Other
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.295...43d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 295, p. 43
Other
17
Dwarf Galaxies, Star Formation, Compact Galaxies, Blue Stars, Continuous Spectra, Galactic Nuclei, Near Infrared Radiation, Line Spectra, Starburst Galaxies, Emission Spectra, Galactic Evolution, Globular Clusters
Scientific paper
We present near-infrared 2.1-micron continuum and Br gamma and 1-0S(1) line images of three blue compact dwarf galaxies: II Zw 40, NGC 5253, and He 2-10. Comparison of the morphologies of the emission-ine regions and continuum together with the line ratios shows that in these cases the starbursts are typified by strongly peaked Br gamma and weak diffuse H2 emission, indicating the presence of one or more compact nuclei, and also tidal tails. We consider the possible origins of the H2 emission and conclude that shock excitation in cloud collisions, and hence dynamical processes, such as interactions or mergers, are important. By comparing models of the equivalent width of Br gamma to other age constraints from the literature, we show that the star formation must have occurred not only recently but in a short-duration burst. The current centers of star formation in all three galaxies are of a similar age but, whereas the hotspots in He 2-10 are coeval, we find phase differences between those in NGC 5253. We compare the masses and sizes of the star formation sites to those of present-day globular clusters.
Davies Richard I.
Sugai Hajime
Ward Martin J.
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