Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-08
Astrophys.J. 579 (2002) 261-269
Astronomy and Astrophysics
Astrophysics
28 pages, 6 figures, accepted for publication on ApJ
Scientific paper
10.1086/342707
We analyse the structural and dynamical properties of a sample of 324 nearby elliptical and dwarf elliptical galaxies observed during an extensive NIR survey in H-band (1.65 micron). The Fundamental Plane (FP) is determined and a significant tilt is assessed. The origins of such a tilt are investigated by means of a spherically symmetric, isotropic pressure supported dynamical model relying on the observed surface brightness profiles. The systematic variation of the shape coefficient converting the measured central velocity dispersion $ sigma_0$ into the virial rms velocity $ sigma_{rms}$ is found to be the main cause of the tilt, due to aperture effects. Moreover the ratio between the dynamical mass $M_{dyn}$ and the total H-band luminosity $L_H$ turns out to be roughly constant along the luminosity sequence of ellipticals: H-band luminosity is therefore a reliable and cheap estimator of the dynamical mass of the Es.
Boselli Alessandro
Franzetti Paolo
Gavazzi Giuseppe
Scodeggio Marco
Zibetti Stefano
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