The accurate mass distribution of M87, the Giant Galaxy with imaged shadow of its supermassive black hole, as a portal to new Physics

TL;DR

This paper combines precise measurements of M87's black hole and galaxy mass distribution to explore dark matter properties and their role in galaxy evolution, suggesting dark matter influences black hole growth.

Contribution

It provides the first detailed dark/luminous mass decomposition of M87 from the center to the virial radius, linking black hole growth to dark matter.

Findings

Detection of a large dark matter halo core in M87.

Evidence that dark matter contributes to supermassive black hole growth.

Constraints on dark halo particle nature based on galaxy mass distribution.

Abstract

The very careful Event Horizon Telescope estimate of the mass of the supermassive black hole at the center of the Giant CD galaxy M87, allied with recent high quality photometric and spectroscopic measurements, yields a proper dark/luminous mass decomposition from the galaxy center to its virial radius. That provides us with decisive information on crucial cosmological and astrophysical issues. The dark and the standard matter distributions in a wide first time detected galaxy region under the supermassive black hole gravitational control. The well known supermassive black hole mass vs stellar dispersion velocity relationship at the highest galaxy masses implies an exotic growth of the former. This may be the first case in which one can argue that the supermassive black hole mass growth was also contributed by the Dark Matter component. A huge dark matter halo core in a galaxy with inefficient baryonic feedback is present and consequently constrains the nature of the dark halo particles. The unexplained entanglement between dark/luminous structural properties, already emerged in disk systems, also appears.