Search Publications
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 …
The Konus-Wind Catalog of Gamma-Ray Bursts with Known Redshifts. I. Bursts Detected in the Triggered Mode
Cline, T.; Hurley, K.; Golenetskii, S. +8 more
In this catalog, we present the results of a systematic study of gamma-ray bursts (GRBs) with reliable redshift estimates detected in the triggered mode of the Konus-Wind (KW) experiment during the period from 1997 February to 2016 June. The sample consists of 150 GRBs (including 12 short/hard bursts) and represents the largest set of cosmological…
X-Ray Morphological Analysis of the Planck ESZ Clusters
Lovisari, Lorenzo; Andrade-Santos, Felipe; Jones, Christine +7 more
X-ray observations show that galaxy clusters have a very large range of morphologies. The most disturbed systems, which are good to study how clusters form and grow and to test physical models, may potentially complicate cosmological studies because the cluster mass determination becomes more challenging. Thus, we need to understand the cluster pr…
Reverberation Mapping of Optical Emission Lines in Five Active Galaxies
Kim, S.; Kaspi, Shai; Kochanek, C. S. +68 more
We present the first results from an optical reverberation mapping campaign executed in 2014 targeting the active galactic nuclei (AGNs) MCG+08-11-011, NGC 2617, NGC 4051, 3C 382, and Mrk 374. Our targets have diverse and interesting observational properties, including a “changing look” AGN and a broad-line radio galaxy. Based on continuum-Hβ lags…
Pulsator-like Spectra from Ultraluminous X-Ray Sources and the Search for More Ultraluminous Pulsars
Mereghetti, S.; Stella, L.; Wolter, A. +3 more
Ultraluminous X-ray sources (ULXs) are a population of extragalactic objects whose luminosity exceeds the Eddington limit for a 10 M ⊙ black hole (BH). Their properties have been widely interpreted in terms of accreting stellar-mass or intermediate-mass BHs. However at least three neutron stars (NSs) have been recently identified in ULX…