Fakultäten » Mathematisch-naturwissenschaftliche Fakultät » Physik-Institut » Prof. Dr. Philippe Jetzer » Tortora

Completed research project

Title / Titel The Modi ed Newtonian Dynamics (MOND) Fundamental Plane (2010)
PDF Abstract (PDF, 14 KB)
Summary / Zusammenfassung Modi ed Newtonian Dynamics (MOND) has been shown to be able to t spiral galaxy rotation curves as well as giving a theoretical foundation for empirically determined scaling relations, such as the Tully-Fisher law, without the need for a dark matter halo. Motivated by these results, we investigated whether MOND can also reproduce the dynamics of early - type galaxies (ETGs) without dark matter. To this end, we rst derived a general expression for the aperture velocity dispersion and showed that MOND predicts a loglinear relation among the e ective radius Reff , the velocity dispersion 0 and the mean e ective intensity hIei, which we refer to as the MOND Fundamental Plane (MFP). In order to check the viability of our derivation, we tted the observed 0 of a large sample of ETGs for various combinations of velocity anisotropy pro les and MOND interpolating functions showing that MOND is also able to t the data of ETGs without dark matter. This test also enables us to estimate the quantities needed to nally predict the MFP coecients to be compared with those of the observed Fundamental Plane. The theoretical MFP turns out to be tilted with respect to both the Newtonian virial one and the observed Fundamental Plane. The paper is accepted in MNRAS [17].
Project leadership and contacts /
Projektleitung und Kontakte
Dr Crescenzo Tortora (Project Leader)  
Funding source(s) /
Unterstützt durch
Universität Zürich (position pursuing an academic career), SNF (Personen- und Projektförderung)
Duration of Project / Projektdauer Jan 2010 to Dec 2010