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Chandra Acis Survey of X-Ray Point Sources in 383 Nearby Galaxies I. the Source Catalog
Jifeng Liu
The Chandra data archive after eight years' accumulation is a treasure for various studies, and in this paper we exploit this valuable resource to study the X-ray point source popu…
Precise Measurement of the Spin Parameter of the Stellar-Mass Black Hole M33 X-7
Jifeng Liu, Jeffery E. McClintock, Ramesh Narayan +2
In prior work, {\it Chandra} and Gemini-North observations of the eclipsing X-ray binary M33 X-7 have yielded measurements of the mass of its black hole primary and the system's or…
No periodicity revealed for an "eclipsing" ultraluminous supersoft X-ray source in M81
Jifeng Liu
Luminous supersoft X-ray sources found in the Milky Way and Magellanic Clouds are likely white dwarfs that steadily or cyclically burn accreted matter on their surface, which are p…
An Ultraluminous Supersoft X-ray Source in M81: An Intermediate-Mass Black Hole?
Jifeng Liu, Rosanne Di Stefano
Ultraluminous supersoft X-ray sources (ULSSS) exhibit supersoft spectra with blackbody temperatures of 50-100 eV and bolometric luminosities above erg s, and are p…
Optical studies of the ultraluminous X-ray source NGC1313 X-2
Jifeng Liu, Joel Bregman, Jon Miller +1
NGC1313 X-2 was among the first ultraluminous X-ray sources discovered, and has been a frequent target of X-ray and optical observations. Using the HST/ACS multi-band observations,…
Discovery of an eclipsing X-ray binary with a 32.69 hour period in M101: an analog of Her X-1 or LMC X-4?
Jifeng Liu, Rosanne di Stefano, Jeffrey McClintock +3
We report the discovery of an eclipsing X-ray binary in M101, the first such system to be discovered outside the Local Group. Based on a sequence of 25 Chandra observations that sa…