Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.276.1224b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 276, Issue 4, pp. 1224-1244.
Astronomy and Astrophysics
Astronomy
13
Galaxies: Fundamental Parameters, Galaxies: Starburst
Scientific paper
We present, in detail, the morphological analysis of a sample of 15 galaxies of the Montreal blue galaxy (MBG) survey, based on BVRI imaging. The sample consists of starburst nucleus galaxies, mostly with early-type morphologies. We fit elliptical isophotes to the images, and analyse the parameters derived from the fitting procedure, the luminosity profiles, the B-I colour profiles and B-I colour maps. Circumnuclear regions of star formation are identified, corresponding well to the extended Hα emission measured spectroscopically. The dimensions of these extended regions are of the order of kiloparsecs. For barred galaxies, the star formation is more concentrated than for unbarred ones, which tend to have extended starbursts. A high interaction rate for the objects studied is indicated by the frequency of dust, twisted isophotes, and a wide dispersion of colours (similar to Arp-Madore galaxies), which is not correlated with the morphological type. The observed isophotal twists in our sample are related to the presence of bars, for SBa and later types, or to geometrical decoupling, for S0 and E galaxies. The level of `boxiness' and `discyness' is larger than that of normal early-type galaxies, reflecting the disturbed morphology of these objects. The connection of these morphological characteristics with the observed starbursts is highly probable.
Barth Clarissa S.
Coziol Roger
Demers Serge
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