Self-Regulated AGN Heating in Elliptical Galaxies

Details Self-Regulated AGN Heating in Elliptical Galaxies Self-Regulated AGN Heating in Elliptical Galaxies

2004-09-03

arxiv.org/abs/astro-ph/0409068v2

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, accepted for publication in MNRAS Letters

Scientific paper

10.1111/j.1745-3933.2005.00018.x

We study the effect of active galactic nuclei (AGN) heating on the chemodynamical evolution of elliptical galaxies and their X-ray and optical properties using high-resolution Lambda-dominated cold dark matter cosmological simulations. Our model considers an AGN as being ``active'' when a convergent gas inflow condition exists within a galaxy's nucleus; otherwise, the AGN is assumed to remain dormant. This induces a self-regulated activity for the AGN, the result of which leads to a stable hot corona and the suppression of significant late-time star formation - characteristics not encountered in traditional chemodynamical models of ellipticals. These properties of our AGN heating model leads to a system consistent with both the X-ray and optical properties of comparable elliptical galaxies.

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