Observation of Galaxy Mergers with Chandra and Spitzer

Details Observation of Galaxy Mergers with Chandra and Spitzer Observation of Galaxy Mergers with Chandra and Spitzer

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.0904t&link_type=abstract

American Astronomical Society, AAS Meeting #211, #09.04; Bulletin of the American Astronomical Society, Vol. 39, p.741

Astronomy and Astrophysics

Astrophysics

Scientific paper

Utilizing archived Chandra data, we have examined the X-ray properties of a sample of 14 interacting galaxies from the Spitzer Interacting Galaxies Study (SIGS). Our goal is to look for correlations of X-ray emission with star formation and merger stage, and investigate the association of Ultra-Luminous X-ray sources (ULXs) with interacting galaxies. We found no distinct trends of increased hot-gas X-ray emission or increased XRB emission with increased star formation rate, although higher star formation rates did appear to be weakly associated with increased total X-ray luminosity. Our comparison of merger stage and total X-ray luminosity normalized by the SFR showed no clear evolutionary scheme, which could be due to the fact that the SIGS survey does not include any late stage mergers. In contrast, the total X-ray luminosity normalized by Ks-band magnitude did show a trend of increased luminosity with merger progression. We also found a constant number of ULXs per unit SFR production (with an indication for saturation at the most actively star-forming galaxies). We did not find any trend for the association of ULXs with a particular merger stage. We gratefully acknowledge the NSF REU program awarded to the Astrophysical Observatory at the Harvard-Smithsonian Center for Astrophysics.

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