Computer Science
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.182p&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Computer Science
Compact Objects
Scientific paper
We present a new Chandra observation of the nearby collisional ring galaxy NGC 922. NGC 922 is undergoing a violent burst of star formation as density waves are driven through the disk as a result of the collision. It is similar to the famous Cartwheel galaxy, except that the metallicity is somewhat higher and star formation rate lower. Our primary science goal is to determine whether a low metallicty environment is required to form the most luminous X-ray sources (L_x>10^{40} ergs s^{-1}). We find a total of 14 bright X-ray sources, 7 of which are ULX (L_x>10^{39} ergs s^{-1}). One source has L_x˜ 10^{40} ergs s^{-1}. The X-ray sources are associated with the H-alpha ring. However, they are NOT associated with the brightest H-alpha patches, suggesting that the ULX phase starts >1×10^{7} years after the starburst. Like the Cartwheel, the X-ray luminosity function of NGC 922 has a slope close to that of the ``cannonical'' HMXB slope of Gilfanov et al 2004. We conclude that NGC 922 is forming ULX as efficiently as the Cartwheel (after allowing for the difference in the star formation rate). We do not see a strong metallicity effect.
Galache Jose
Kalogera Vassiliki
Kilgard Roy
Linden Tim
Prestwich Andrea
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