Search Publications
A Spectroscopic Search for AGN Activity in the Reionization Era
Stark, Daniel P.; Ellis, Richard S.; Zitrin, Adi +4 more
The ubiquity of Lyman alpha (Lyα) emission in a sample of four bright [O III]-strong star-forming galaxies with redshifts above seven has led to the suggestion that such luminous sources represent a distinct population compared with their fainter, more numerous counterparts. The presence of Lyα emission within the reionization era could indicate t…
A Neutron Star Binary Merger Model for GW170817/GRB 170817A/SSS17a
Lee, W. H.; Rest, A.; Foley, R. J. +14 more
The merging neutron star gravitational-wave event GW170817 has been observed throughout the entire electromagnetic spectrum from radio waves to γ-rays. The resulting energetics, variability, and light curves are shown to be consistent with GW170817 originating from the merger of two neutron stars, in all likelihood followed by the prompt gravitati…
Bulge-forming Galaxies with an Extended Rotating Disk at z ~ 2
Übler, Hannah; Tamura, Yoichi; Kohno, Kotaro +24 more
We present 0.″2-resolution Atacama Large Millimeter/submillimeter Array observations at 870 µm for 25 Hα-seleced star-forming galaxies around the main sequence at z = 2.2-2.5. We detect significant 870 µm continuum emission in 16 (64%) of these galaxies. The high-resolution maps reveal that the dust emission is mostly radiated from a s…
A New, Large-scale Map of Interstellar Reddening Derived from H I Emission
Hensley, Brandon S.; Doré, Olivier; Lenz, Daniel
We present a new map of interstellar reddening, covering the 39% of the sky with low H I column densities (NHI< 4× 1020 cm-2 or E(B-V)≈ 45 mmag) at 16.1\prime resolution, based on all-sky observations of Galactic H I emission by the HI4PI Survey. In this low-column-density regime, we derive a characteristic valu…
The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. VIII. A Comparison to Cosmological Short-duration Gamma-Ray Bursts
Berger, E.; Rest, A.; Annis, J. +19 more
We present a comprehensive comparison of the properties of the radio through X-ray counterpart of GW170817 and the properties of short-duration gamma-ray bursts (GRBs). For this effort, we utilize a sample of 36 short GRBs spanning a redshift range of z≈ 0.12{--}2.6 discovered over 2004-2017. We find that the counterpart to GW170817 has an isotrop…
Predicting Quiescence: The Dependence of Specific Star Formation Rate on Galaxy Size and Central Density at 0.5 < z < 2.5
Giavalisco, Mauro; van Dokkum, Pieter G.; Franx, Marijn +9 more
In this paper, we investigate the relationship between star formation and structure, using a mass-complete sample of 27,893 galaxies at 0.5 < z < 2.5 selected from 3D-HST. We confirm that star-forming galaxies are larger than quiescent galaxies at fixed stellar mass ({M}\star ). However, in contrast with some simulations, there is…
Revisiting the Tale of Hercules: How Stars Orbiting the Lagrange Points Visit the Sun
Gerhard, Ortwin; Pérez-Villegas, Angeles; Wegg, Christopher +1 more
We propose a novel explanation for the Hercules stream consistent with recent measurements of the extent and pattern speed of the Galactic bar. We have adapted a made-to-measure dynamical model tailored for the Milky Way to investigate the kinematics of the solar neighborhood (SNd). The model matches the 3D density of the red clump giant stars (RC…
The State-of-the-art HST Astro-photometric Analysis of the Core of ω Centauri. I. The Catalog
Anderson, J.; Bedin, L. R.; King, I. R. +4 more
We have constructed the most comprehensive catalog of photometry and proper motions ever assembled for a globular cluster (GC). The core of ωCen has been imaged over 650 times through WFC3's UVIS and IR channels for the purpose of detector calibration. There exist from 4 to over 60 exposures through each of 26 filters stretching continuously from …
An ALMA Survey of CO Isotopologue Emission from Protoplanetary Disks in Chamaeleon I
Pascucci, Ilaria; Herczeg, Gregory J.; Henning, Thomas +8 more
The mass of a protoplanetary disk limits the formation and future growth of any planet. Masses of protoplanetary disks are usually calculated from measurements of the dust continuum emission by assuming an interstellar gas-to-dust ratio. To investigate the utility of CO as an alternate probe of disk mass, we use ALMA to survey 13CO and …
The Surface UV Environment on Planets Orbiting M Dwarfs: Implications for Prebiotic Chemistry and the Need for Experimental Follow-up
Ranjan, Sukrit; Sasselov, Dimitar D.; Wordsworth, Robin
Potentially habitable planets orbiting M dwarfs are of intense astrobiological interest because they are the only rocky worlds accessible to biosignature search over the next 10+ years because of a confluence of observational effects. Simultaneously, recent experimental and theoretical work suggests that UV light may have played a key role in the …