EDP Sciences
Free access
Volume 381, Number 1, January I 2002
Page(s) 6 - 12
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011379

A&A 381, 6-12 (2002)
DOI: 10.1051/0004-6361:20011379

Effect of the environment on the fundamental plane of elliptical galaxies

E. A. Evstigneeva1, V. P. Reshetnikov1, 2 and N. Ya. Sotnikova1

1  Astronomical Institute of St. Petersburg State University, 198504 St. Petersburg, Russia
2  Isaac Netwon Institute of Chile, St. Petersburg Branch, Russia

(Received 11 May 2001 / Accepted 17 September 2001 )

We present an analysis of the location of interacting E/S0 galaxies on the Fundamental Plane (FP). Using the NEMO package, we performed simulations of close encounters and mergers of two self-gravitating spherical galaxies. Two models for encounting galaxies - Plummer's and Hernquist's - were used. The number of particles ranged from 20 000 to 50 000 per galaxy. The changes of central density, half-mass radius and central velocity dispersion were analysed. It was found that close encounters between galaxies alter noticeably the above parameters within a very short time interval (10 7-10 8 years) just before the final merger. The amplitudes of parameter changes strongly depend on the initial mass concentration of a model. In some experiments we considered an encounter of two spherical galaxies with dark matter components. The effect of parameter changes was less pronounced than for the experiments without a dark halo. The results of the simulations were used to discuss the FP for interacting early-type galaxies.

Key words: galaxies: kinematics and dynamics -- techniques: photometric

Offprint request: E. A. Evstigneeva, katya@gong.astro.spbu.ru

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