FIRST radio counterpart candidates to ULXs: a catalogue

Details FIRST radio counterpart candidates to ULXs: a catalogue FIRST radio counterpart candidates to ULXs: a catalogue

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ap%26ss.309..147p&link_type=abstract

Astrophysics and Space Science, Volume 309, Issue 1-4, pp. 147-150

Physics

X-Ray: Galaxies, X-Ray: Stars, Radio Continuum: Galaxies, Radio Continuum: Stars, X-Ray: Binaries, Black Hole Physics

Scientific paper

Ultraluminous X-ray sources (ULXs) are the most luminous discrete X-ray sources (excluding AGNs) in the local Universe with observed luminosities above, and in many cases in excess of, 1039 erg s-1. Their physical nature is still uncertain, and many models have been proposed to explain their unusual luminosities. Some of them favour the possible nature of these objects as extragalactic microquasars with strong beaming effects. Others, instead, rely on accretion onto intermediate-mass black holes. In any case, both interpretations offer perspectives for possible gamma-ray detections by future space missions. In order to help to constrain at present the ULX physical nature, we provide here an account of our search for radio counterparts to ULXs located in nearby galaxies, based on a systematic cross-identification of the most recent, available and extensive ULX catalogues and radio archival data. Although we ended up with 70 positional coincidences, most of them were located within the nuclear regions of these galaxies, and thus, they do not represent true ULXs. However, among these sources we identify 11 remarkable cases not previously reported of ULX and radio emission coincidence. Future follow up of these promising cases with a multi-wavelength approach could be useful to improve our understanding of the ULX phenomenon.

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