Search Publications
On the Stellar Populations of Galaxies at z = 9-11: The Growth of Metals and Stellar Mass at Early Times
Papovich, Casey; Finkelstein, Steven L.; Dickinson, Mark +18 more
We present a detailed stellar population analysis of 11 bright (H < 26.6) galaxies at z = 9-11 (three spectroscopically confirmed) to constrain the chemical enrichment and growth of stellar mass of early galaxies. We use the flexible Bayesian spectral energy distribution (SED) fitting code Prospector with a range of star formation histories (SF…
A time-resolved picture of our Milky Way's early formation history
Xiang, Maosheng; Rix, Hans-Walter
The formation of our Milky Way can be split up qualitatively into different phases that resulted in its structurally different stellar populations: the halo and the disk components1-3. Revealing a quantitative overall picture of our Galaxy's assembly requires a large sample of stars with very precise ages. Here we report an analysis of …
An Isolated Stellar-mass Black Hole Detected through Astrometric Microlensing
Ferguson, Henry C.; Brown, Thomas M.; Casertano, Stefano +91 more
We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). We used the Hubble Space Telescope (HST) to carry out precise astrometry of the source star of the long-duration (t E ≃ 270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462 (hereafter designated as …
First look with JWST spectroscopy: Resemblance among z ∼ 8 galaxies and local analogs
Schaerer, D.; Marques-Chaves, R.; Brammer, G. +5 more
Deep images and near-IR spectra of galaxies in the field of the lensing cluster SMACS J0723.3−7327 were recently taken as part of the Early Release Observations (EROs) program of the James Webb Space Telescope (JWST). Among these, two NIRSpec spectra of galaxies, at z = 7.7 and at z = 8.5, were obtained, revealing, for the first time, the rest-fra…
The Low-redshift Lyman Continuum Survey. I. New, Diverse Local Lyman Continuum Emitters
Papovich, Casey; Finkelstein, Steven L.; Santini, Paola +44 more
The origins of Lyman continuum (LyC) photons responsible for the reionization of the universe are as of yet unknown and highly contested. Detecting LyC photons from the Epoch of Reionization is not possible due to absorption by the intergalactic medium, which has prompted the development of several indirect diagnostics to infer the rate at which g…
Star formation near the Sun is driven by expansion of the Local Bubble
Alves, João; Speagle, Joshua S.; Zucker, Catherine +8 more
For decades we have known that the Sun lies within the Local Bubble, a cavity of low-density, high-temperature plasma surrounded by a shell of cold, neutral gas and dust1-3. However, the precise shape and extent of this shell4,5, the impetus and timescale for its formation6,7, and its relationship to nearby star fo…
Fast, Slow, Early, Late: Quenching Massive Galaxies at z ∼ 0.8
Barro, Guillermo; van Dokkum, Pieter; Conroy, Charlie +14 more
We investigate the stellar populations for a sample of 161 massive, mainly quiescent galaxies at <z obs> = 0.8 with deep Keck/DEIMOS rest-frame optical spectroscopy (HALO7D survey). With the fully Bayesian framework Prospector, we simultaneously fit the spectroscopic and photometric data with an advanced physical model (including …
The Global Dynamical Atlas of the Milky Way Mergers: Constraints from Gaia EDR3-based Orbits of Globular Clusters, Stellar Streams, and Satellite Galaxies
Sharma, Sanjib; Malhan, Khyati; Ibata, Rodrigo A. +7 more
The Milky Way halo was predominantly formed by the merging of numerous progenitor galaxies. However, our knowledge of this process is still incomplete, especially in regard to the total number of mergers, their global dynamical properties and their contribution to the stellar population of the Galactic halo. Here, we uncover the Milky Way mergers …
TESS Eclipsing Binary Stars. I. Short-cadence Observations of 4584 Eclipsing Binaries in Sectors 1-26
Powell, Brian P.; Gagliano, Robert; Kristiansen, Martti H. +44 more
In this paper we present a catalog of 4584 eclipsing binaries observed during the first two years (26 sectors) of the TESS survey. We discuss selection criteria for eclipsing binary candidates, detection of hitherto unknown eclipsing systems, determination of the ephemerides, the validation and triage process, and the derivation of heuristic estim…
The Low-redshift Lyman Continuum Survey. II. New Insights into LyC Diagnostics
Papovich, Casey; Finkelstein, Steven L.; Santini, Paola +43 more
The Lyman continuum (LyC) cannot be observed at the epoch of reionization (z ≳ 6) owing to intergalactic H I absorption. To identify LyC emitters (LCEs) and infer the fraction of escaping LyC, astronomers have developed various indirect diagnostics of LyC escape. Using measurements of the LyC from the Low-redshift Lyman Continuum Survey (LzLCS), w…