Optical structure and star formation in blue compact dwarf galaxies. I. Observations and profile decomposition.

Details Optical structure and star formation in blue compact dwarf galaxies. I. Observations and profile decomposition. Optical structure and star formation in blue compact dwarf galaxies. I. Observations and profile decomposition.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120..207p&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.207-228

Astronomy and Astrophysics

Astrophysics

124

Galaxies: Compact, Photometry, Structure, Fundamental Parameters

Scientific paper

We present new B and R CCD surface photometry for a sample of 4 Blue Compact Dwarf Galaxies (BCDs) and 2 higher luminosity starburst galaxies. We find that the BCD surface brightness profiles (SBPs) can be generally well fitted by the sum of the light of 3 distinct components: 1) an exponential component at large radii, with or without a central flattening which describes the underlying older stellar population; 2) a plateau component at intermediate radii and 3) a gaussian component at small radii. The last 2 components describe the ongoing starburst superimposed on the older stellar component. We apply the 3-component decomposition scheme to 8 more BCDs from the literature and, for the total sample of 14 galaxies, derive structural properties such as central surface brightness and scale length, and perform a deprojection to obtain the luminosity density distribution for each component. We also derive B-R color profiles and find that BCDs show generally a reddening outwards, followed by a blueing beyond a transition radius.

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