The Evolution of Galaxy Morphology for Galaxies in the Canada-France Redshift Survey | Zendy

Sidney van den Bergh | Zendy

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The Evolution of Galaxy Morphology for Galaxies in the Canada-France Redshift Survey

Author(s) -

Sidney van den Bergh

Publication year - 2001

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/321182

Subject(s) - astrophysics , physics , redshift , redshift survey , luminous infrared galaxy , astronomy , elliptical galaxy , peculiar galaxy , galaxy , galaxy group , luminosity , lenticular galaxy , radio galaxy

The images of 229 galaxies in the Canada France Redshift Survey have beenclassified on the DDO system. These observations were combined with previousclassifications of galaxies with known redshifts in the Hubble Deep Field. Thecombined sample provides homogeneous morphological classifications for 425galaxies of known redshift. The fraction of all galaxies that are of types E +S0 + E/S0 appears to remain approximately constant at ~17% over the redshiftrange 0.25 < z < 1.2. Over the same range the fraction of irregular (Ir)galaxies increases from ~5% to ~12%. Part of this increase may be due to mildluminosity evolution of Ir galaxies. The frequency of mergers is found to riseby a factor of two or three over the redshift range covered by the presentsurvey.Comment: 5 files - one text, and 4 postscript figures. Will appear in the August issue of A

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