Search Publications
Giant Radio Quasars: Sample and Basic Properties
Jamrozy, Marek; Kuźmicz, Agnieszka
We present the largest sample of giant radio quasars (GRQs), which are defined as having a projected linear size greater than 0.7 Mpc. The sample consists of 272 GRQs, of which 174 are new objects discovered through cross-matching the NRAO Very Large Array Sky Survey and the Sloan Digital Sky Survey 14th Data Release Quasar Catalog (DR14Q) and con…
A Hubble Space Telescope Imaging Survey of Low-redshift Swift-BAT Active Galaxies
Ho, Luis C.; Barth, Aaron J.; Kim, Minjin +1 more
We present initial results from a Hubble Space Telescope snapshot imaging survey of the host galaxies of Swift-BAT active galactic nuclei (AGN) at z < 0.1. The hard X-ray selection makes this sample relatively unbiased in terms of obscuration, compared to optical AGN selection methods. The high-resolution images of 154 target AGN enable us to i…
Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data
Troja, E.; Caraveo, P. A.; Mirabal, N. +114 more
We present the first Fermi Large Area Telescope (LAT) catalog of long-term γ-ray transient sources (1FLT). This comprises sources that were detected on monthly time intervals during the first decade of Fermi-LAT operations. The monthly timescale allows us to identify transient and variable sources that were not yet reported in other Fermi-LAT cata…
Multiwavelength Properties of Miras
Udalski, Andrzej; Szymański, Michał K.; Skowron, Jan +12 more
We comprehensively study the variability of Miras in the Large Magellanic Cloud by simultaneously analyzing light curves in 14 bands in the range of 0.5-24 µm. We model over 20 yr long, high-cadence I-band light curves collected by the Optical Gravitational Lensing Experiment (OGLE) and fit them to light curves collected in the remaining opt…
Astro-COLIBRI-The COincidence LIBrary for Real-time Inquiry for Multimessenger Astrophysics
Becker Tjus, J.; Lefranc, V.; Schüssler, F. +4 more
Astro-COLIBRI is a novel tool that evaluates alerts of transient observations in real time, filters them by user-specified criteria, and puts them into their multiwavelength and multimessenger context. Through fast generation of an overview of persistent sources as well as transient events in the relevant phase space, Astro-COLIBRI contributes to …
Atomic Transition Probabilities of Neutral Calcium
Sneden, C.; Sobeck, J.; Roederer, I. U. +3 more
The goals of this study are (1) to test the best theoretical transition probabilities for Ca I (a relatively light alkaline earth spectrum) from a modern ab initio calculation using configuration interaction plus many-body perturbation theory against the best modern experimental transition probabilities and (2) to produce as accurate and comprehen…
Precise Ages of Field Stars from White Dwarf Companions in Gaia DR2
Qiu, Dan; Tian, Hai-Jun; Liu, Gao-Chao +5 more
We analyze 4050 wide binary star systems involving a white dwarf (WD) and usually a main-sequence (MS) star, drawn from the large sample assembled by Tian et al. Using the modeling code BASE-9, we determine the system's ages, the WD progenitors' zero-age MS masses, the extinction values (AV), and the distance moduli. Discarding the case…
Exploring the Stellar Rotation of Early-type Stars in the LAMOST Medium-resolution Survey. I. Catalog
Deng, Licai; de Grijs, Richard; Liu, Chao +3 more
We derive stellar parameters and abundances ("stellar labels") of 40,034 late-B and A-type main-sequence stars extracted from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope Medium Resolution Survey (LAMOST-MRS). The primary selection of our early-type sample was obtained from LAMOST Data Release 7 based on spectral-line indices. We …
Surveying the Bright Stars by Optical Interferometry. III. A Magnitude-limited Multiplicity Survey of Classical Be Stars
Hutter, D. J.; Tycner, C.; Zavala, R. T. +3 more
We present the results of a multiplicity survey for a magnitude-limited sample of 31 classical Be stars conducted with the Navy Precision Optical Interferometer and the Mark III Stellar Interferometer. The interferometric observations were used to detect companions in 10 previously known binary systems. For two of these sources (66 Oph and β Cep) …
An ACA Survey of [C I] 3P1-3P0, CO J = 4 - 3, and Dust Continuum in Nearby U/LIRGs
Ho, Luis C.; Bolatto, Alberto D.; Tadaki, Ken-ichi +11 more
We present the results of surveying [C I] 3P1-3P0, 12CO J = 4 - 3, and 630 µm dust continuum emission for 36 nearby ultra/luminous infrared galaxies (U/LIRGs) using the Band 8 receiver mounted on the Atacama Compact Array of the Atacama Large Millimeter/submillimeter Array. We describe t…