Ryunosuke Maeda et al 2021 ApJ 908 2
New simulations demonstrate that the precursors of young massive clusters are formed by the global gravitational collapse of molecular clouds, and young massive clusters can be formed even in low-metallicity environments.
Michael J. Koss et al 2021 ApJS 252 29
A new study of host-galaxy molecular gas properties suggests that active galactic nuclei in massive galaxies tend to have more molecular gas and higher gas fractions than inactive galaxies matched in stellar mass.
A. Albert et al 2021 ApJL 907 L30
The HAWC observatory has discovered the γ-ray source HAWC J1825-134, whose energy spectrum extends well beyond 200 TeV; the source of the radiation is likely PeV cosmic rays colliding with ambient gas.
A. N. Heinze et al 2021 Planet. Sci. J. 2 12
New estimates of the the total population of near-Earth objects in the solar system are ~372,000 objects of ~34-m diameter and ~15,900,000 objects of ~10-m diameter.
Yao-Yuan Mao et al 2021 ApJ 907 85
Stage II of the SAGA survey has expanded the catalog of satellites of Milky Way analog galaxies to 127 satellites around 36 analogs. The number and luminosities of Milky-Way satellites are consistent with SAGA systems.
Elisabeth R. Newton et al 2021 AJ 161 65
The newly discovered young planetary system TOI 451 includes three validated planets at periods of 1.9, 9.2, and 16 days, providing the opportunity to study planetary atmospheres that may still be in the process of evolving.