[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
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D. R. Patton , J. K. Grant , L. Simard , C. J. Pritchet , R. G. Carlberg , K. D. Borne
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l
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J ABSTRACT
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We compare the structural properties of two classes of galaxies at intermediate
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v redshift: those in dynamically close galaxy pairs, and those which are isolated.
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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
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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
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/ identical distributions of bulge fractions. Conversely, we find that paired galaxies
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p are much more likely to be asymmetric (RT + RA ≥ 0.13) than isolated galaxies.
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o Assuming that half of these pairs are unlikely to be close enough to merge, we
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t estimate that 40% ± 11% of merging galaxies are asymmetric, compared with
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a 9% ± 3% of isolated galaxies. The difference is even more striking for strongly
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v asymmetric (RT + RA ≥ 0.16) galaxies: 25% ± 8% for merging galaxies versus
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X 1% ± 1% for isolated galaxies. We find that strongly asymmetric paired galaxies
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a are very blue, with rest-frame B − R colors close to
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