Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714712s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #147.12; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of B, R, and H alpha optical imaging of a subsample of galaxies from the Spitzer Local Volume Legacy Survey. The images were analyzed using a set of concentric, co-eccentric ellipses to measure surface brightness profiles and color gradients. While most of the galaxies in this sample have modest to negligible color gradients, some of the galaxies have B-R color gradients greater than 0.4 mag/kpc. Furthermore, the range of values measured for the B-R color gradient is larger for galaxies with absolute magnitudes fainter than -16. Likewise, the scatter in the observed equivalent width gradient is larger for the low mass irregular galaxies. The increased range of observed color gradients in the low mass galaxies may be related to a transition in the dominant mechanisms that regulate star formation in dwarf irregular and spiral galaxies.
Barnes Kate L.
Friberg Stig
LVL Team
Minns C. R.
Sakai Shoko
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