SIMBAD references

2001ApJ...561L..73S - Astrophys. J., 561, L73-L76 (2001/November-1)

A possible X-ray periodicity at several tens of hours of an ultraluminous compact X-ray source in IC 342.

SUGIHO M., KOTOKU J., MAKISHIMA K., KUBOTA A., MIZUNO T., FUKAZAWA Y. and TASHIRO M.

Abstract (from CDS):

A long (155 hr) ASCA observation was performed of two ultraluminous compact X-ray sources, source 1 and source 2, in the spiral galaxy IC 342. While source 1, which was in a hard spectral state, varied little, source 2, which was in its soft spectral state, varied significantly on a timescale of about 1 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 multicolor disk blackbody emission from this source. The variation is possibly periodic, with a period of either 31±2 or 41±3 hr. Both are consistent with the orbital period of a semidetached binary formed by a black hole and a main-sequence star of several tens of solar masses. These results reinforce the interpretation of these X-ray objects in terms of accreting massive stellar black holes.

Abstract Copyright:

Journal keyword(s): Black Hole Physics - Galaxies: Spiral - X-Rays: Galaxies

CDS comments: Sources 1 and 2 are [FT87] IC 342 1, 2

Simbad objects: 6

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2020.09.28-08:54:37

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