Mathematics – Logic
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20114802g&link_type=abstract
American Astronomical Society Meeting 201, #148.02; Bulletin of the American Astronomical Society, Vol. 35, p.574
Mathematics
Logic
Scientific paper
We present an analysis of fractions of late type cluster galaxies as a function of redshift using 514 clusters (0.02 z 0.3) selected from the SDSS Cut & Enhance galaxy cluster catalog. We analyze the fraction of late type galaxies in four independent ways using: restframe g-r color, u-r color, galaxy profile fitting and concentration index. The first corresponds to the one used in the classical Butcher-Oemler analyses. The last three are more sensitive to the morphologies of galaxies. In all four cases, we find an increase in the fraction of late type galaxies toward increasing redshift with greater than a 99.9% significance level. The results show cluster galaxies do, in fact, change colors as has been seen in the Butcher-Oemler effect. In addition, they change their morphology toward higher redshift as if showing a morphological equivalence to the Butcher-Oemler effect. We also find a slight tendency of richer clusters having lower values of late type fractions. The trend might provide possible evidence of a ram pressure stripping, where a richer cluster has a larger effect from ram pressure due to its higher temperature.
Goto Tomotsugu
Okamura Sadanori
SDSS Collaboration
Yagi Masafumi
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