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Hans Publishers, Astronomy & Astrophysics, (514), p. A85

DOI: 10.1051/0004-6361/200912544

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Ultraluminous X-ray sources out toz~ 0.3 in the COSMOS field

Journal article published in 2010 by V. Mainieri, C. Vignali, A. Merloni, F. Civano, S. Puccetti ORCID, M. Brusa, R. Gilli ORCID, M. Bolzonella, A. Comastri ORCID, G. Zamorani, M. Aller, M. Carollo, C. Scarlata, M. Elvis, T. L. Aldcroft and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Using Chandra observations we have identified a sample of seven off-nuclear X-ray sources, in the redshift range z=0.072-0.283, located within optically bright galaxies in the COSMOS Survey. Using the multi-wavelength coverage available in the COSMOS field, we study the properties of the host galaxies of these ULXs. In detail, we derived their star formation rate from H_alpha measurements and their stellar masses using SED fitting techniques with the aim to compute the probability to have an off-nuclear source based on the host galaxy properties. We divide the host galaxies in different morphological classes using the available ACS/HST imaging. We find that our ULXs candidates are located in regions of the SFR versus M$_star$ plane where one or more off-nuclear detectable sources are expected. From a morphological analysis of the ACS imaging and the use of rest-frame colours, we find that our ULXs are hosted both in late and early type galaxies. Finally, we find that the fraction of galaxies hosting a ULX ranges from ~0.5% to ~0.2% going from L[0.5-2 keV]=3 x 10^39 erg s^-1 to L[0.5-2 keV]= 2 x 10^40 erg s^-1. Comment: 10 pages, 9 figures, accepted for publication in Astronomy & Astrophysics