SIMBAD references

2001A&A...380..251G - Astronomy and Astrophysics, volume 380, 251-257 (2001/12-2)

ROSAT/Chandra observations of a bright transient in M 81.

GHOSH K.K., SWARTZ D.A., TENNANT A.F. and WU K.

Abstract (from CDS):

We present a 10-year X-ray light curve and the spectra of a peculiar X-ray transient in the spiral galaxy M 81. The source was below the detection limit of ROSAT PSPC before 1993, but it brightened substantially in 1993, with luminosities exceeding the Eddington limit of a 1.5-M compact accretor. It then faded and was not firmly detected in the ROSAT HRI and PSPC observations after 1994. The Chandra image obtained in 2000 May, however, shows an X-ray source at its position within the instrumental uncertainties. The Chandra source is coincident with a star-like object in the Digitized-Sky-Survey. A Hubble image suggests that the optical object may be extended. While these three observations could be of the same object, which may be an X-ray binary containing a black-hole candidate, the possibility that the ROSAT and Chandra sources are two different objects in a dense stellar environment cannot be ruled out. The Hubble data suggests that the optical object may be a globular cluster yet to be identified.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - X-rays: galaxies - black hole physics - stars: binaries: close - clusters: general globular

CDS comments: Source P33 = [IW2001] P33.

Simbad objects: 18

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