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High-Resolution Imaging of Faint Blue Galaxies | | Matthew Colless
; David Schade
; T J Broadhurst
; R S Ellis
; | | Date: |
17 Dec 1993 | | Subject: | astro-ph | | Abstract: | We have used HRCam on the CFHT to obtain subarcsecond images of 26 galaxies with z=0.1--0.7. The primary sample of 17 galaxies have enhanced star formation indicated by [OII] equivalent widths greater than 20AA, while the comparison sample of 9 galaxies have equivalent widths less than 10AA. By fitting disks or bulges to BVI images we derive scalelengths for the blue and red stellar populations and locate the star-formation in each galaxy. These moderate-redshift galaxies generally have straightforward low-redshift analogues, in that their colours, sizes and luminosities are consistent with those of various types of z$approx$0 galaxies. The star-forming objects have structures consistent with the full range of present-day disk galaxies, and absolute magnitudes M$^ast$$-$1 to M$^ast$+5. Some have star-formation concentrated in their nuclei but in most it occurs across the entire disk. We find companions at projected distances closer than 10 kpc for 30% of the star-forming galaxies, whereas none of the comparison sample have such close companions. This provides the first direct evidence linking interactions or mergers to the increased fraction of star-forming field galaxies at moderate redshifts. | | Source: | arXiv, astro-ph/9401028 | | Services: | Forum | Review | PDF | Favorites | |
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