Alexandre Emsenhuber and Erik Asphaug 2019 ApJ 875 95
In similar-sized planetary collisions, a significant part of the impactor often continues downrange. Roughly 50% of these “runners” reimpact their target planets; the others remain in orbit for tens of millions of years.
Dong-Woo Kim et al 2019 ApJS 241 36
In a new project, spatially resolved 2D spectral maps have been created of the hot gas from 70 individual early-type galaxies; they are available for general use at the Chandra Galaxy Atlas (CGA) website.
Stephanie H. Ho et al 2019 ApJ 875 54
Cosmological hydrodynamic simulations suggest that cold gas accretes onto galaxies anisotropically and it can plausibly account for sustaining the star-forming activities of many galaxies.
David V. Martin et al 2019 ApJL 875 L25
Calculations suggest that a Neptune-sized exomoon candidate in the Kepler-1625 system may only transit ~40% of the time, suggesting ~6 non-transits would be required to confidently rule out the moon’s existence.
William Janesh et al 2019 AJ 157 183
Imaging of 23 ultracompact high-velocity clouds has revealed five objects that are likely stellar counterparts, suggesting that five of these clouds are dwarf galaxies in or near the Local Group.
Yan-Rong Li et al 2019 ApJS 241 33
Optical monitoring of Ark 120, a nearby radio-quiet active galactic nucleus, reveals a 20-year periodicity that potentially indicates this galaxy hosts a sub-parsec supermassive black hole binary.