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1.65 micron H-band Surface Photometry of Galaxies. X: Structural and Dynamical Properties of Elliptical Galaxies

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arxiv astro-ph/0207169 v1 pith:6VUM4WSS submitted 2002-07-08 astro-ph

S.Zibetti (MPA Garching) , G.Gavazzi (Universita' di Milano Bicocca) , M.Scodeggio (IASF-CNR Milano) , P.Franzetti (IASF-CNR Milano) , A.Boselli (Laboratoires d'Astrophysique Marseille) This is my paper · ORCID
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keywords dynamicalh-bandellipticalgalaxiesluminositytiltmassmicron
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abstract

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.

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  1. Filling the Shadow: A Propositional Model of Gravastar Accretion in $f(R, L_m, T)$ Gravity

    gr-qc 2026-08 reject novelty 4.0 of 10

    A propositional model predicts that the coupling parameter of f(R, L_m, T) gravity shifts the inner edge of a gravastar accretion disk and that surface emission could fill in the central shadow.

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