Zhihong He et al 2023 ApJS 264 8

Using machine learning, a research team discovered thousands of new star clusters in the Milky Way’s disk, boosting the number of star clusters cataloged from Gaia spacecraft data to nearly 6,000.

Julian H. Krolik and Itai Linial 2022 ApJ 941 24

Simulations suggest that semi-periodic X-ray flares could be due to main-sequence stars on eccentric orbits around black holes; the star loses mass to the black hole, and the resulting flare causes further mass loss.

Valentina Missaglia et al 2023 ApJS 264 6

Despite having the tell-tale signs of a galaxy cluster, like X-ray-emitting gas, 3C 297 appears to contain just a single galaxy, which might mean that the galaxies of an ancient cluster merged long ago.

Benson T. Guest et al 2022 AJ 164 231

X-ray observations of an extragalactic supernova remnant show that the remnant is expanding at a blistering 6,120 kilometers per second, which suggests that the surrounding interstellar medium is low density.

Cecilia Garraffo et al 2022 ApJL 941 L8

Using a newly available map of Proxima Centauri’s surface magnetic field, researchers recalculate the space weather conditions at the location of the habitable-zone planet Proxima Centauri b.

L. A. C. van Son et al 2022 ApJ 940 184

The apparent neutron star–black hole mass gap seen in gravitational wave observations can be explained by selection effects resulting from the properties of the stable mass transfer formation channel.