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Star Formation in a Strongly Magnetized Cloud
Caselli, Paola; Arce, Héctor G.; Tan, Jonathan C. +6 more
We study star formation in the Center Ridge 1 (CR1) clump in the Vela C giant molecular cloud, selected as a high column density region that shows the lowest level of dust continuum polarization-angle dispersion, likely indicating that the magnetic field is relatively strong. We observe the source with the Atacama Large Millimeter/submillimeter Ar…
A search for runaway stars in 12 Galactic supernova remnants
Mugrauer, Markus; Lux, Oliver; Bischoff, Richard +1 more
Runaway stars can result from core collapse supernovae in multiple stellar systems. If the supernova disrupts the system, the companion is ejected with its former orbital velocity. A clear identification of a runaway star can yield the time and place of the explosion, as well as orbital parameters of the pre supernova binary system. Previous searc…
Probing the Disk-Corona Systems and Broad-line Regions of Changing-look Quasars with X-Ray and Optical Observations
Green, Paul J.; Anderson, Scott F.; Eracleous, Michael +8 more
"Changing-look" quasars are a new class of highly variable active galactic nuclei that have changed their spectral type over surprisingly short timescales of just a few years. The origin of this phenomenon is debated, but is likely to reflect some change in the accretion flow. To investigate the disk-corona systems in these objects, we measure opt…
The Star Formation History of a Post-starburst Galaxy Determined from Its Cluster Population
Chandar, Rupali; French, K. Decker; Mok, Angus +2 more
The recent star formation histories (SFHs) of post-starburst galaxies have been determined almost exclusively from detailed modeling of their composite starlight. This has provided important but limited information on the number, strength, and duration of bursts of star formation. In this work, we present a direct and independent measure of the re…
The Role of Terahertz and Far-IR Spectroscopy in Understanding the Formation and Evolution of Interstellar Prebiotic Molecules
Mifsud, Duncan V.; Hailey, Perry A.; Traspas Muiña, Alejandra +3 more
Stellar systems are often formed through the collapse of dense molecular clouds which, in turn, return copious amounts of atomic and molecular material to the interstellar medium. An in-depth understanding of chemical evolution during this cyclic interaction between the stars and the interstellar medium is at the heart of astrochemistry. Systemati…
The Rise and Fall of the Eclipsing Binary HS Hydrae
Davenport, James. R. A.; Windemuth, Diana; Warmbein, Karen +3 more
HS Hydrae is a short period eclipsing binary (Porb = 1.57 day) that belongs to a rare group of systems observed to have rapidly changing inclinations. This evolution is due to a third star on an intermediate orbit, and results in significant differences in eclipse depths and timings year to year. Zasche & Paschke revealed that HS Hy…
Local Analogs to High-redshift Galaxies. I. Characterization of Dust Emission and Star Formation History
Wiklind, Tommy; Eufrasio, Rafael T.; Motiño Flores, Skarleth M.
Star-forming dwarf galaxies have properties similar to those expected in high-redshift galaxies. Hence, these local galaxies may provide insights into the evolution of the first galaxies and the physical processes at work. We present a sample of 11 potential local analogs to high-z (LAHz) galaxies. The sample consists of blue compact dwarf galaxie…
Multiwavelength Quasi-periodic Pulsations in a Stellar Superflare
Nakariakov, Valery M.; Kolotkov, Dmitrii Y.; Holt, Robin +1 more
We present the first multiwavelength simultaneous detection of quasi-periodic pulsations (QPPs) in a superflare (more than a thousand times stronger than known solar flares) on a cool star, in soft X-rays (SXRs, with XMM-Newton) and white light (WL, with Kepler). It allowed for the first ever analysis of oscillatory processes in a stellar flare si…
Global Venus Solar Wind Coupling and Oxygen Ion Escape
Fedorov, A.; Barabash, S.; Futaana, Y. +5 more
The present day Venusian atmosphere is dry, yet, in its earlier history a significant amount of water evidently existed. One important water loss process comes from the energy and momentum transfer from the solar wind to the atmospheric particles. Here, we used measurements from the Ion Mass Analyzer onboard Venus Express to derive a relation betw…
Landforms indicative of regional warm based glaciation, Phlegra Montes, Mars
Butcher, Frances E. G.; Gallagher, Colman; Balme, Matt +2 more
Viscous flow features (VFF) occur in the mid-latitudes of Mars and have characteristics consistent with being glaciers. Climate models suggest that martian glaciers are cold-based systems in which meltwater has never been widely produced. VFF are common in Phlegra Montes, a mountain range in the mid-latitudes of the northern hemisphere of Mars. Ho…