Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mcdg.proc..209t&link_type=abstract
The Magellanic Clouds and Other Dwarf Galaxies, Proceedings of the Bonn/Bochum-Graduiertenkolleg Workshop, held at the Physikzen
Other
Dynamics Of Dwarf Galaxies, Galaxy Interaction
Scientific paper
NGC 4449 is an active star-forming dwarf galaxy of Magellanic type. From radio observations van Woerden et al. (1975) found an extended H I-Halo around NGC 4449 which is at least a factor of 10 larger than the optical diameter D_25 ~ 5.6 kpc. More recently, Bajaja et al. (1994) and Hunter et al. (1998) discerned details in the H I-halo: a disk-like feature around the center of NGC 4449 and a lopsided arm structure. In a series of simulations we demonstrated that the main features can be obtained by a gravitational interaction between NGC 4449 and another dwarf galaxy, DDO 125. According to these calculations the closest approach between both galaxies happened ~ 3710^8 yr ago at a minimum distance of 30-35 kpc on a nearly parabolic orbit. In that case, the dynamical mass of DDO 125 should not be smaller than 10% of NGC 4449. Before the encounter the observed H I was organized in a disk with a radius of 25-30 kpc around the center of NGC 4449 which had an inclination angle of 550 to 700. The origin of this disk is still not clear, but it might have been a previous additional interaction.
Kohle Sven
Theis Ch
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