Close pairs of galaxies in deep sky surveys

Details Close pairs of galaxies in deep sky surveys Close pairs of galaxies in deep sky surveys

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337...34z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 1, 1989, p. 34-44.

Astronomy and Astrophysics

Astrophysics

118

Astronomical Photometry, Galactic Clusters, Angular Correlation, Color, Interacting Galaxies, Interactions, Magnitude, Ubv Spectra

Scientific paper

A largely complete sample of 20 close pairs of faint galaxies, separated by less than 4.5 arcsec, is studied. The colors of the galaxy pairs indicate recently enhanced star formation in some systems, but generally the distribution of the colors and size of the galaxies in pairs is not significantly different from that of equally faint field galaxies. There is some evidence for an overabundance of pairs of galaxies separated by about 3.0 arcsec. A comparison of the number of close galaxy pairs in the faint sample to the number found in comparable nearby studies suggests that the frequency of interacting galaxies increases as (1 + z) exp 4.0 + or - 2.5. This result lends observational support to the hypothesis that interactions were more common in the past than they are now.

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