Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...202...41k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 202, no. 1-2, Aug. 1988, p. 41-54.
Astronomy and Astrophysics
Astrophysics
8
Astronomical Spectroscopy, Compact Galaxies, Galactic Evolution, Galactic Nuclei, Emission Spectra, Galactic Rotation, H I Regions, H Ii Regions, Red Shift, Star Formation
Scientific paper
The blue compact galaxy II Zw 23 shows a system of radial filaments, whose nature has been examined using optical imaging and spectroscopy, and radio continuum mapping. It is proposed that this galaxy is undergoing a protracted episode of star formation fuelled by infall from a massive H I envelope, thus resembling conditions during the cosmological epoch of galaxy formation. This episode might have been triggered by the passage of a companion. Radio emission indicates the presence of a significant magnetic field in material now entering the galaxy for the first time, perhaps suggesting that seed fields for dynamo amplification are already present in low-density clouds. The properties inferred for II Zw 23 before this stage are briefly considered in comparison with such objects as QSO Lyman-alpha absorption clouds, and in the context of the history of the intergalactic medium.
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