Search Publications
Evolution of C IV Absorbers. II. Where Does C IV Live?
Kacprzak, Glenn G.; Churchill, Christopher W.; Nielsen, Nikole M. +4 more
We use the observed cumulative statistics of C IV absorbers and dark matter halos to infer the distribution of C IV-absorbing gas relative to galaxies at redshifts 0 ≤ z ≤ 5. We compare the cosmic incidence dN/dX of C IV absorber populations and galaxy halos, finding that massive L ≥ L ⋆ halos alone cannot account for all the observed W…
Herschel Optimized Tau and Temperature (HOTT) Maps: Uncertainty Analysis and Robust Parameter Extraction
Singh, Ayushi; Martin, Peter G.
We introduce the HOTT dust optical depth and temperature maps parameterizing thermal dust emission. Such maps have revolutionized studies of the distribution of matter in molecular clouds and processes relevant to star formation, including virial stability. HOTT maps for a suite of fields, including the Herschel Gould Belt Survey, are available on…
The North/South Asymmetry of the Galaxy: Possible Connection to the Vertical Phase-space Snail
Mao, Shude; Liu, Chao; Shen, Juntai +2 more
The galaxy is found to be in disequilibrium based on recent findings of the north/south (N/S) asymmetry and the phase mixing signatures, such as a phase spiral (snail) structure in the vertical phase space (z - V z ). We show that the N/S asymmetry in a tracer population of dwarfs may be quantitatively modeled with a simple phase snail…
Discovery of four super-soft X-ray sources in XMM-Newton observations of the Large Magellanic Cloud
Haberl, F.; Maitra, C.
Context. Super-soft X-ray sources were established as a heterogeneous class of objects from observations of the Large Magellanic Cloud (LMC).
Aims: We have searched for new sources of this class in the X-ray images obtained from the XMM-Newton survey of the LMC and additional archival observations.
Methods: We first selected candidates b…
Evidence of surface heterogeneity on active asteroid (3200) Phaethon
Granvik, Mikael; MacLennan, Eric; Marshall, Sean
Thermal infrared emission and thermophysical modeling techniques are powerful tools in deciphering the surface properties of asteroids. The near-Earth asteroid (3200) Phaethon is an active asteroid with a very small perihelion distance and is likely the source of the Geminid meteor shower. Using a thermophysical model with a non-convex shape of Ph…
Discovery of new TESS pulsating hot subdwarfs
Balona, L. A.; Krzesinski, J.
Aims: This work is dedicated to a search for new pulsating hot subdwarfs in TESS photometric data which could have been missed in previous searches.
Methods: By matching catalogues of hot subdwarfs with TESS targets and using luminosities from Gaìa parallaxes, a list of 1389 candidate hot subdwarfs observed by TESS was created. The perio…
White Dwarf Binaries across the H-R Diagram
Schneider, Donald P.; Majewski, Steven R.; Stassun, Keivan G. +7 more
We created the APOGEE-GALEX-Gaia catalog to study white dwarf (WD) binaries. This database aims to create a minimally biased sample of WD binary systems identified from a combination of GALEX, Gaia, and APOGEE data to increase the number of WD binaries with orbital parameters and chemical compositions. We identify 3414 sources as WD binary candida…
The Solar Cycle Temporal Variation of the Solar Wind Charge Exchange X-Ray Lines
Kaaret, Philip; Bregman, Joel N.; Qu, Zhijie +2 more
Solar wind charge exchange (SWCX) is the primary contamination of soft X-ray emission lines from the Milky Way (MW) hot gas. We report a solar cycle (≈10 yr) temporal variation of observed O VII and O VIII emission line measurements in the XMM-Newton archive, which is tightly correlated with the solar cycle traced by the sunspot number (SSN). This…
Stumbling over Planetary Building Blocks: AU Microscopii as an Example of the Challenge of Retrieving Debris-disk Dust Properties
Weinberger, Alycia J.; Arnold, Jessica A.; Videen, Gorden +1 more
We explore whether assumptions about dust grain shape affect the resulting estimates of the composition and grain size distribution of the AU Microscopii (AU Mic) debris disk from scattered-light data collected by Lomax et al. The near edge-on orientation of the AU Mic debris disk makes it ideal for studying the effect of the scattering phase func…
A triple star origin for T Pyx and other short-period recurrent novae
Knigge, C.; Toonen, S.; Boekholt, T. C. N.
Recurrent novae are star systems in which a massive white dwarf accretes material at such a high rate that it undergoes thermonuclear runaways every 1-100 yr. They are the only class of novae in which the white dwarf can grow in mass, making some of these systems strong Type Ia supernova progenitor candidates. Almost all known recurrent novae are …