[少儿英语]A Hubble Space Telescope Snapshot Survey of Dynamically Close Galaxy Pairs in the CNOC2 Red.pdf

[少儿英语]A Hubble Space Telescope Snapshot Survey of Dynamically Close Galaxy Pairs in the CNOC2 Red.pdf

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[少儿英语]A Hubble Space Telescope Snapshot Survey of Dynamically Close Galaxy Pairs in the CNOC2 Red

Accepted for publication in the Astronomical Journal A Hubble Space Telescope Snapshot Survey1 of Dynamically 5 Close Galaxy Pairs in the CNOC2 Redshift Survey 0 0 2 2 3 4 5 6 D. R. Patton , J. K. Grant , L. Simard , C. J. Pritchet , R. G. Carlberg , K. D. Borne 2 l u J ABSTRACT 8 1 We compare the structural properties of two classes of galaxies at intermediate 1 v redshift: those in dynamically close galaxy pairs, and those which are isolated. 7 1 Both samples are selected from the CNOC2 Redshift Survey, and have redshifts 4 in the range 0.1 z 0.6. Hubble Space Telescope WFPC2 images were 7 0 acquired as part of a snapshot survey, and were used to measure bulge fraction 5 and asymmetry for these galaxies. We find that paired and isolated galaxies have 0 / identical distributions of bulge fractions. Conversely, we find that paired galaxies h p are much more likely to be asymmetric (RT + RA ≥ 0.13) than isolated galaxies. - o Assuming that half of these pairs are unlikely to be close enough to merge, we r t estimate that 40% ± 11% of merging galaxies are asymmetric, compared with s a 9% ± 3% of isolated galaxies. The difference is even more striking for strongly : v asymmetric (RT + RA ≥ 0.16) galaxies: 25% ± 8% for merging galaxies versus i X 1% ± 1% for isolated galaxies. We find that strongly asymmetric paired galaxies r a are very blue, with rest-frame B − R colors close to

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