(No) dynamical constraints on the mass of the black hole in two ULXs

Details (No) dynamical constraints on the mass of the black hole in two ULXs (No) dynamical constraints on the mass of the black hole in two ULXs

2010-11-09

arxiv.org/abs/1011.2155v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

5 pages, 4 figures. Accepted for publication in Astronomische Nachrichten, to appear in the proceedings of the conference "Ult

Scientific paper

We present the preliminary results of two Gemini campaigns to constrain the mass of the black hole in an ultraluminous X-ray source (ULX) via optical spectroscopy. Pilot studies of the optical counterparts of a number of ULXs revealed two candidates for further detailed study, based on the presence of a broad He II 4686 Angstrom emission line. A sequence of 10 long-slit spectra were obtained for each object, and the velocity shift of the ULX counterpart measured. Although radial velocity variations are observed, they are not sinusoidal, and no mass function is obtained. However, the broad He II line is highly variable on timescales shorter than a day. If associated with the reprocessing of X-rays in the accretion disc, its breadth implies that the disc must be close to face-on.

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