Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342304c&link_type=abstract
American Astronomical Society, AAS Meeting #213, #423.04; Bulletin of the American Astronomical Society, Vol. 41, p.243
Mathematics
Logic
Scientific paper
We present new dynamical models of the merger remnant NGC 7252 including star formation simulated according to various phenomenological rules. By using interactive software to match our model with the observed morphology and gas velocity field, we obtain a consistent model for NGC 7252. In our models, this protoelliptical galaxy formed by the merger of two similar gas-rich disk galaxies which fell together with an initial pericentric separation of 2 disk scale lengths approximately 620 Myr ago. Results from two different star formation rules-- density-dependent and shock-induced-- show prominent differences in predicted star formation rates during and after first passage. Shock-induced star formation yields a prompt starburst at the time of first passage; this may have produced the star clusters that have observed ages around this time. A comparison of the locations of observed clusters with results of our simulations favors shock-induced mechanisms of star formation in NGC 7252. We also present simulated color images of NGC 7252 at present time, constructed by incorporating population synthesis models with radiative transfer and simulated dust attenuation in our simulation. These images reflect current star formation regions in NGC 7252 and can be compared to the observed morphology in various bands.
Barnes Joshua E.
Chien Li-Hsin
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