Daniela Bettoni et al 2019 ApJL 873 L14

Hubble images revealed an Einstein cross lensing system that consists of an unusual Lyman-break galaxy (LBG) at z = 3.03 lensed by a galaxy at z = 0.556. This is only the second known case of a lensed LBG.

Elen C. A. Golightly et al 2019 ApJ 872 163

Models show that, for a fast-spinning black hole, whether the spin is prograde or retrograde has significant impact on the effectiveness and timing of a tidal disruption event, with prograde spins resulting in faster fallback.

Chan-Kao Chang et al 2019 ApJS 241 6

A Pan-STARRS survey of asteroid rotation periods has discovered 7 new super-fast rotators, asteroids with rotation periods shorter than 2 hours and diameters larger than ~0.3 km.

Brenna Mockler et al 2019 ApJ 872 151

Modeling of 14 tidal disruption events suggest the events have black-hole masses of 10⁶–10⁸ M_⊙ and that the masses predicted are as reliable as those based on bulk galaxy properties.

Avery F. Garon et al 2019 AJ 157 126

Citizen science is used to study the impact of cluster environment on the morphology of a sample of 4,304 extended radio galaxies, for which 87% lie within a projected 15 Mpc of an optically identified cluster.

Hsiang-Chih Hwang et al 2019 ApJ 872 144

Data from 1,222 late-type star-forming galaxies in the SDSS IV MaNGA survey reveals anomalously low-metallicity gas in 10% of the star-forming spaxels and in 25% of the galaxies in the sample.