Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21841011j&link_type=abstract
American Astronomical Society, AAS Meeting #218, #410.11; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present age constraints on 13 X-ray binaries located within the drop-through ring galaxy NGC 922. Star-formation is ongoing within NGC 922 as a result of a shock-wave propagating through the galaxy, caused by a collision between NGC 922 and a neighbouring dwarf galaxy 330 Myrs ago. The majority of the sources are associated with the ongoing star-formation, which is occurring in both a ring close to the edge of the galaxy, and in a region close to the galactic nucleus. By estimating the ages of clusters associated with these sources, we find that those associated with star-formation are no more than 10 Myrs old. Those that are not associated with star-formation have age constraints much higher than this. The X-ray spectral characteristics of the binaries vary from one to the next. We see that both the older sources and the sources located within the star-forming ring have highly absorbed spectra, unlike the more central sources, whose spectra display low levels of absorption.
Chandar Rupali
Jackson Floyd
Prestwich Andrea
Rangelov Blagoy
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