Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348301l&link_type=abstract
American Astronomical Society, AAS Meeting #213, #483.01; Bulletin of the American Astronomical Society, Vol. 41, p.452
Astronomy and Astrophysics
Astronomy
Scientific paper
We measured the UV-optical color dependence of galaxy clustering in the local universe. Using the excellent separation of
red sequence and blue sequence in the NUV - r color-magnitude diagram, we separate the galaxies into three subsample: red, green and blue. We find that the two dimension correlation function (2DCF) for both red and green galaxies show strong redshift space distortion on small scale -- finger-of-God effect, with green galaxies having a slightly lower amplitude. On large scale, 2DCF for all three sample show the effect of large-scale streaming from coherent infall. The projected auto-correlation function for red and green galaxies fit with a power-law with slope 1.9 and r0 = 7.1 and 5.3. For blue sequence galaxies, projected correlation function display a strong inflection at around 1 Mpc/h, with an excess of large scale clustering. Our results suggest that the majority of blue galaxies are likely central galaxies in less massive halos, while the majority of red and green galaxies are satellites, in clusters and groups respectively.
Loh Yeong-Shang
Rich Robert Michael
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