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Supersonic Expansion of the Bipolar H II Region Sh2-106: A 3500 Year Old Explosion?
Ginsburg, Adam; Bally, John; Chia, Zen +4 more
Multi-epoch narrowband Hubble Space Telescope images of the bipolar H II region Sh2-106 reveal highly supersonic nebular proper motions that increase with projected distance from the massive young stellar object S106 IR, reaching over ~30 mas yr-1 (~150 km s-1 at D = 1.09 kpc) at a projected separation of ~1.'4 (0.44 pc) from…
Unveiling the disc structure in ultraluminous X-ray source NGC 55 ULX-1
Fabian, A. C.; Pinto, C.; Di Salvo, T. +11 more
Ultraluminous X-ray sources (ULXs) are the most extreme among X-ray binaries in which the compact object, a neutron star or a black hole, accretes matter from the companion star, and exceeds a luminosity of $10^{39} \ \rm erg \, s^{-1}$ in the X-ray energy band alone. Despite two decades of studies, it is still not clear whether ULX spectral trans…
Dielectric Constant Estimation of Lunar Surface Using Mini-RF and Chandrayaan-2 SAR Data
Kumar, Raj; Das, Anup; Putrevu, Deepak +4 more
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…