that young stars hosted in low-mass star-forming galaxies produced the bulk of hydrogen-ionizing photons necessary…
Ultraviolet spectra of extreme nearby star-forming regions --- approaching a local reference sample for JWST
Peter Senchyna, Daniel P. Stark, Alba Vidal-GarcÃa +7
Nearby dwarf galaxies provide a unique laboratory in which to test stellar population models below . Such tests are particularly important for interpreting the surprisin…
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…
A bright lensed galaxy at with strong Ly emission
Ian D. McGreer, Benjamin Clément, Ramesh Mainali +10
We present a detailed study of a unusually bright, lensed galaxy at discovered within the CFHTLS imaging survey. With an observed flux of , J141446.82+54…
Deep rest-UV JWST/NIRSpec spectroscopy of early galaxies: the demographics of CIV and N-emitters in the reionization era
Michael W. Topping, Daniel P. Stark, Peter Senchyna +12
JWST has recently discovered a subset of reionization era galaxies with ionized gas that is metal poor in oxygen and carbon but heavily-enriched in nitrogen. This abundance pattern…
RELICS-DP7: Spectroscopic Confirmation of a Dichromatic Primeval Galaxy at z ~ 7
Debora Pelliccia, Victoria Strait, Brian C. Lemaux +12
We report the discovery of a spectroscopically-confirmed strong Lyman- emitter at , observed as part of the Reionization Cluster Lensing Survey (RELICS). Thi…
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: A Very Large () Cluster Lens -- RXC J0032.1+1808
Ana Acebron, Adi Zitrin, Dan Coe +38
Extensive surveys with the \textit{Hubble Space Telescope} (HST) over the past decade, targeting some of the most massive clusters in the sky, have uncovered dozens of galaxy-clust…
RELICS: Strong Lensing analysis of the galaxy clusters Abell S295, Abell 697, MACS J0025.4-1222, and MACS J0159.8-0849
Nathália Cibirka, Ana Acebron, Adi Zitrin +37
We present a strong-lensing analysis of four massive galaxy clusters imaged with the Hubble Space Telescope in the Reionization Lensing Cluster Survey. We use a Light-Traces-Mass t…
Small Region, Big Impact: Highly Anisotropic Lyman-continuum Escape from a Compact Starburst Region with Extreme Physical Properties
Keunho J. Kim, Matthew B. Bayliss, Jane R. Rigby +13
Extreme, young stellar populations are considered the primary contributor to cosmic re-ionization. How Lyman-continuum (LyC) escapes these galaxies remains highly elusive, and it i…
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…
Evidence for a Hard Ionizing Spectrum from a z=6.11 Stellar Population
Ramesh Mainali, Juna A. Kollmeier, Daniel P. Stark +4
We present the Magellan/FIRE detection of highly-ionized CIV 1550 and OIII] 1666 in a deep infrared spectrum of the z=6.11 gravitationally lensed low-mass galaxy RXC J2248.7-4431-I…
Lyman-alpha and CIII] Emission in z=7-9 Galaxies: Accelerated Reionization Around Luminous Star Forming Systems?
Daniel P. Stark, Richard S. Ellis, Stephane Charlot +9
We discuss new Keck/MOSFIRE spectroscopic observations of four luminous galaxies at z~7-9 selected to have intense optical line emission by Roberts-Borsani et al. (2016). Previous…