EDP Sciences
Free access
Volume 410, Number 1, October IV 2003
Page(s) 139 - 141
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20031329

A&A 410, 139-141 (2003)
DOI: 10.1051/0004-6361:20031329

Research Note

Radio emission and the optical isophotal twist of radio-loud ellipticals

Gopal-Krishna1, A. R. Dhakulkar2, P. J. Wiita3 and S. Dhurde2

1  National Centre for Radio Astrophysics, TIFR, Pune University Campus, Pune 411007, India
2  Department of Physics, University of Pune, Pune 411007, India
3  Dept. of Physics and Astronomy, MSC 8R0314, Georgia State University, Atlanta, GA, 30303-3088, USA

(Received 23 April 2003 / Accepted 22 August 2003)

Using the surface photometric analysis data for a well defined sample of 79 nearby radio galaxies ( $z \le 0.12$), it is shown that the level of radio emission associated with an elliptical galaxy during the radio-loud phase is related to the presence of large amounts of isophotal twist in its optical image. In particular, radio galaxies with $P_{\rm 408} > 3 \times 10^{25}$ W Hz -1 appear to show a preference to be associated with elliptical hosts exhibiting an isophotal twist in excess of $\sim $20 $^{\circ}$.

Key words: galaxies: active -- galaxies: elliptical and lenticular -- galaxies: formation -- galaxies: interactions -- galaxies: photometry -- radio continuum: galaxies

Offprint request: Gopal-Krishna, krishna@ncra.tifr.res.in

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© ESO 2003