Issue |
A&A
Volume 404, Number 3, June IV 2003
|
|
---|---|---|
Page(s) | 819 - 830 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20030488 | |
Published online | 06 June 2003 |
Projection effects on the FP thickness*
A Monte-Carlo exploration
1
INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
2
Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
3
Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
4
Princeton University Observatory, Peyton Hall, Princeton, NJ 08544-1001, USA
Corresponding author: B. Lanzoni, lanzoni@bo.astro.it
Accepted: 4 November 2002
We study the contribution of projection effects to the
intrinsic thickness of the Fundamental Plane (FP) of elliptical
galaxies. The Monte–Carlo mapping technique between model properties
and observed quantities, introduced by Bertin et al. (2002), is extended to oblate, two–integrals galaxy models, with
non–homologous density profiles, adjustable flattening, variable
amount of ordered rotational support, and for which all the relevant
projected dynamical quantities can be expressed in fully analytical
way. In agreement with previous works, it is found that projection
effects move models not exactly parallel to the edge–on FP, by an
amount that can be as large as the observed FP thickness. The
statistical contribution of projection effects to the FP thickness is
however marginal, and the estimated physical FP rms thickness is
90% of the observed one (when corrected for measurement
errors).
Key words: galaxies: elliptical and lenticular, cD / galaxies: fundamental parameters / galaxies: kinematics and dynamics / galaxies: photometry
© ESO, 2003
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