M. Schramm et al 2019 ApJ 881 145
SDSS J163909+282447.1, a luminous quasar at z = 3.84 with an extremely massive for a supermassive black hole (2.5 × 1010 M⊙), is measured to have a stellar mass that’s a factor of at least ~16 less than expected.
R. A. Street and E. Bachelet 2019 AJ 158 110
Now that its primary mission is concluded, the New Horizons spacecraft’s LORRI imager could be used to observe microlensing events in the galactic bulge, possibly providing constraints on lens properties.
Pawel Pietrukowicz et al 2019 ApJL 881 L41
OGLE-UCXB-01, a 12.8 minute variable object located in the galactic bulge globular cluster Djorg 2, is shown to be a likely ultracompact X-ray binary system exhibiting a fast period decrease as its orbit decays.
Khyati Malhan et al 2019 ApJ 881 106
The GD-1 stellar stream has a secondary diffuse, extended stellar component around it, supporting the idea that its progenitor was originally formed outside of the Milky Way in a now defunct dark satellite galaxy.
S. J. Zheng et al 2019 ApJS 244 1
By combining 5-day observations of the Crab pulsar made with three on-board telescopes, the position and velocity of the Insight-HXMT are pinpointed to within 10 km and 10 m/s, respectively.
Tom A. Nordheim et al 2019 ApJL 881 L29
Particle physics simulations suggest that Europa is partially shielded from galactic cosmic rays by the Jovian magnetosphere, and the radiation dose due to these particles is small at Europa’s surface.