Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-09-15
Astronomy and Astrophysics
Astrophysics
12 pages, 2 figures, accepted by ApJ Letters. See the press release on the medium-massive BH (http://chandra.harvard.edu/pre
Scientific paper
10.1086/318878
We present results from observations of the most famous starburst galaxy M82 with the High-Resolution Camera onboard the Chandra X-Ray Observatory. We found nine sources in the central 1' x 1' region, but no source was detected at the galactic center. Comparing the observations on 1999 October 28 and on 2000 January 20, we found four of the nine sources showed significant time variability. In particular, CXOM82J095550.2+694047, which is 9" away from the galactic center, showed extremely large time variability. We conclude that this source is the origin of the hard X-ray time variability of M82 detected with ASCA. Assuming a spectral shape obtained by the ASCA observation, its luminosity in the 0.5 -- 10 keV band changed from 1.2E40 erg/s on 1999 October 28 to 8.7E40 erg/s on 2000 January 20.
Awaki Hisamitsu
Canizares Calude R.
Go Tsuru Takeshi
Kawabe Ryo
Kawai Nobuyuki
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