NOAO >   Observing Info >   Approved Programs >   2008A-0224

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Proposal Information for 2008A-0224


PI: Dario Fadda, IPAC-Caltech, fadda@ipac.caltech.edu
Address: NASA Herschel Science Center, Mail Code 100-22, Pasadena, CA 91125, USA

CoI: Andrea Biviano, INAF-Trieste, Italy

Title: Infalling starburst galaxies in the Coma cluster

Abstract: Galaxy clusters live at the intersections of filamentary superstructures constantly accreting galaxies which, during their infall into the denser intra-cluster medium, undergo an accelerated evolution. In the case of the filaments connecting the clusters A1763 and A1770 (z=0.23), which were discovered by us using \em Spitzer and \em Hydra/WIYN observations, a large fraction of infalling galaxies is experiencing a phase of enhanced star formation. We propose to follow- up spectroscopically with \em Hydra/WIYN the population of far- infrared sources of the cluster A1656 (aka Coma) which have been observed with \em Spitzer. A1656 is part of a supercluster and directly connected to the neighboring cluster A1367, so that we expect a similar enhancement of star formation along the A1656-A1367 direction. Although intensively observed with other redshift surveys, only a small fraction of the far-infrared sources in the 1.5^o \times 2^o field observed with \em Spitzer have known redshifts. We propose to target the entire population of 24(micron) sources with \em Hydra on the WIYN telescope. The \em Hydra spectrograph, thanks to its large field of view, is ideal for such a large-scale survey.


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NOAO >   Observing Info >   Approved Programs >   2008A-0224

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