Other
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985phdt........17n&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF TORONTO (CANADA), 1985.Source: Dissertation Abstracts International, Volume: 47-05, Section: B, pa
Other
1
Scientific paper
We launched a detailed study of the Amorphous galaxy NGC 3448. We mapped this interacting galaxy and its companion, UGC 6016, in optical and radio continua, and at the 21cm line. B, V, and R images were secured at KPNO with a CCD. A remarkable variation in colour indices is visible across the face of the galaxy. The (B-V) of the southern half is similar to that of the arms of the latest type spirals. The redder regions in the north, and east of the centre are probably obscured by foreground material. The radio continuum emission at 22, 18, 6, and 2cm was mapped at moderate resolution with the VLA. The radio brightness is dominated by nuclear emission. It is hypothesized that NGC 3448 could harbor a central star forming regions like M82. We realised a complete synthesis of the 21cm line emission with the VLA, and were able to separate the HI emission of NGC 3448 from that of its dwarf companion, UGC 6016. The latter has very regular dynamics, and its hydrogen distribution is similar to other galaxies of the same type. The HI morphology and dynamics of NGC 3448 are quite perturbed. A peculiar double velocity profile spatially coincident with the reddest parts of the galaxy was found. It appears to be tidal material reintegrating with the galaxy and causing the obscuration observed in optical. A model of the encounter between NGC 3448 and UGC 6016 was built along the lines of the restricted 3 -body problem. It satisfactorily reproduces most of the large-scale features of NGC 3448, and shows that the shape and dynamics of the galaxy are consistent with a tidal interaction. Data in the FIR and UV confirm the starburst in the central regions of the galaxy. It appears that NGC 3448 was a late-type spiral whose morphology and dynamics were changed by the tidal interaction with UGC 6016. The perturbation of the galaxy equilibrium provoked the starburst by causing interstellar matter to pile up in central regions of the galaxy.
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