Search Publications
The 3CR Chandra Snapshot Survey: Extragalactic Radio Sources with Redshifts between 1 and 1.5
Forman, W. R.; Wilkes, B. J.; Liuzzo, E. +11 more
The aim of this paper is to present an analysis of newly acquired X-ray observations of 16 extragalactic radio sources listed in the Third Cambridge Revised (3CR) catalog and not previously observed by Chandra. Observations were performed during Chandra Cycle 17, extending X-ray coverage for the 3CR extragalactic catalog up to z = 1.5. Among the 1…
Shocked Interstellar Clouds and Dust Grain Destruction in the LMC Supernova Remnant N132D
Ruiter, Ashley J.; Dopita, Michael A.; Sutherland, Ralph S. +3 more
From integral field data we extract the optical spectra of 20 shocked clouds in the supernova remnant N132D in the Large Magellanic Cloud (LMC). Using self-consistent shock modeling, we derive the shock velocity, pre-shock cloud density, and shock ram pressure in these clouds. We show that the [Fe X] and [Fe XIV] emission arises in faster, partial…
Distant White Dwarfs in the US Naval Observatory Flagstaff Station Parallax Sample
Bergeron, P.; Xu, Siyi; Dufour, P. +18 more
This paper presents new trigonometric parallaxes and proper motions for 214 stars. The measurements were made at the US Naval Observatory Flagstaff Station between 1989 and 2017, and the average uncertainty in the parallax values is 0.6 mas. We find good agreement with Gaia Data Release 2 measurements for the stars in common, although there may be…
The Orbital Architecture and Debris Disks of the HR 8799 Planetary System
Goździewski, Krzysztof; Migaszewski, Cezary
The HR 8799 planetary system with four ≃10 m Jup planets in wide orbits up to ≃70 au and orbital periods up to 500 yr has been detected with direct imaging. Its intriguing orbital architecture is not yet fully resolved due to time-limited astrometry covering only ≃20 yr. Earlier, we constructed a heuristic model of the system based on r…
The Second Data Release of the Beijing-Arizona Sky Survey
Myers, Adam D.; Fan, Xiaohui; Jiang, Linhua +29 more
This paper describes the second data release (DR2) of the Beijing-Arizona Sky Survey (BASS). BASS is an imaging survey covering a 5400 deg2 footprint in the g and r bands using the 2.3 m Bok telescope. DR2 includes the observations through 2017 July obtained by BASS and by the Mayall z-band Legacy Survey (MzLS), which used the 4 m Mayal…
A TESS Dress Rehearsal: Planetary Candidates and Variables from K2 Campaign 17
Bieryla, Allyson; Latham, David W.; Quinn, Samuel N. +40 more
We produce light curves for all ∼34,000 targets observed with K2 in Campaign 17 (C17), identifying 34 planet candidates, 184 eclipsing binaries, and 222 other periodic variables. The forward-facing direction of the C17 field means follow-up can begin immediately now that the campaign has concluded and interesting targets have been identified. The …
Spitzer Observations of the North Ecliptic Pole
Im, M.; Lee, H. M.; Clements, D. L. +19 more
We present a photometric catalog for Spitzer Space Telescope warm mission observations of the North Ecliptic Pole (NEP; centered at R.A. = 18h00m00s, decl. = 66d33m38.ˢ552). The observations are conducted with IRAC in the 3.6 and 4.5 µm bands over an area of 7.04 deg2, reachin…
Abundances and Depletions of Neutron-capture Elements in the Interstellar Medium
Lambert, D. L.; Federman, S. R.; Ritchey, A. M.
We present an extensive analysis of the gas-phase abundances and depletion behaviors of neutron-capture elements in the interstellar medium (ISM). Column densities (or upper limits to the column densities) of Ga II, Ge II, As II, Kr I, Cd II, Sn II, and Pb II are determined for a sample of 69 sight lines with high- and/or medium-resolution archiva…
The UV Emission of Stars in the LAMOST Survey. I. Catalogs
Zhang, Yong; Bai, Yu; Wang, Song +11 more
We present the ultraviolet magnitudes for over three million stars in the LAMOST survey, in which 2,202,116 stars are detected by GALEX. For 889,235 undetected stars, we develop a method to estimate their upper limit magnitudes. The distribution of (FUV - NUV) shows that the color declines with increasing effective temperature for stars hotter tha…
Comparing Chandra and Hubble in the Northern Disk of M31
Williams, Benjamin F.; Eracleous, Michael; Sasaki, Manami +9 more
The X-ray source populations within galaxies are typically difficult to identify and classify with X-ray data alone. We are able to break through this barrier by combining deep new Chandra ACIS-I observations with extensive Hubble Space Telescope (HST) imaging from the Panchromatic Hubble Andromeda Treasury of the M31 disk. We detect 373 X-ray sou…