Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21547002d&link_type=abstract
American Astronomical Society, AAS Meeting #215, #470.02; Bulletin of the American Astronomical Society, Vol. 42, p.513
Other
Scientific paper
We study the nature and clustering of infrared (IR) galaxies at z 1.5-3 in a 9 deg2 region from the Spitzer Deep, Wide-Field Survey (SDWFS) and the MIPS AGN and Galaxy Evolution Survey (MAGES). Using a method developed by Huang et al. (2009), we identify stellar-dominated IR-luminous galaxies at 1.5 < z < 3 by selecting objects with IRAC colors 0.05 < ([3.6] - [4.5])AB < 0.4 and -0.7 < ([3.6] - [8.0])AB < 0.5 and S(24 micron) > 0.3 mJy. We compute the angular correlation function of this sample over scales of 0.001 - 1 deg. Assuming an empirical redshift distribution, we derive spatial correlation scale lengths, r_0 = 8.6 (-0.8, +0.8) h-1 Mpc for S(24) > 0.3 mJy and 8.2 (-1.2, +1.2) h-1 Mpc for S(24) > 0.5 mJy, with a possible scale length increase at higher 24 micron flux densities, S(24) > 0.6 mJy. We compare our sample to IR-luminous, dust-obscured galaxies (DOGs) at this redshift selected on the basis of their high R - [24] colors. While the DOG sample includes objects with S(24) > 1 mJy, our IR-luminous, stellar-dominated sample contains few bright objects, and is approximately limited to S(24) < 0.6 mJy; high 24-micron emission at z 2 requires a substantial amount of dust heated by AGN. At 0.3 mJy < S(24) < 0.6 mJy, the clustering strength of these two samples are nearly indistinguishable, and they are consistent with the clustering of other massive galaxies at these redshifts. Therefore, we conclude that these objects occupy dark-matter haloes of similar mass, and that these massive galaxies experience IR-active stages as a result both of star-formation and AGN activity with some duty cycle.
Support for this work was provided by NASA through an award issued by JPL/Caltech.
Armus Lee
Block Martin M.
Borys Colin
Brodwin Mark
Brown Malcolm
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