Search Publications
Investigating the Structure of Vela X
Chevalier, R. A.; Miceli, M.; Bocchino, F. +9 more
Vela X is a prototypical example of a pulsar wind nebula whose morphology and detailed structure have been affected by interaction with the reverse shock of its host supernova remnant. The resulting complex of filamentary structure and mixed-in ejecta embedded in a nebula that is offset from the pulsar provides the best example we have of this mid…
Eclipsing Binaries in the Open Cluster Ruprecht 147. I. EPIC 219394517
Torres, Guillermo; Vanderburg, Andrew; Kraus, Adam L. +2 more
Eclipsing binaries in star clusters offer more stringent tests of stellar evolution theory than field binaries because models must not only match the binary properties, but also the radiative properties of all other cluster members at a single chemical composition and a single age. Here we report new spectroscopic observations of the G-type, detac…
On the Kinematic Signature of the Galactic Warp As Revealed By the LAMOST-TGAS Data
Huang, Y.; Chen, B. -Q.; Wang, C. +6 more
Using a sample of about 123,000 stars with accurate 3D velocity measurements from the LAMOST-TGAS data, we confirm the kinematic signature of the Galactic warp recently found by Schönrich & Dehnen. The data reveal a clear trend of increasing mean vertical velocity \overline{{V}z} as a function of absolute vertical angular momentum L…
Two-sided-loop Jets Associated with Magnetic Reconnection between Emerging Loops and Twisted Filament Threads
Chen, Yao; Huang, Zhenghua; Zheng, Ruisheng +3 more
Coronal jets are always produced by magnetic reconnection between emerging flux and pre-existing overlying magnetic fields. When the overlying field is vertical/oblique or horizontal, the coronal jet will appear as anemone type or two-sided-loop type. Most observational jets are of the anemone type, and only a few two-sided-loop jets have been rep…
The Minimum Mass of Rotating Main-sequence Stars and its Impact on the Nature of Extended Main-sequence Turnoffs in Intermediate-age Star Clusters in the Magellanic Clouds
Girardi, Léo; Bellini, Andrea; Goudfrooij, Paul +3 more
Extended main-sequence turnoffs (eMSTOs) are a common feature in color-magnitude diagrams (CMDs) of young and intermediate-age star clusters in the Magellanic Clouds. The nature of eMSTOs is still debated. The most popular scenarios are extended star formation and ranges of stellar rotation rates. Here, we study implications of a kink feature in t…
The Megaparsec-scale Gas-sloshing Spiral in the Remnant Cool Core Cluster Abell 1763
Clarke, T. E.; Randall, S. W.; Blanton, E. L. +4 more
We present a multiwavelength study of the massive galaxy cluster Abell 1763 at redshift z = 0.231. Image analysis of a 19.6 ks Chandra archival observation reveals a cluster-wide spiral of enhanced surface brightness in the intracluster medium (ICM). While such spirals are understood to form in clusters with sloshing strong cool cores (SCCs), the …
A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data
Bleem, L. E.; Stark, A. A.; George, E. M. +43 more
We study the consistency of 150 GHz data from the South Pole Telescope (SPT) and 143 GHz data from the Planck satellite over the patch of sky covered by the SPT-SZ survey. We first visually compare the maps and find that the residuals appear consistent with noise after accounting for differences in angular resolution and filtering. We then calcula…
Follow-up Imaging of Disk Candidates from the Disk Detective Citizen Science Project: New Discoveries and False Positives in WISE Circumstellar Disk Surveys
Baranec, Christoph; Riddle, Reed; Debes, John H. +17 more
The Disk Detective citizen science project aims to find new stars with excess 22 µm emission from circumstellar dust in the AllWISE data release from the Wide-field Infrared Survey Explorer. We evaluated 261 Disk Detective objects of interest with imaging with the Robo-AO adaptive optics instrument on the 1.5 m telescope at Palomar Observato…
Characterization of Stellar and Substellar Members in the Coma Berenices Star Cluster
Herczeg, Gregory J.; Jose, Jessy; Tang, Shih-Yun +3 more
We have identified stellar and substellar members in the nearby star cluster Coma Berenices, using photometry, proper motions, and distances of a combination of 2MASS, UKIDSS, URAT1, and Gaia/DR2 data. Those with Gaia/DR2 parallax measurements provide the most reliable sample to constrain the distance, averaging 86.7 pc with a dispersion of 7.1 pc…
Discovery of an Extremely Luminous Dust-obscured Galaxy Observed with SDSS, WISE, JCMT, and SMA
Ueda, Junko; Kawabe, Ryohei; Saito, Toshiki +5 more
We present the discovery of an extremely luminous dust-obscured galaxy (DOG) at z spec = 3.703, WISE J101326.25+611220.1. This DOG is selected as a candidate of extremely luminous infrared (IR) galaxies based on the photometry from the Sloan Digital Sky Survey and Wide-field Infrared Survey Explorer. In order to derive its accurate IR l…