Search Publications
The ISLAndS Project. II. The Lifetime Star Formation Histories of Six Andomeda dSphS
Ferguson, Henry C.; McQuinn, Kristen B. W.; Dolphin, Andrew E. +17 more
The Initial Star formation and Lifetimes of Andromeda Satellites (ISLAndS) project employs Hubble Space Telescope imaging to study a representative sample of six Andromeda dSph satellite companion galaxies. Our main goal is to determine whether the star formation histories (SFHs) of the Andromeda dSph satellites demonstrate significant statistical…
Improved Dynamical Constraints on the Mass of the Central Black Hole in NGC 404
Williams, Benjamin F.; Caldwell, Nelson; Neumayer, Nadine +6 more
We explore the nucleus of the nearby 109 {M}⊙ early-type galaxy, NGC 404, using Hubble Space Telescope (HST)/STIS spectroscopy and WFC3 imaging. We first present evidence for nuclear variability in UV, optical, and infrared filters over a time period of 15 years. This variability adds to the already substantial evidence for …
A Complete ALMA Map of the Fomalhaut Debris Disk
MacGregor, Meredith A.; Hughes, A. Meredith; Kalas, Paul +14 more
We present ALMA mosaic observations at 1.3 mm (223 GHz) of the Fomalhaut system with a sensitivity of 14 µJy/beam. These observations provide the first millimeter map of the continuum dust emission from the complete outer debris disk with uniform sensitivity, enabling the first conclusive detection of apocenter glow. We adopt an MCMC modelin…
The Tip of the Red Giant Branch Distances to Typa Ia Supernova Host Galaxies. V. NGC 3021, NGC 3370, and NGC 1309 and the Value of the Hubble Constant
Lee, Myung Gyoon; Jang, In Sung
We present final results of a program for the determination of the Hubble constant based on the calibration of the Type Ia supernovae (SNe Ia) using the Tip of the Red Giant Branch (TRGB). We report TRGB distances to three SN Ia host galaxies, NGC 3021, NGC 3370, and NGC 1309. We obtain F555W and F814W photometry of resolved stars from the archiva…
Occurrence of Radio Minihalos in a Mass-limited Sample of Galaxy Clusters
Clarke, Tracy E.; Giacintucci, Simona; Venturi, Tiziana +3 more
We investigate the occurrence of radio minihalos—diffuse radio sources of unknown origin observed in the cores of some galaxy clusters—in a statistical sample of 58 clusters drawn from the Planck Sunyaev-Zel’dovich cluster catalog using a mass cut (M 500 > 6 × 1014 M ⊙). We supplement our statistical sample with…
ALMA [C II] 158 µm Detection of a Redshift 7 Lensed Galaxy behind RXJ1347.1-1145
Carilli, Chris; Fontana, Adriano; Treu, Tommaso +14 more
We present the results of ALMA spectroscopic follow-up of a z = 6.766 Lyα emitting galaxy behind the cluster RX J1347.1-1145. We report the detection of [C II] 158 µm line fully consistent with the Lyα redshift and with the peak of the optical emission. Given the magnification of µ = 5.0 ± 0.3, the intrinsic (corrected for lensing) lum…
Evidence for a Dayside Thermal Inversion and High Metallicity for the Hot Jupiter WASP-18b
Deming, Drake; Madhusudhan, Nikku; Gandhi, Siddharth +4 more
We find evidence for a strong thermal inversion in the dayside atmosphere of the highly irradiated hot Jupiter WASP-18b ({T}{eq}=2411 {{K}}, M=10.3 {M}J) based on emission spectroscopy from Hubble Space Telescope secondary eclipse observations and Spitzer eclipse photometry. We demonstrate a lack of water vapor in either abso…
Characterizing Intracluster Light in the Hubble Frontier Fields
Schmidt, Kasper B.; Treu, Tommaso; Vulcani, Benedetta +3 more
We investigate the intracluster light (ICL) in the six Hubble Frontier Field clusters at 0.3< z< 0.6. We employ a new method, which is free from any functional form of the ICL profile, and exploit the unprecedented depth of this Hubble Space Telescope imaging to map the ICL’s diffuse light out to clustrocentric radii R∼ 300 {kpc} ({µ }…
Extremely Small Sizes for Faint z ∼ 2-8 Galaxies in the Hubble Frontier Fields: A Key Input for Establishing Their Volume Density and UV Emissivity
Oesch, P. A.; Bouwens, R. J.; Illingworth, G. D. +3 more
We provide the first observational constraints on the sizes of the faintest galaxies lensed by the Hubble Frontier Fields (HFF) clusters. Ionizing radiation from faint galaxies likely drives cosmic reionization, and the HFF initiative provides a key opportunity to find such galaxies. However, we cannot assess their ionizing emissivity without a ro…
Panchromatic Hubble Andromeda Treasury. XVIII. The High-mass Truncation of the Star Cluster Mass Function
Dolphin, Andrew E.; Williams, Benjamin F.; Johnson, L. Clifton +7 more
We measure the mass function for a sample of 840 young star clusters with ages between 10 and 300 Myr observed by the Panchromatic Hubble Andromeda Treasury (PHAT) survey in M31. The data show clear evidence of a high-mass truncation: only 15 clusters more massive than {10}4 {M}⊙ are observed, compared to the ∼100 expected f…