Search Publications
An Updated Dust-to-Star Geometry: Dust Attenuation Does Not Depend on Inclination in 1.3 ≤z ≤2.6 Star-forming Galaxies from MOSDEF
Barro, Guillermo; Siana, Brian; Shapley, Alice E. +10 more
We investigate dust attenuation and its dependence on viewing angle for 308 star-forming galaxies at 1.3 ≤ z ≤ 2.6 from the MOSFIRE Deep Evolution Field survey. We divide galaxies with a detected Hα emission line and coverage of Hβ into eight groups by stellar mass, star formation rate (SFR), and inclination (i.e., axis ratio), and we then stack t…
A Multiwavelength Study of Active Galactic Nuclei in Post-merger Remnants
Li, Wenhao; Ryan, Russell; Drory, Niv +9 more
We investigate the role of galaxy mergers in triggering active galactic nuclei (AGN) in the nearby universe. Our analysis is based on a sample of 79 post-merger remnant galaxies with deep X-ray observations from Chandra/XMM-Newton capable of detecting a low-luminosity AGN of ≥1040.5 erg s-1. This sample is derived from a visu…
Similarity between Compact Extremely Red Objects Discovered with JWST in Cosmic Dawn and Blue-excess Dust-obscured Galaxies Known in Cosmic Noon
Inoue, Akio K.; Toba, Yoshiki; Nagao, Tohru +2 more
Spatially compact objects with extremely red color in the rest-frame optical to near-infrared (0.4-1 µm) and blue color in the rest-frame ultraviolet (UV; 0.2-0.4 µm) have been discovered at 5 < z < 9 using the James Webb Space Telescope (JWST). These extremely red objects (JWST-EROs) exhibit spectral energy distributions (SEDs) …
Identifying Tidal Disruption Events with an Expansion of the FLEET Machine-learning Algorithm
Villar, V. Ashley; van Velzen, Sjoert; Gezari, Suvi +5 more
We present an expansion of FLEET, a machine-learning algorithm optimized to select transients that are most likely tidal disruption events (TDEs). FLEET is based on a random forest algorithm trained on both the light curves and host galaxy information of 4779 spectroscopically classified transients. We find that for transients with a probability o…
A 1.3% Distance to M33 from Hubble Space Telescope Cepheid Photometry
Casertano, Stefano; Williams, Benjamin F.; Li, Siyang +7 more
We present a low-dispersion period-luminosity relation (PL) based on 154 Cepheids in Messier 33 (M33) with Hubble Space Telescope (HST) photometry from the PHATTER survey. Using high-quality ground-based light curves, we recover Cepheid phases and amplitudes for multi-epoch HST data and we perform template fitting to derive intensity-averaged mean…
DELVE 6: An Ancient, Ultra-faint Star Cluster on the Outskirts of the Magellanic Clouds
Geha, M.; James, D. J.; Kuropatkin, N. +24 more
We present the discovery of DELVE 6, an ultra-faint stellar system identified in the second data release of the DECam Local Volume Exploration (DELVE) survey. Based on a maximum-likelihood fit to its structure and stellar population, we find that DELVE 6 is an old (τ > 9.8 Gyr at 95% confidence) and metal-poor ([Fe/H] < -1.17 dex at 95% conf…
The Distribution of Metallicities in the Local Galactic Interstellar Medium
Jenkins, Edward B.; Savage, Blair D.; Shull, J. Michael +3 more
In this investigation, we present an analysis of the metallicity distribution that pertains to neutral gas in the local Galactic interstellar medium (ISM). We derive relative ISM metallicities for a sample of 84 sight lines probing diffuse atomic and molecular gas within 4 kpc of the Sun. Our analysis is based in large part on column density measu…
Hubble Constant Measurement from Three Large-separation Quasars Strongly Lensed by Galaxy Clusters
Mahler, Guillaume; Rigby, Jane R.; Bayliss, Matthew +5 more
Tension between cosmic microwave background-based and distance ladder-based determinations of the Hubble constant H 0 motivates the pursuit of independent methods that are not subject to the same systematic effects. A promising alternative, proposed by Refsdal in 1964, relies on the inverse scaling of H 0 with the delay betwe…
Constraints on the Dust Size Distributions in the HD 163296 Disk from the Difference of the Apparent Dust Ring Widths between Two ALMA Bands
Kataoka, Akimasa; Doi, Kiyoaki
The dust size in protoplanetary disks is a crucial parameter for understanding planet formation, while the observational constraints on dust size distribution have large uncertainties. In this study, we present a new method to constrain the dust size distribution from the dust spatial distribution, utilizing the fact that larger dust grains are mo…
Dependence of Cosmological Constraints on Gray Photometric Zero-point Uncertainties of Supernova Surveys
Riess, Adam G.; Stubbs, Christopher W.; Brout, Dillon +2 more
Type Ia supernova (SN) measurements of the Hubble constant, H 0; cosmic mass density, Ω M ; and dark energy equation-of-state parameter, w, rely on heterogeneous SN surveys across three decades of observation. These distinct surveys may have undiagnosed, relative photometric zero-point errors. We determine the sensitivities o…