Search Publications
The MAVERIC Survey: Still No Evidence for Accreting Intermediate-mass Black Holes in Globular Clusters
Strader, Jay; Maccarone, Thomas J.; Seth, Anil C. +8 more
We present the results of an ultradeep, comprehensive radio continuum survey for the accretion signatures of intermediate-mass black holes (IMBHs) in globular clusters (GCs). The sample, imaged with the Karl G. Jansky Very Large Array and the Australia Telescope Compact Array, comprises 50 Galactic GCs. No compelling evidence for an IMBH is found …
A Survey of Atomic Carbon [C I] in High-redshift Main-sequence Galaxies
Dickinson, Mark E.; Lee, Min-Young; Daddi, Emanuele +15 more
We present the first results of an Atacama Large Millimeter Array survey of the lower fine-structure line of atomic carbon [C I] {(}3{P}1 {--}{}3{P}0) in far-infrared-selected galaxies on the main sequence at z ∼ 1.2 in the COSMOS field. We compare our sample with a comprehensive compilation of data avai…
Multiple Disk Gaps and Rings Generated by a Single Super-Earth. II. Spacings, Depths, and Number of Gaps, with Application to Real Systems
Dong, Ruobing; Li, Hui; Chiang, Eugene +1 more
The Atacama Large Millimeter/submillimeter Array (ALMA) has found multiple dust gaps and rings in a number of protoplanetary disks in continuum emission at millimeter wavelengths. The origin of such structures is under debate. Recently, we documented how one super-Earth planet can open multiple (up to five) dust gaps in a disk with low viscosity (…
GRB 170817A Associated with GW170817: Multi-frequency Observations and Modeling of Prompt Gamma-Ray Emission
Lyutikov, M.; Minaev, P. Yu.; Pozanenko, A. S. +7 more
We present our observations of electromagnetic transients associated with GW170817/GRB 170817A using optical telescopes of Chilescope observatory and Big Scanning Antenna (BSA) of Pushchino Radio Astronomy Observatory at 110 MHz. The Chilescope observatory detected an optical transient of ∼19m on the third day in the outskirts of the ga…
Mapping Distances across the Perseus Molecular Cloud Using CO Observations, Stellar Photometry, and Gaia DR2 Parallax Measurements
Speagle, Joshua S.; Zucker, Catherine; Finkbeiner, Douglas P. +4 more
We present a new technique to determine distances to major star-forming regions across the Perseus Molecular Cloud, using a combination of stellar photometry, astrometric data, and 12CO spectral-line maps. Incorporating the Gaia DR2 parallax measurements when available, we start by inferring the distance and reddening to stars from thei…
The First Naked-eye Superflare Detected from Proxima Centauri
Loyd, R. O. Parke; Law, Nicholas M.; Youngblood, Allison +11 more
Proxima b is a terrestrial-mass planet in the habitable zone of Proxima Centauri. Proxima Centauri’s high stellar activity, however, casts doubt on the habitability of Proxima b: sufficiently bright and frequent flares and any associated proton events may destroy the planet’s ozone layer, allowing lethal levels of UV flux to reach its surface. In …
The HST Large Programme on ω Centauri. II. Internal Kinematics
Milone, Antonino P.; Anderson, Jay; van der Marel, Roeland P. +7 more
In this second installment of the series, we look at the internal kinematics of the multiple stellar populations of the globular cluster ω Centauri in one of the parallel Hubble Space Telescope (HST) fields, located at about 3.5 half-light radii from the center of the cluster. Thanks to the over 15 yr long baseline and the exquisite astrometric pr…
Clumpy Galaxies in CANDELS. II. Physical Properties of UV-bright Clumps at 0.5 ≤ z < 3
Pérez-González, Pablo G.; Bell, Eric F.; Ferguson, Henry C. +20 more
Studying giant star-forming clumps in distant galaxies is important to understand galaxy formation and evolution. At present, however, observers and theorists have not reached a consensus on whether the observed “clumps” in distant galaxies are the same phenomenon that is seen in simulations. In this paper, as a step to establish a benchmark of di…
A Survey of CH3CN and HC3N in Protoplanetary Disks
Bergner, Jennifer B.; Loomis, Ryan A.; Öberg, Karin I. +2 more
The organic content of protoplanetary disks sets the initial compositions of planets and comets, thereby influencing subsequent chemistry that is possible in nascent planetary systems. We present observations of the complex nitrile-bearing species CH3CN and HC3N toward the disks around the T Tauri stars AS 209, IM Lup, LkCa 1…
The Gould's Belt Distances Survey (GOBELINS). IV. Distance, Depth, and Kinematics of the Taurus Star-forming Region
Kounkel, Marina; Heyer, Mark; Rodríguez, Luis F. +13 more
We present new trigonometric parallaxes and proper motions of young stellar objects in the Taurus molecular cloud complex from observations collected with the Very Long Baseline Array as part of the Gould’s Belt Distances Survey. We detected 26 young stellar objects and derived trigonometric parallaxes for 18 stars with an accuracy of 0.3% to a fe…