A MIPS Survey of a Representative Sample of Galaxy Groups

Details A MIPS Survey of a Representative Sample of Galaxy Groups A MIPS Survey of a Representative Sample of Galaxy Groups

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40044m&link_type=abstract

Spitzer Proposal ID #40044

Physics

Scientific paper

Most galaxies in the universe are members of groups. Groups are, therefore, an important laboratory for studying the processes associated with galaxy formation and evolution. To better understand the group environment and its role on galaxy evolution, we are carrying out the first detailed optical, X-ray and HI study of an unbiased sample of nearby groups. Each group in our sample is being observed with the IMACS wide-field multi-object spectrograph on the Magellan I telescope, XMM-Newton and the GMRT. Our existing data suggests that a large fraction of group galaxies are undergoing active star formation and that the level of star formation is linked to the evolutionary stage of the group itself. However, our current star formation estimates may be significantly underestimated due to dust obscuration and the fact that our spectroscopic slits cover only the central regions of each galaxy. To obtain more robust estimates of the star formation properties, we propose a MIPS 24 and 70 micron imaging survey of our group sample. The proposed MIPS observations will probe to very low star formation rates (0.1 solar mass per year) allowing for an accurate census of the star formation activity in each system. The combination of our existing IMACS, XMM and GMRT data with the proposed MIPS observations will allow us to address the following questions:1) How do the star formation rates of galaxies in groups vary with the evolutionary state of the group?, 2) Are dusty starbursts common in galaxy groups?, 3) How have the galaxy populations in groups evolved over time? and 4) What mechanisms drive galaxy evolution in groups?

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