Tidal energy effects of dark matter halos on early-type galaxies

TL;DR

This paper explores how tidal interactions between dark matter halos and luminous matter in early-type galaxies might explain the tilt of the Fundamental Plane, using analytical models based on the tensor virial theorem.

Contribution

It introduces an analytical approach to assess the impact of dark matter tidal effects on galaxy structure, offering a potential explanation for the FP tilt.

Findings

Potential energy profiles show maxima and minima indicating preferred virialized scales.

Maxima in potential energy profiles alone cannot fully explain the FP tilt.

Additional relations are needed beyond tidal effects to account for the FP tilt.

Abstract

Tidal interactions between neighboring objects span across the whole admissible range of lengths in nature: from, say, atoms to clusters of galaxies i.e. from micro to macrocosms. According to current cosmological theories, galaxies are embedded within massive non-baryonic dark matter (DM) halos, which affects their formation and evolution. It is therefore highly rewarding to understand the role of tidal interaction between the dark and luminous matter in galaxies. The current investigation is devoted to Early-Type Galaxies (ETGs), looking in particular at the possibility of establishing whether the tidal interaction of the DM halo with the luminous baryonic component may be at the origin of the so-called "tilt" of the Fundamental Plane (FP). The extension of the tensor virial theorem to two-component matter distributions implies the calculation of the self potential energy due to a selected subsystem, and the tidal potential energy induced by the other one. The additional assumption of homeoidally striated density profiles allows analytical expressions of the results for some cases of astrophysical interest. The current investigation raises from the fact that the profile of the (self + tidal) potential energy of the inner component shows maxima and minima, suggesting the possible existence of preferential scales for the virialized structure, i.e. a viable explanation of the so called "tilt" of the FP. It is found that configurations related to the maxima do not suffice, by themselves, to interpret the FP tilt, and some other relation has to be looked for.