Search Publications
HST/COS Observations of Quasar Outflows in the 500-1050 Å Rest Frame. VI. Wide, Energetic Outflows in SDSS J0755+2306
Xu, Xinfeng; Kriss, Gerard A.; Arav, Nahum +2 more
We present the analysis of two outflows (S1 at -5500 km s-1 and S2 at -9700 km s-1) seen in recent Hubble Space Telescope/Cosmic Origins Spectrograph observations of quasar SDSS J0755+2306 (z = 0.854). The outflows are detected as absorption troughs from both high-ionization species, including N III, O III, and S IV, and very…
Artificial Intelligence-Assisted Inversion (AIAI) of Synthetic Type Ia Supernova Spectra
Wang, Lifan; Hu, Lei; Chen, Xingzhuo
We generate ∼100,000 model spectra of Type 1a supernovae (SNe Ia) to form a spectral library for the purpose of building an artificial intelligence-assisted inversion (AIAI) algorithm for theoretical models. As a first attempt, we restrict our studies to the time around B-band maximum and compute theoretical spectra with a broad spectral wavelengt…
AstroSat UVIT Detections of Chandra X-Ray Sources in M31
Chen, Y.; Leahy, D. A.
An ultraviolet (UV) survey of M31 has been carried out during 2017-19 with the Ultra-Violet Imaging Telescope (UVIT) instrument on board the AstroSat Observatory. Here we match the M31 UVIT source catalog with the Chandra source catalog. We find 67 UVIT/Chandra sources detected in a varying number of UV and X-ray bands. The UV and X-ray photometry…
Identification of Single Spectral Lines through Supervised Machine Learning in a Large HST Survey (WISP): A Pilot Study for Euclid and WFIRST
Rodighiero, G.; Malkan, M.; Henry, A. +13 more
Future surveys focusing on understanding the nature of dark energy (e.g., Euclid and WFIRST) will cover large fractions of the extragalactic sky in near-IR slitless spectroscopy. These surveys will detect a large number of galaxies that will have only one emission line in the covered spectral range. In order to maximize the scientific return of th…
A Systematic Search for the Reddest Far-infrared and Submillimeter Galaxies: Revealing Dust-embedded Starbursts at High Redshifts
Yan, Haojing; Ma, Zhiyuan; Huang, Jia-Sheng +1 more
We present the results of our systematic search for the reddest far-infrared (FIR) and submillimeter (sub-mm) galaxies using the data from the Herschel Multi-tiered Extragalactic Survey (HerMES) and the SCUBA2 Cosmological Legacy Survey (S2CLS). The red FIR galaxies are "500 µm risers," whose spectral energy distributions increase with wavel…
Long-period High-amplitude Red Variables in the KELT Survey
Pepper, Joshua; Stassun, Keivan G.; Siverd, Robert J. +8 more
We present a sample of 4132 Mira-like variables (red variables with long periods and high amplitudes) in the Kilodegree Extremely Little Telescope (KELT) survey. Of these, 376 are new Mira-like detections. We used Two Micron All Sky Survey (2MASS) colors to identify candidate asymptotic giant branch stars. We searched for photometric variability a…
The Extended Gaia-PS1-SDSS (GPS1+) Proper Motion Catalog
Goldman, Bertrand; Tian, Hai-Jun; Rix, Hans-Walter +3 more
The Gaia + PanSTARRS1 (PS1) + Sloan Digital Sky Survey (SDSS) + Two Micron All-Sky Survey (2MASS) (GPS1) catalog was released in 2017. It delivered precise proper motions for around 350 million sources down to a magnitude of $r\sim 20$ mag. In this study, we present GPS1+, the extension GPS1 catalog down to $r\sim 22.5$ mag, based on Gaia data rel…
HST/COS Observations of Quasar Outflows in the 500-1050 ŠRest Frame. VII. Distances and Energetics for 11 Outflows in Five Quasars
Xu, Xinfeng; Kriss, Gerard A.; Arav, Nahum +2 more
From Hubble Space Telescope/Cosmic Origins Spectrograph spectra of five quasars, 16 outflows are detected. For 11 outflows, we are able to constrain their distances to the central source (R) and their energetics. In instances of multiple electron number density determinations (used in the calculation of R) for the same outflow, the values are cons…
Massive Stars in the SDSS-IV/APOGEE2 Survey. III. New OB Stars in the Direction of the Sagittarius Spiral Arm
Minniti, Dante; Roman-Lopes, Alexandre; Tapia, Mauricio +2 more
We have applied the semi-empirical spectral analysis, developed by the Sloan Digital Sky Survey (SDSS)-IV/Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE2) Massive Star Team, to a large sample of new O- and B-type stars identified along the Sagittarius spiral arm, in the direction of the southern star clusters NGC3603 and NGC3576.…
A Catalog of Periodic Variables in Open Clusters M35 and NGC 2158
Bouma, L. G.; Bhatti, W.; Bakos, G. Á. +3 more
We present a catalog of 1143 periodic variables, compiled from our image-subtracted photometric analysis of the K2 Campaign-0 super stamp. This super stamp is centered on the open clusters M35 and NGC 2158. Approximately 46% of our periodic variables were previously unreported. Of the catalog variables, we find that 331 are members of M35 and 56 a…