Precision photometry of early-type galaxies in the Coma and Virgo clusters: A test of the universality of the colour-magnitude relation. I - The data. II. Analysis

Details Precision photometry of early-type galaxies in the Coma and Virgo clusters: A test of the universality of the colour-magnitude relation. I - The data. II. Analysis Precision photometry of early-type galaxies in the Coma and Virgo clusters: A test of the universality of the colour-magnitude relation. I - The data. II. Analysis

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..589b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Feb. 15, 1992, p. 589-613. Research supported by S

Astronomy and Astrophysics

Astronomy

270

Astronomical Photometry, Color-Magnitude Diagram, Galactic Clusters, Optical Correction Procedure, Elliptical Galaxies, Interstellar Gas, Red Shift, Seeing (Astronomy), Spiral Galaxies

Scientific paper

We have undertaken a comprehensive study of a large sample of early-type galaxies in the Virgo and Coma clusters. In the first of two papers, we present accurate UVJK photometry for a total of 94 elliptical and SO galaxies. All U- and V-band measurements are based on CCD observations made with the 2.5-m Isaac Newton Telescope. J- and K-band observations for the Coma cluster were made with a chopping photometer at the United Kingdom Infrared Telescope (UKIRT). Virgo J and K-band measurements have been taken from Persson, Frogel & Aaronson. The rms internal scatter of these data are respectively: 0.025, 0.015, 0.03 and 0.03 mag for Virgo U V J and K (60-arcsec aperture) measurements; 0.030, 0.021, 0.026 and 0.027 mag for Coma U, V (1 3-arcsec aperture), J and K (1 7-arcsec aperture) measurements. We have been careful to ensure that the data set is internally homogeneous. We estimate that the photometric zero-points in the two clusters agree to better than 0.01 mag for U and V and 0.02 mag for J and K.
From these measurements, we have derived U - V V- K and J - K colours corrected for redshift, galactic extinction and aperture effects. After allowing for the systematic uncertainties in these corrections, we estimate that the U - V V - K and J - K colour systems in both clusters are matched to better than 0.02, 0.03 and 0.04 mag respectively. This data set is completed by photometric diameter parameters derived from our own V-band data, total V-band magnitudes derived from a combination of our measurements and those of Godwin & Peach and Michard, and velocity dispersions and morphological types taken from the literature. A detailed analysis of colour-magnitude correlations of these galaxies will be presented in Paper II (this issue).

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