Relative Fraction of E, S0, and Strong Barred Galaxies in Groups and Clusters in the Nearby Universe, 0 Less than Z Less than 0.066, as a Function of Redshift

Details Relative Fraction of E, S0, and Strong Barred Galaxies in Groups and Clusters in the Nearby Universe, 0 Less than Z Less than 0.066, as a Function of Redshift Relative Fraction of E, S0, and Strong Barred Galaxies in Groups and Clusters in the Nearby Universe, 0 Less than Z Less than 0.066, as a Function of Redshift

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21941707g&link_type=abstract

American Astronomical Society, AAS Meeting #219, #417.07

Astronomy and Astrophysics

Astronomy

Scientific paper

A Statistical analysis of 903 groups and 56 clusters (with a total of 10,316 galaxies) has been done in order to estimate the relative fraction of E, S0, and strong barred (SB) galaxies in the redshift interval 0 < z < 0.066. Our sample has been taken from the published catalogs: a) Nearby Galaxy (Huchra & Geller 1982), CfA (Geller & Huchra 1983), Tully Catalog (Tully 1987) and Abell Clusters (Dressler 1980). Our results, in terms of median values expressed in percentages, for groups and clusters (each with more than 10 galaxies) are:
a) SB/(S+SB) decreases from 43 {+16}{-14} % at z=0, to 28 {+10}{-8} % at z=0.031, to 23 {+8}{-11} % at z=0.066,
b) S0/N increases from 0 {+15}{-0} % at z=0, to 33 {+5}{-7} % at z=0.066,
c) E/N increases from 0 {+17}{-0} % at 0 < z < 0.0099 to 10 {+11}{-2} % at z=0.0129 and stays relatively constant at 11 {+8}{-3} % at z=0.066, and finally,
d) the ratio S0/E increases from 0 at z=0, to S0/E=0.40 {+0.53}{-0.10} at z=0.0129, to S0/E=0.67 {+1.2}{-0.33} at z=0.031, to S0/E=2.5 {+0.83}{-0.83} at z=0.031, and finally to S0/E=3.0 {+2.2}{-1.0} at z=0.066.
Our result for the median value of the relative fraction of SB galaxies in groups and clusters (each with more than 10 galaxies) does not agree with the optical r-band fraction of 48 % reported by Barazza et al. (2008) in the interval 0.01 < z < 0.03.
JAG-B acknowledges financial support from DGAPA (UNAM), Mexico grant IN108011-2.

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