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Photometric properties of dwarf galaxies in the Coma cluster: radial dependence

Published online by Cambridge University Press:  06 October 2004

Yutaka Komiyama ,
Sadanori Okamura ,
Masafumi Yagi ,
Nobunari Kashikawa ,
Bianca M. Poggianti ,
Terry J. Bridges ,
Bahram Mobasher  and
Dave Carter
Yutaka Komiyama
Affiliation:
Subaru Telescope, Hilo, HI, USA email: [email protected]
Sadanori Okamura
Affiliation:
Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo, Japan
Masafumi Yagi
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo, Japan
Nobunari Kashikawa
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo, Japan
Bianca M. Poggianti
Affiliation:
Osservatorio Astronomico di Padova-INAF, Padova, Italy
Terry J. Bridges
Affiliation:
Department of Physics, Queen's University, Kingston, Canada
Bahram Mobasher
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA
Dave Carter
Affiliation:
Liverpool John Moores University, Birkenhead, Wirral, UK
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Abstract

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Photometric properties (effective surface brightness, effective radius, radial profile index, axis ratio, color, color gradient) of 328 galaxies in the Coma cluster fainter than $R=15$ mag are examined as a function of the distance from the cluster center. No significant gradient is found for the effective surface brightness, effective radius and radial profile index. The distribution of axis ratios shows a concentration of round galaxies at the cluster center in the magnitude range $16.5 \lt R \lt 18$; most of these are found to be old and to have intermediate metal abundance, suggesting that they are nucleated dwarf ellipticals. On the other hand, we find a significant gradient in color, in the sense that galaxy colours become bluer with increasing distance from the cluster center. We conclude that this color gradient represents a metallicity gradient.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUC195 , March 2004 , pp. 429 - 431
Copyright
© 2004 International Astronomical Union