Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21823603c&link_type=abstract
American Astronomical Society, AAS Meeting #218, #236.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present preliminary analysis of the star formation (SF) distribution in the nearby (z 0.03) interacting galaxy clusters Abell (hereafter A) 2197 and A2199 using data from the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7). The purpose of this work is to determine how the cluster distribution appears to affect SF. The SF distribution is compared with X-ray maps of the clusters. The diagnostic diagram, log([O III] / Hβ) vs. log([N II] / Hα), shows that most emission-line (EL) galaxies in both clusters are star-forming as opposed to Seyferts or LINERs. The distribution and equivalent widths of Hα in EL galaxies are plotted, as are surface brightness contours of both EL non-EL galaxies. While the EL and non-EL galaxies are similarly distributed in the smaller of the two clusters, A2197, we find bimodality to the NW and SE in the EL galaxies of A2199. This incongruity is tested using fifth-nearest neighbor density calculations. We interpret this discrepancy as having been caused by the interaction, which enhanced SF in the noted areas of the clusters.
Cohen Seth A.
Wegner Gary. A.
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