200 citations · 3.6k across the 236 of their papers we have counts for
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astro-ph2002★ 92 cited
The optical counterpart of a Ultraluminous X-Ray Object in M81
Ji-Feng Liu, Joel N. Bregman, Patrick Seitzer
Ultraluminous X-Ray Objects are off-nucleus point sources with - erg/s and are among the most poorly understood X-ray sources. To help understand their nature…
astro-ph2002★ 38 cited
An Ultra-luminous X-Ray Object with a 2 hour period in M51
Ji-Feng Liu, Joel N. Bregman, Jimmy Irwin +1
Ultra-luminous X-Ray Objects are off-nucleus point sources with - erg/s but the nature of such systems are largely unidentified. Here we report a 2.1 hour per…
astro-ph2002★ 34 cited
A Scattered Light Echo around SN 1993J in M81
Ji-Feng Liu, Joel N. Bregman, Patrick Seitzer
A light echo around SN 1993J was observed 8.2 years after explosion by a HST WFPC2 observation, adding to the small family of supernovae with light echoes. The light echo was forme…