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Identification of Optical Counterparts of ULX sources

Published online by Cambridge University Press:  12 May 2006

Carlos M. Gutiérrez  and
Martín López-Corredoira
Carlos M. Gutiérrez
Affiliation:
Instituto de Astrofísica de Canarias, 38200 la Laguna, Tenerife, SPAIN email: cgc@ll.iac.es, martinlc@ll.iac.es
Martín López-Corredoira
Affiliation:
Instituto de Astrofísica de Canarias, 38200 la Laguna, Tenerife, SPAIN email: cgc@ll.iac.es, martinlc@ll.iac.es
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Abstract

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We present the results of an on-going program for the identification and characterization of optical counterparts of Ultra-Luminous X-ray (ULX) sources. The targets have been selected from the catalogues by Colbert & Ptak (2002) and Swartz et al. (2004). A clear identification based on unambiguous optical spectral features was possible for 26 objects. A large number of objects result to be QSOs at higher redshift than the putative parent galaxy, and other ULXs seem to be associated to HII regions. In a few cases the optical counterpart results a foreground star in our galaxy. The observational program will continue to obtain a representative sample for statistical studies.

Keywords

X-rays: Ultra-luminous sources
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S230: Populations of High Energy Sources in Galaxies , August 2005 , pp. 310 - 311
Copyright
2006 International Astronomical Union