SIMBAD references

2015ApJ...802L..27B - Astrophys. J., 802, L27 (2015/April-1)

Spectroscopic studies of an ultraluminous supersoft X-ray source in M81.

BAI Y., LIU J. and WANG S.

Abstract (from CDS):

Ultraluminous supersoft X-ray sources (ULSs) exhibit supersoft X-ray spectra with blackbody temperatures below 0.1 keV and bolometric luminosities above 1039 ergs/s. In this Letter, we report the first optical spectroscopic observations of a ULS in M81 using the LRIS spectrograph on the Keck I telescope. The detected Balmer emission lines show a mean intrinsic velocity dispersion of 400±80 km/s, which is consistent with that from an accretion disk. The spectral index of the continuum on the blue side is also consistent with the multi-color disk model. The Hα emission line exhibits a velocity of ∼180 km/s relative to the local stellar environment, suggesting that this ULS may be a halo system in M81 belonging to an old population. No significant shift is found for the Hαemission line between two observations separated by four nights.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M81 - X-rays: binaries

Simbad objects: 3

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