Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.5008l&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #50.08; Bulletin of the American Astronomical Society, Vol. 27, p.1359
Astronomy and Astrophysics
Astronomy
3
Scientific paper
Recent 18cm VLBA images of the ultraluminous IR galaxies UGC5101 and NGC7469 are presented. In combination with 15GHz and 22GHz VLA A-array images of these two objects, we have spatial information on all scales down to about 6 milliarcseconds. The VLBA images show several bright knots of emission which are generally slightly resolved, and an overall structure which is quasi-linear, with total extent about 45 pc. In addition, there is diffuse emission to the SE in UGC5101 which can be identified with a shoulder of emission seen in the 0.1 arcsecond resolution VLA images. This forms the start of a ridgeline of emission that can be traced out to over 1 arcsecond, and the overall structure of the source is therefore suggestive of a curved jet morphology. Based on energetic arguments, the resolved knots argue against a supernova interpretation of the parsec-scale emission in luminous IR galaxies, and at least in UGC5101, the overall structure suggests that a major portion of the radio emission from this galaxy is AGN-related.
Lonsdale Carol J.
Lonsdale Colin J.
Smith Harding E.
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