Journals Digest RSS

Kohei Ichikawa et al 2019 ApJL 883 L13

NuSTAR X-ray observation of the nearby galaxy Arp 187 reveal a luminosity decline of this AGN by more than a factor of 1,000, suggesting this is a “dead” quasar that’s currently quiet but had high past activity.

Javier A. Ahumada et al 2019 ApJ 882 171

Gemini-South observations are used to identify four white dwarves in the centers of faint and extended planetary neubulae — stars that are likely the central ionizing sources of the nebulae.

1 160 161 162 163 164 328