Photometric and Morphological Properties of Nearby Cluster Galaxies

Details Photometric and Morphological Properties of Nearby Cluster Galaxies Photometric and Morphological Properties of Nearby Cluster Galaxies

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apjs..153..397b&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 153, Issue 2, pp. 397-409.

Astronomy and Astrophysics

Astronomy

2

Galaxies: Clusters: General, Galaxies: Photometry, Galaxies: Structure

Scientific paper

Photometric observations are presented for 8747 galaxies in the fields of 28 clusters with redshifts in the range 0.05The present analysis focuses on the sequence of luminous red galaxies that form a tight correlation in the color-magnitude plane. An ensemble cluster constructed from the full sample shows the red sequence clearly and the observed dispersion-not corrected for observational errors-is σ(V-I)=0.071+/-0.006 down to MI(AB)=-19.5. Selecting only early-type galaxies on the basis of their fractional bulge luminosity (B/T) reduces the observed dispersion to σ(V-I)=0.050+/-0.006 mag, a significantly smaller dispersion than the full sample at more than the 95% confidence level. The slope of the color-magnitude relation in (V-I)/I is -0.023+/-0.006.
This set of clusters shows a red sequence that has the same mean color in all clusters (V-I)AB=0.91+/-0.03 (measured at MI(AB)=-23) and has the same intrinsic dispersion, δ(V-I)=0.04+/-0.01, in all clusters within the observational errors. Thus, these clusters form a remarkably homogeneous family as represented by their luminous red galaxy populations.
Based on observations obtained at the Warsaw 1.3 m Telescope at Las Campanas Observatory, Chile.

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