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The Extremely Luminous Quasar Survey in the Pan-STARRS 1 Footprint (PS-ELQS)
Hall, Patrick B.; Fan, Xiaohui; Huang, Yun-Hsin +7 more
We present the results of the Extremely Luminous Quasar Survey in the 3π survey of the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS; PS1). This effort applies the successful quasar selection strategy of the Extremely Luminous Survey in the Sloan Digital Sky Survey footprint (∼12,000 deg2) to a much larger area (∼21,4…
Discovery of a nitrogen-enhanced mildly metal-poor binary system: Possible evidence for pollution from an extinct AGB star
Beers, Timothy C.; Placco, Vinicius M.; Robin, Annie C. +12 more
We report the serendipitous discovery of a nitrogen-rich, mildly metal-poor ([Fe/H] = -1.08) giant star in a single-lined spectroscopic binary system found in the SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) survey, Data Release 14 (DR14). Previous work has assumed that two percent of halo giants with unusual elemental…
Signatures of an eruptive phase before the explosion of the peculiar core-collapse SN 2013gc
Reichart, D. E.; Smartt, S. J.; Olivares E., F. +12 more
We present photometric and spectroscopic analysis of the peculiar core-collapse supernova (SN) 2013gc, spanning 7 yr of observations. The light curve shows an early maximum followed by a fast decline and a phase of almost constant luminosity. At +200 d from maximum, a brightening of 1 mag is observed in all bands, followed by a steep linear lumino…
Spectral and spatial analysis of the dark matter subhalo candidates among Fermi Large Area Telescope unidentified sources
Ciucă, Ioana; Kawata, Daisuke; Domínguez, Alberto +5 more
Fermi-LAT unidentified sources (unIDs) have proven to be compelling targets for performing indirect dark matter (DM) searches. In a previous work, we found that among the 1235 unIDs in Fermi-LAT's catalogs (3FGL, 2FHL and 3FHL) only 44 of those are DM subhalos candidates. We now implement a spectral analysis to test whether these remaining sources…
New near-infrared JHKs light-curve templates for RR Lyrae variables
Minniti, D.; Walker, A. R.; Mateo, M. +35 more
We provide homogeneous optical (UBVRI) and near-infrared (NIR, JHK) time series photometry for 254 cluster (ω Cen, M 4) and field RR Lyrae (RRL) variables. We ended up with more than 551 000 measurements, of which only 9% are literature data. For 94 fundamental (RRab) and 51 first overtones (RRc) we provide a complete optical/NIR characterization …
A Near-coplanar Stellar Flyby of the Planet Host Star HD 106906
Kalas, Paul; De Rosa, Robert J.
We present an investigation into the kinematics of HD 106906 using the newly released Gaia DR2 catalog to search for close encounters with other members of the Scorpius-Centaurus (Sco-Cen) association. HD 106906 is an eccentric spectroscopic binary that hosts both a large asymmetric debris disk extending out to at least 500 au and a directly image…
ALMA Observations of Atomic Carbon [C I] ( 3 P 1 → 3 P 0 ) and Low-J CO Lines in the Starburst Galaxy NGC 1808
Seta, Masumichi; Salak, Dragan; Nakai, Naomasa +1 more
We present [C I] ≤ft({}3{{P}}1\to {}3{{P}}0\right), 12CO, 13CO, and C18O (J=2\to 1) observations of the central region (radius 1 kpc) of the starburst galaxy NGC 1808 at 30-50 pc resolution conducted with the Atacama Large Millimeter/submillimeter Array. Radiative transfe…
SCUBA-2 observations of candidate starbursting protoclusters selected by Planck and Herschel-SPIRE
Andreani, P.; Valtchanov, I.; Clements, D. L. +21 more
We present SCUBA-2 850 µm observations of 13 candidate starbursting protoclusters selected using Planck and Herschel data. The cumulative number counts of the 850 µm sources in 9 of 13 of these candidate protoclusters show significant overdensities compared to the field, with the probability <10-2 assuming the sources are…
The Precious Set of Radio-optical Reference Frame Objects in the Light of Gaia DR2 Data
Schmitt, Henrique R.; Makarov, Valeri V.; Berghea, Ciprian T. +2 more
We investigate a sample of 3413 International Celestial Reference Frame (ICRF3) extragalactic radio-loud sources with accurate positions determined by very long baseline interferometry in the S/X band, mostly active galactic nuclei and quasars, which are cross-matched with optical sources in the second Gaia data release (Gaia DR2). The main goal o…
Alfvén Wave Propagation in the Io Plasma Torus
Bagenal, F.; Bonfond, B.; Hinton, P. C.
Io, the most volcanically active body in the solar system, fuels a plasma torus around Jupiter with dissociation products of SO2 at a rate of 1,000 kg/s. We use a combination of in situ Voyager 1 data and Cassini Ultraviolet Imaging Spectrograph observations to constrain a diffusive equilibrium model of the Io plasma torus. The interact…