Journal Article

The formation and evolution of Virgo cluster galaxies – I. Broad-band optical and infrared colours

Joel C. Roediger, Stéphane Courteau, Michael McDonald and Lauren A. MacArthur

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 416, issue 3, pages 1983-1995
Published in print September 2011 | ISSN: 0035-8711
Published online September 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19176.x
The formation and evolution of Virgo cluster galaxies – I. Broad-band optical and infrared colours

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We use a combination of deep optical (gri) and near-infrared (H) photometry to study the radially resolved colours of a broad sample of 283 Virgo cluster galaxies. For most galaxy types, we find that the median gH colour gradient is either flat (gas-poor giants and gas-rich dwarfs) or negative (i.e. colours become bluer with increasing radius; gas-poor dwarfs, spirals and gas-poor peculiars). Later-type galaxies typically exhibit more negative gradients than early types. Given the lack of a correlation between the central colours and axial ratios of Virgo spiral galaxies, we argue that dust likely plays a small role, if at all, in setting those colour gradients. We search for possible correlations between galaxy colour and photometric structure or environment and find that the Virgo galaxy colours become redder with increasing concentration, luminosity and surface brightness, while no dependence on the clustercentric radius or local galaxy density is detected (over a range of ∼2 Mpc and ∼3–16 Mpc−2, respectively). The colours of gas-rich Virgo galaxies correlate with their neutral gas deficiencies, such that these galaxies become redder with higher deficiencies, although part of this correlation is likely driven by a latent morphology–gas deficiency trend. Comparisons with stellar population models suggest that these colour gradients arise principally from variations in stellar metallicity within these galaxies, while age variations only make a significant contribution to the colour gradients of Virgo irregulars. A detailed stellar population analysis based on this material is presented in Roediger et al. (Paper II of this series).

Keywords: galaxies: clusters: individual: Virgo; galaxies: dwarf; galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: spiral; galaxies: stellar content

Journal Article.  8123 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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