Ellipticity and Twisting Of The Isophotes Of Some Bright Galaxies In Virgo

Roberto Barbon; Leopoldo Benacchio; Massimo Capaccioli; Giuseppe De Biase; Paolo Santin; Giorgio Sedmak

doi:10.1117/12.959812

21 November 1980 Ellipticity and Twisting Of The Isophotes Of Some Bright Galaxies In Virgo

Roberto Barbon, Leopoldo Benacchio, Massimo Capaccioli, Giuseppe De Biase, Paolo Santin, Giorgio Sedmak

Proceedings Volume 0264, Applications of Digital Image Processing to Astronomy; (1980) https://doi.org/10.1117/12.959812
Event: 1981 Los Angeles Technical Symposium, 1980, Los Angeles, United States

Abstract

Ellipticity and twisting of the isophotes of four lenticular and seven elliptical galaxies in the Virgo cluster are presented as a sample of a more complete photometric investigation. This work has been motivated by the increasing importance of this kind of information for the understanding of the spatial structure of E galaxies. The calibrated plate material from the Loiano 1.52 meter and Tautenburg Schmidt telescopes has been digitized with a PDS microdensitometer and analysed by means of the Interactive Numerical Mapping Package (IMP). Ellipticity and orientation profiles are presented in a graphical form together with a preliminary discussion. A correlation has been found between ellipticity and twisting in barred lenticulars which might help in the understanding of some E galaxies such as NGC 4406 and NGC 4374. Twisting has been detected in all of the seven ellipticals of the sample.

Citation Download Citation

Roberto Barbon, Leopoldo Benacchio, Massimo Capaccioli, Giuseppe De Biase, Paolo Santin, and Giorgio Sedmak "Ellipticity and Twisting Of The Isophotes Of Some Bright Galaxies In Virgo", Proc. SPIE 0264, Applications of Digital Image Processing to Astronomy, (21 November 1980); https://doi.org/10.1117/12.959812

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