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Date and Time of the Query: 2019-07-18 T06:14:22 PDT
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For refcode 1990A&A...233..385T:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1990A&A...233..385T Shell structure associated with the starburst galaxy Markarian 717 Y. Taniguchi, S. Ichikawa, M. Hamabe, T. Yamagata, and M. Iye Kiso Observatory, Institute of Astronomy, University of Tokyo, Mitake, Kiso, Nagano 397-01, Japan Department of Astronomy, University of Tokyo, Tokyo 113, Japan National Astronomical Observatory of Japan, Mitaka, Tokyo 181, Japan Received November 2, 1988; accepted July 3, 1989 Abstract. We report a discovery of shell (or ripple) structure associated with the starburst-nucleus galaxy Markarian 717 ( = IC 2551). The shell locates at a radial distance of 36" from the nucleus in the east of the galaxy (PA = 80^deg^. This direction is deflected by about 50{delta} from that of the major axis of the galaxy (PA = 30^deg^. Since this shell structure is detected in all the V-, R-, and I-band CCD images, it is likely that stars are contributing to its radiation. The brightness profile of the main body is well fitted by de Vaucouleurs' r^1/4^ law in the wide range of magnitudes (about 6 mag), implying that Markarian 717 is a spheroidal galaxy. In the SW of the main body (i.e., roughly the opposite side of the shell). luminosity bumps are observed at radii of about 17" and 28". It is possible to regard these bumps as inner shells. The origin of the shell structure and properties of the starburst activity are briefly discussed. Key words: galaxies: elliptical - stars: formation of - galaxies: kinematics and dynamics of - galaxies: Mrk 717
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