Lin Yan et al 2019 ApJ 874 44
A detailed study of a transient in the center of SDSS1115+0544 suggests this event is a “turn-on” AGN, transitioning from a quiescent state to a type-1 AGN on a very short timescale of ~120–200 days.
Tadafumi Matsuno et al 2019 ApJL 874 L35
Measured abundances of a group of metal-poor stars in the Milky Way halo provide a new support for the idea that the halo’s retrograde component is dominated by an accreted dwarf galaxy.
Man-To Hui et al 2019 AJ 157 162
A study of comet C/2010 U3 (Boattini) indicates that it is almost certainly a dynamically old comet from the Oort cloud, and its observed activity cannot be caused by retained heat from its previous apparition.
Edward W. Schwieterman et al 2019 ApJ 874 9
New results from ecosphere–atmosphere models suggest that the spectroscopic detection of carbon monoxide in a planet’s atmosphere is not necessarily a counter indicator to the presence of life.
Gautham Narayan et al 2019 ApJS 241 20
A network of 19 faint northern and equatorial white dwarfs are presented as spectrophotometric standards for present and future ground- and space-based, wide-field, ultraviolet to near-infrared observatories.
C. L. Carilli et al 2019 ApJL 874 L32
The first direct imaging of what may be the thick torus in the active galactic nucleus of the powerful radio galaxy Cygnus A was conducted using the Jansky VLA at 18–48 GHz, with a resolution down to 45 mas.