Ultra-Luminous Sources in Nearby Galaxies

Details Ultra-Luminous Sources in Nearby Galaxies Ultra-Luminous Sources in Nearby Galaxies

2004-11-01

arxiv.org/abs/astro-ph/0411040v1

Prog.Theor.Phys.Suppl.155:27-44,2004

Astronomy and Astrophysics

Astrophysics

18 pages, 4 figures

Scientific paper

10.1143/PTPS.155.27

I briefly review much of the X-ray and optical data on the nature of the ULXs in nearby galaxies. I present new results on radio emission, finding that the radio is usually rather luminous and extended. I review the X-ray data on timing and spectra. There is no direct evidence in the X-ray data for either geometric or relativistic beaming and in 4 objects direct evidence against beaming. I argue that the X-ray timing and spectral properties of these objects are, in general, not good analogs of AGN or galactic black holes and that the ULX may represent a new mode of accretion only rarely seen in other objects.

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