Search Publications
Detection of the Far-infrared [O III] and Dust Emission in a Galaxy at Redshift 8.312: Early Metal Enrichment in the Heart of the Reionization Era
Shibuya, Takatoshi; Inoue, Akio K.; Hashimoto, Takuya +19 more
We present the Atacama Large Millimeter/submillimeter Array detection of the [O III] 88 µm line and rest-frame 90 µm dust continuum emission in a Y-dropout Lyman break galaxy (LBG), MACS0416_Y1 lying behind the Frontier Field cluster MACS J0416.1-2403. This [O III] detection confirms the LBG with a spectroscopic redshift of z = 8.3118 …
Compact Disks in a High-resolution ALMA Survey of Dust Structures in the Taurus Molecular Cloud
Pascucci, Ilaria; Edwards, Suzan; Banzatti, Andrea +24 more
We present a high-resolution (∼0.″12, ∼16 au, mean sensitivity of 50 µJy beam-1 at 225 GHz) snapshot survey of 32 protoplanetary disks around young stars with spectral type earlier than M3 in the Taurus star-forming region using the Atacama Large Millimeter Array. This sample includes most mid-infrared excess members that were not…
Constraining the Neutral Fraction of Hydrogen in the IGM at Redshift 7.5
Hoag, A.; Bradač, M.; Treu, T. +8 more
We present a large spectroscopic campaign with Keck/Multi-Object Spectrometer for InfraRed Exploration (MOSFIRE) targeting Lyα emission (Lyα) from intrinsically faint Lyman-break galaxies (LBGs) behind 12 efficient galaxy cluster lenses. Gravitational lensing allows us to probe the more abundant faint galaxy population to sensitive Lyα equivalent-…
RELICS: Reionization Lensing Cluster Survey
Ouchi, Masami; Mahler, Guillaume; Frye, Brenda L. +54 more
Large surveys of galaxy clusters with the Hubble Space Telescope (HST) and Spitzer, including the Cluster Lensing And Supernova survey with Hubble and the Frontier Fields, have demonstrated the power of strong gravitational lensing to efficiently deliver large samples of high-redshift galaxies. We extend this strategy through a wider, shallower su…
COSMOS-DASH: The Evolution of the Galaxy Size-Mass Relation since z ∼ 3 from New Wide-field WFC3 Imaging Combined with CANDELS/3D-HST
Franx, Marijn; Muzzin, Adam; van Dokkum, Pieter +11 more
We present COSMOS-Drift And SHift (DASH), a Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) imaging survey of the COSMOS field in the H 160 filter. The survey comprises 456 individual WFC3 pointings corresponding to an area of 0.49 deg2 (0.66 deg2 when including archival data) and reaches a 5σ point-source …
Consistent Calibration of the Tip of the Red Giant Branch in the Large Magellanic Cloud on the Hubble Space Telescope Photometric System and a Redetermination of the Hubble Constant
Casertano, Stefano; Riess, Adam G.; Yuan, Wenlong +2 more
We present a calibration of the tip of the red giant branch (TRGB) in the Large Magellanic Cloud (LMC) on the Hubble Space Telescope (HST)/ACS F814W system. We use archival HST observations to derive blending corrections and photometric transformations for two ground-based wide-area imaging surveys of the Magellanic Clouds. We show that these surv…
The Lyman Continuum Escape Survey: Ionizing Radiation from [O III]-strong Sources at a Redshift of 3.1
Tang, Mengtao; Stark, Daniel P.; Ellis, Richard S. +4 more
We present results from the LymAn Continuum Escape Survey (LACES), a Hubble Space Telescope (HST) program designed to characterize the ionizing radiation emerging from a sample of Lyα-emitting galaxies at redshift z ≃ 3.1. As many show intense [O III] emission characteristic of z > 6.5 star-forming galaxies, they may represent valuable low-reds…
Evidence for an Intermediate-mass Milky Way from Gaia DR2 Halo Globular Cluster Motions
van der Marel, Roeland P.; Watkins, Laura L.; Evans, N. Wyn +1 more
We estimate the mass of the Milky Way (MW) within 21.1 kpc using the kinematics of halo globular clusters (GCs) determined by Gaia. The second Gaia data release (DR2) contained a catalog of absolute proper motions (PMs) for a set of Galactic GCs and satellite galaxies. We select from the catalog only halo GCs, identifying a total of 34 GCs spannin…
A Second Galaxy Missing Dark Matter in the NGC 1052 Group
van Dokkum, Pieter; Romanowsky, Aaron J.; Conroy, Charlie +2 more
The ultra-diffuse galaxy NGC1052-DF2 has a very low velocity dispersion, indicating that it has little or no dark matter. Here we report the discovery of a second galaxy in this class, residing in the same group. NGC1052-DF4 closely resembles NGC1052-DF2 in terms of its size, surface brightness, and morphology; has a similar distance of {D}sb…
Observational Constraints on the Merger History of Galaxies since z ≈ 6: Probabilistic Galaxy Pair Counts in the CANDELS Fields
Pérez-González, Pablo G.; Grogin, Norman A.; Koekemoer, Anton M. +13 more
Galaxy mergers are expected to have a significant role in the mass assembly of galaxies in the early universe, but there are very few observational constraints on the merger history of galaxies at z > 2. We present the first study of galaxy major mergers (mass ratios <1:4) in mass-selected samples out to z ≈ 6. Using all five fields of the H…