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Infrared Properties of Star Forming Dwarf Galaxies: II. Blue Compact Dwarf Galaxies in the Virgo Cluster 1

By Vaduvescu Ovidiu and Richer Michael G

Abstract

A sample of 16 blue compact dwarf galaxies (BCDs) in the Virgo Cluster has been imaged in the near-infrared (NIR) in J and Ks on the 2.1m telescope at OAN-SPM in Mexico. Isophotes as faint as µJ = 24 mag arcsec −2 and µKs 23 mag arcsec −2 have been reached in most of the targets. Surface brightness profiles can be fitted across the whole range of radii by the sum of two components: a hyperbolic secant (sech) function, which is known to fit the light profiles of dIs, and a Gaussian component, which quantifies the starburst near the centre. Isophotal and total fitted NIR magnitudes have been calculated, along with semimajor axes at µJ = 23 mag arcsec −2 and µKs = 22 mag arcsec −2. The diffuse underlying component and the young starburst have been quantified using the profile fitting. Most color profiles show a constant color, between J − Ks = 0.7 to 0.9 mag. The diffuse component represents the overwhelming majority of the NIR light for most BCDs, the starburst enhancing the flux by less than abou

Year: 2005
OAI identifier: oai:CiteSeerX.psu:10.1.1.316.3710
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