Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt.........8e&link_type=abstract
PhD Dissertation, California Univ. Santa Cruz, CA United States
Astronomy and Astrophysics
Astronomy
1
Red Shift, Sky Surveys (Astronomy), Interacting Galaxies, Distribution, Galactic Radiation, Galactic Structure, Color, Galactic Clusters, Line Of Sight, Pencil Beams, Astronomical Spectroscopy
Scientific paper
We examine the dependence of the large scale distribution of galaxies on galaxy color using a medium deep multi-pencil-beam redshift survey at the North Galactic Pole. We find that peaks detected by Broadhurst et al. (1990) appear to be due to transverse structures rather than due to galaxy clusters. By measuring the moments of the distribution of galaxy counts binned along the line of sight, we determine the extent to which the galaxies in these structures are segregated by color. We first compare the moments of the line of sight distribution of the red and blue halves of the galaxy sample and find that the fluctuations in the red galaxy distribution are stronger than those of the blue on all scales out to 60h50-1 Mpc. This result suggests that the structures are dominated by the red galaxies. We check that the effect is not caused entirely by the two largest structures by removing them from the sample and repeating the moment calculations. Next, we check whether the difference in the galaxy distributions represents a true trend with color and is not merely the result of clustering of the reddest galaxies by dividing the sample into three color subgroups and comparing their moments. We find that the moments of the yellow galaxies are indeed intermediate between those of the red and blue galaxies. Finally, we test the extent to which the difference between the red and blue galaxy distributions is due to small-scale clustering by measuring a modified second moment from which we remove the contribution of galaxy pairs contained within a single beam. We find that, while there remains a difference between the red and blue galaxy distributions, its significance is substantially decreased, which suggests that the dominant contribution to the color segregation is small-scale clustering within the transverse structures. Overall, our results suggest that color segregation occurs primarily on scales over which environmentally dependent evolutionary processes such as galaxy-galaxy and galaxy-IGM interactions, may occur.
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