Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-24
Mon.Not.Roy.Astron.Soc. 316 (2000) 569
Astronomy and Astrophysics
Astrophysics
42 pages, LaTex. Accepted by: MNRAS, 13 Mar 2000
Scientific paper
10.1046/j.1365-8711.2000.03532.x
We quantify the amplitude of the lopsidedness, the azimuthal angular asymmetry index, and the concentration of star forming regions, as represented by the distribution of the H$\alpha$ emission, in a sample of 78 late-type irregular galaxies. We bin the observed galaxies in two groups representing blue compact galaxies (BCDs) and low surface brightness dwarf galaxies (LSBs). The light distribution is analysed with a novel algorithm, which allows detection of details in the light distribution pattern. We find that while the asymmetry of the underlying continuum light, representing the older stellar generations, is relatively small, the H$\alpha$ emission is very asymmetric and is correlated in position angle with the continuum light. We test a model of random star formation over the extent of a galaxy by simulating HII regions in artificial dwarf galaxies. The implication is that random star formation over the full extent of a galaxy may be generated in LSB dwarf-irregular galaxies but not in BCD galaxies.
Almoznino Elchanan
Brosch Noah
Heller Ana B.
Salzer John Joseph
van Zee Liese
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