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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…
Characterization and photometric performance of the Hyper Suprime-Cam Software Pipeline
Leauthaud, Alexie; Mandelbaum, Rachel; Bosch, James +9 more
The Subaru Strategic Program (SSP) is an ambitious multi-band survey using the Hyper Suprime-Cam (HSC) on the Subaru telescope. The Wide layer of the SSP is both wide and deep, reaching a detection limit of i ∼ 26.0 mag. At these depths, it is challenging to achieve accurate, unbiased, and consistent photometry across all five bands. The HSC data …
Clouds and Hazes of Venus
Titov, Dmitrij V.; Ignatiev, Nikolay I.; Wilson, Colin F. +2 more
More than three decades have passed since the publication of the last review of the Venus clouds and hazes. The paper published in 1983 in the Venus book summarized the discoveries and findings of the US Pioneer Venus and a series of Soviet Venera spacecraft (Esposito et al. in Venus, p. 484, 1983). Due to the emphasis on in-situ investigations fr…
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…
A Galaxy-scale Fountain of Cold Molecular Gas Pumped by a Black Hole
Simionescu, A.; Fabian, A. C.; Gaspari, M. +36 more
We present Atacama Large Millimeter/submillimeter Array and Multi-Unit Spectroscopic Explorer observations of the brightest cluster galaxy in Abell 2597, a nearby (z = 0.0821) cool core cluster of galaxies. The data map the kinematics of a three billion solar mass filamentary nebula that spans the innermost 30 kpc of the galaxy’s core. Its warm io…
Radial distribution of stellar motions in Gaia DR2
Cropper, Mark; Grand, Robert J. J.; Seabroke, George +4 more
By taking advantage of the superb measurements of position and velocity for an unprecedented large number of stars provided in Gaia DR2, we have generated the first maps of the rotation velocity, Vrot, and vertical velocity, Vz, distributions as a function of the Galactocentric radius, Rgal, across a radial range o…
Wide-field Infrared Survey Explorer (WISE) Catalog of Periodic Variable Stars
Yang, Ming; Wang, Shu; Deng, Licai +2 more
We have compiled the first all-sky mid-infrared variable-star catalog based on Wide-field Infrared Survey Explorer five-year survey data. Requiring more than 100 detections for a given object, 50,282 carefully and robustly selected periodic variables are discovered, of which 34,769 (69%) are new. Most are located in the Galactic plane and near the…
STREAMFINDER - I. A new algorithm for detecting stellar streams
Malhan, Khyati; Ibata, Rodrigo A.
We have designed a powerful new algorithm to detect stellar streams in an automated and systematic way. The algorithm, which we call the STREAMFINDER, is well suited for finding dynamically cold and thin stream structures that may lie along any simple or complex orbits in Galactic stellar surveys containing any combination of positional and kinema…