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American Astronomical Society, Astrophysical Journal, 2(769), p. 92, 2013

DOI: 10.1088/0004-637x/769/2/92

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Ultra-Luminous X-Ray Sources in the Most Metal Poor Galaxies

Journal article published in 2013 by A. H. Prestwich, Maria Tsantaki, A. Zezas, F. E. Jackson, T. P. Roberts ORCID, R. Foltz, T. Linden, V. Kalogera
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Ultra-Luminous X-ray sources (ULX) are X-ray binaries with Lx>1E^39 ergs/s. The most spectacular examples of ULX occur in starburst galaxies and are now understood to be young, luminous High Mass X-ray Binaries. The conditions under which ULX form are poorly understood, but recent evidence suggests they may be more common in low metallicity systems. Here we investigate the hypothesis that ULX form preferentially in low metallicity galaxies by searching for ULX in a sample of Extremely Metal Poor Galaxies (XMPG) observed with the Chandra X-ray Observatory. XMPG are defined as galaxies with log(O/H)+12