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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

Bower, Richard G. and Lucey, J. R. and Ellis, Richard S. (1992) 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. Monthly Notices of the Royal Astronomical Society, 254 (4). pp. 589-600. ISSN 0035-8711. doi:10.1093/mnras/254.4.589. https://resolver.caltech.edu/CaltechAUTHORS:20210130-165033012

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Abstract

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 S0 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 (13-arcsec aperture), J and K ( 17-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).


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/254.4.589DOIArticle
http://adsabs.harvard.edu/doi/10.1093/mnras/254.4.589ADSArticle
ORCID:
AuthorORCID
Bower, Richard G.0000-0002-5215-6010
Ellis, Richard S.0000-0001-7782-7071
Additional Information:© 1992 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Accepted 1991 September 17. Received 1991 September 11; in original form 1991 June 20. We would like to thank Dr. C. M. Mountain of the Royal Observatory, Edinburgh for performing the UKIRT observations. UKIRT is operated by the Royal Observatory Edinburg at the Mauna Kea Observatory, Hawaii. The INT is operated on the island of La Palma by the Royal Greenwich Observatory in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisicia de Canarias. RGB, JRL and RSE gratefully acknowledge the funding support of the SERC. We thank STARLINK for the provision of computing facilities.
Funders:
Funding AgencyGrant Number
Science and Engineering Research Council (SERC)UNSPECIFIED
Issue or Number:4
DOI:10.1093/mnras/254.4.589
Record Number:CaltechAUTHORS:20210130-165033012
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210130-165033012
Official Citation:Richard G. Bower, J. R. Lucey, Richard S. Ellis, 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, Monthly Notices of the Royal Astronomical Society, Volume 254, Issue 4, February 1992, Pages 589–600, https://doi.org/10.1093/mnras/254.4.589
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107831
Collection:CaltechAUTHORS
Deposited By: Rebecca Minjarez
Deposited On:11 Feb 2021 17:42
Last Modified:16 Nov 2021 19:06

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