The Lack of Halo Ultraluminous X-ray Sources

Details The Lack of Halo Ultraluminous X-ray Sources The Lack of Halo Ultraluminous X-ray Sources

2006-09-11

arxiv.org/abs/astro-ph/0609284v1

Astrophys.J.651:L21-L24,2006

Astronomy and Astrophysics

Astrophysics

4 pages accepted to ApJL

Scientific paper

10.1086/509076

The premise that Ultraluminous X-ray sources (ULXs) exist beyond the optical extent of nearby galaxies is investigated. A published catalog containing 41 ULX candidates located between 1 and ~3 times the standard D_{25} isophotal radius of their putative host galaxies is examined. Twenty-one of these sources have spectroscopically-confirmed distances. All 21 are background objects giving a 95% probability that at least 37 of the 41 candidates are background sources. Thirty-nine of the 41 sources have X-ray-to-optical flux ratios, -1.6

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