Xin Liu et al 2019 ApJ 887 90
SDSS J0849+1114 is the first known triple Type 2 Seyfert nucleus, representing three active black holes currently at kiloparsec-scale separations — though they may evolve into a bound triple system within 2 Gyr.
C. A. Grady et al 2020 ApJL 889 L21
Hubble imaging of the debris disk of M dwarf AU Mic tracks outward motion of features in the southeast arm, indicating that the debris disk is losing mass at ~10% of the stellar wind mass loss rate.
Lei Liu and Xiaoying Pang 2019 ApJS 245 32
A new star-cluster hunting pipeline is used to identify 2,443 star cluster candidates among disk stars in the second Gaia data release, including 76 that were previously unidentified.
Evan N. Kirby et al 2020 AJ 159 46
New observations of M31 dwarf spheroidal satellites confirm that M31 satellites obey the same relation between stellar mass and stellar metallicity as do Milky Way satellites and other dwarf galaxies in the Local Group.
Minghao Guo et al 2020 ApJ 888 65
N-body simulations of the evolution of galaxies with single and double bars show that destruction of the short inner bar contributes significantly to the growth of the galaxy’s central stellar bulge.
Sandeep K. Rout et al 2020 ApJL 888 L30
Spectral analysis of the galactic black hole binary MAXI J1659−152 indicates the spin of the black hole has to be negative — marking the first clear detection of negative spin in a galactic black hole binary.