The clustering and environment of ULIRGs at 0.7<z<1.5

Details The clustering and environment of ULIRGs at 0.7<z<1.5 The clustering and environment of ULIRGs at 0.7<z<1.5

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40455r&link_type=abstract

Spitzer Proposal ID #40455

Physics

Scientific paper

We propose to use MIPS scan mapping at 24 microns to map an 0.65 sq deg field with 6208 galaxy redshifts from the DEEP2 redshift survey, to a flux limit of 205 micro-Jy (5 sigma). This depth is sufficient to detect ultraluminous infrared galaxies (L_IR > 10^12 Lsolar) to z=1.5, the limit of the DEEP2 redshifts. There are only 35 ULIRGs with redshifts in the existing overlap field between DEEP2 + MIPS, the Extended Groth Strip; mapping this field will detect ~ 54 ULIRGs with redshifts, more than doubling the existing sample. ULIRGs are thought to be the sites of extreme starbursts and/or AGN produced in massive, gas-rich mergers. They may mark formation events for massive elliptical galaxies, in which case they should be highly clustered. We will use the MIPS 24 micron detections and the thousands of galaxy redshifts to measure ULIRG-galaxy clustering and the ULIRG environment, group membership, and pair fraction, to constrain the nature of ULIRGs, mechanisms for their triggering, and what types of galaxies they may evolve into. The key ingredients for this study are large area coverage and dense sampling of spectroscopic redshifts; because the 24 micron data does not have to be very deep, it is economical in observing time. Because ULIRGs are rare, especially at low z, most of the ULIRGs will be at z>1 where photometric redshifts are less reliable; the high-quality spectroscopic redshifts provided by the DEEP2 data are key to this project.

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