Far-IR Measurement of AGN and Starburst Activity in the First Look Survey

Details Far-IR Measurement of AGN and Starburst Activity in the First Look Survey Far-IR Measurement of AGN and Starburst Activity in the First Look Survey

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3326m&link_type=abstract

Spitzer Proposal ID #3326

Physics

Scientific paper

The infrared fluxes of nearly every galaxy observed so far can be fitted with a combination of these D, B, and S components, which have an underlying physical basis: the strength of B gives a measure of the recent rate of star formation, while the strength of S (in those minority of galaxies where it is present) is associated with Seyfert activity. We will use the flux ratios of the sources detected in all three MIPS bands to quantify how much of their emission comes from a quiescent disk, a starburst, or a Seyfert nucleus. The MIPS color differences between the D, B and S SEDs are so large (about an order of magnitude difference in flux ratios), that high precision photometry is not even essential. Since the MIPS classification is somewhat z-dependent, we will use the IRAC and R-band photometry of our MIPS sources to sort them approximately by redshift. We will compare estimates of the luminosity functions of starburst power and accretion power from z of 0 to above 1 In the First Look Survey field, our galaxy evolution models predict that we will have over 600 sources with a 5σ or better detection in all 3 MIPS bands. We have measured photometry of all the IRAC, MIPS and R-band sources within the early release field of FLS. These measurements of source counts, magnitudes and multiwavelength colors fully confirm the feasibility of our program.

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