Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21540906b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #409.06; Bulletin of the American Astronomical Society, Vol. 42, p.234
Other
Scientific paper
We compute the two-point image correlation function for bright galaxies in the seventh data release of the Sloan Digital Sky Survey (SDSS) over angular scales 0.01 arcmin to 120 arcmin and projected separations 0.01 Mpc to 10 Mpc. We restrict our analysis to SDSS galaxies with spectroscopic redshifts and we find strong evidence for intrinsic alignment of the galaxy images. On scales greater than 40 kpc, the intrinsic alignment of the SDSS galaxy images compares well with the intrinsic alignment of galaxy images in a LCDM universe, provided we impose Gaussian-random errors on the position angles of the theoretical galaxies with a dispersion of 25 degrees. Without the inclusion of these errors, the amplitude of the two-point image correlation function for the theoretical galaxies is a factor of 2 higher than it is for the SDSS galaxies. We interpret this as a combination of modest position angle errors for the SDSS galaxies, as well as a need for modest misalignment of mass and light in the theoretical galaxies. The intrinsic alignment of the SDSS galaxies shows no dependence on the specific star formation rates of the galaxies and, at most, a very weak dependence on the colors and stellar masses of the galaxies. At the 3 sigma level, however, we find an indication that the images of the most luminous SDSS galaxies are more strongly aligned with each other than are the images of the least luminous SDSS galaxies. This work was supported by NSF grant AST-0708468.
Agustsson Ingolfur
Brainerd Tereasa G.
Edmonds Jeffrey A.
Madsen Chad A.
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