Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344824e&link_type=abstract
American Astronomical Society, AAS Meeting #213, #448.24; Bulletin of the American Astronomical Society, Vol. 41, p.339
Mathematics
Logic
Scientific paper
There is a growing body of evidence which supports the hypothesis that star forming galaxies preferentially populate environments of low and intermediate galaxy density. The best way to verify and quantify this idea is to obtain an accurate measure of the specific star formation rate in galaxies as a function of their environment. Infrared wavelengths are essential as they measure the reprocessed emission of hot young stars enshrouded in dust, which re-emit the majority of their energy at longer wavelengths. To this end, we choose to look in detail at the Coma cluster and its surrounding environment. There are two immediate benefits with this approach. First, there are a range of environments included - the center of the cluster has a much higher galaxy density than does the outskirts of the cluster, the field, and any cluster filaments. Second, clusters are not homogeneous in their properties, and apart from cosmological evolution in time, clusters have different total masses, degrees of relaxation and X-ray brightness. Coma, being the closest rich galaxy cluster is particularly well studied and many of the above cluster characteristics are well known. In this poster we present infrared luminosities in the JHK and Spitzer IRAC and MIPS bands, as well as optical R-band luminosities and spectra we have gathered for galaxies in the Coma cluster. This data enables us to determine the specific star formation rates and to better understand the activity in galaxies as a function of environment and local galaxy density.
Edwards Louise O. V.
Fadda Dario
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