Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-21
Astronomy and Astrophysics
Astrophysics
10 pages, 5 figures; accepted for ApJ Letters
Scientific paper
10.1086/324456
A long (155 hours) ASCA observation was performed of two ultra luminous compact X-ray sources, Source 1 and Source 2, in the spiral galaxy IC 342. While Source 1 that was in a hard spectral state varied little, Source 2 that was in its soft spectral state varied significantly on a time scale of about one day. The rms variation amplitude amounts to 5% in the 2-10 keV band, but is less than 4% in 0.7-2 keV. The variation involves statistically significant changes in the parameters describing multi-color disk blackbody emission from this source. The variation is possibly periodic, with a period of either 31 $\pm$ 2, hours or 41 $\pm$ 3 hours. Both are consistent with the orbital period of a semi-detached binary formed by a black hole and a main-sequence star of several tens solar masses. These results reinforce the interpretation of these X-ray objects in terms of accreting massive stellar black holes.
Fukazawa Yashushi
Kotoku Jun
Kubota Aya
Makishima Kazuo.
Mizuno Tadahiko
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