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Paper: New 24 Field VLA Mosaic Imaging of HI in the M81 Group
Volume: 217, Imaging at Radio Through Submillimeter Wavelengths
Page: 374
Authors: Yun, M. S.; Ho, P. T. P.; Lo, K. Y.
Abstract: A previous 12 field mosaic of 21cm HI emission in M81 group has revealed an extensive array of tidal filaments connecting all three core group members M81, M82, and NGC 3077 (Yun et al. 1994). A tidal interaction scenario involving all three galaxies can account for most of the filamentary HI features imaged and has been supported by a numerical calculation (Yun 1997). There are evidence for the HI features extending well beyond the area imaged thus far, particularly towards a fourth member of the group to the southwest, NGC 2976 (Appleton & van der Hulst 1988). Also, additional HI data to the northwest of M82 and southeast of NGC 3077 would help scrutinizing the details of the tidal interaction scenario proposed by our numerical study. Therefore 12 additional fields were observed with the VLA and combined with the existing data to construct a more complete tidal interaction history in M81 group. On the technical side, several different mosaic imaging softwares are tested and compared during the course of image construction.
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