Radio Observations of IXOs in NGC 5204 and NGC 4150

Details Radio Observations of IXOs in NGC 5204 and NGC 4150 Radio Observations of IXOs in NGC 5204 and NGC 4150

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19916105a&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #161.05; Bulletin of the American Astronomical Society, Vol. 34, p.572

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Scientific paper

With the advent of Chandra, highly accurate astrometry of intermediate-luminosity X-ray objects (IXOs) has been possible, allowing follow-up studies at other wavelengths. We have searched for radio counterparts to the IXOs found in NGC 5204 and NGC 4150. Recent Very Large Array (VLA) 3.6 cm observations of both galaxies resulted in non-detections at the 84 microJy level (3 sigma). To our knowledge, this is the first time that targeted radio observations of IXOs have been attempted, so the results are important for deriving limits and constraining the models that have been put forth to explain the IXO phenomenon. We have examined the possibility that these IXOs are intermediate-mass black holes, beamed X-ray binaries, supernovae or background objects and calculated limits on each of these models using our radio emission limits. Based on these limits, it is unlikely that the IXO in NGC 5204 is a supernova or a background object. However, the limits for NGC 4150 are unable to rule out any of the four scenarios mentioned above. NRAO is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Further support for D. S. Wong was provided by NSERC of Canada.

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