Abstract
Feedback from outflows driven by active galactic nuclei (AGN) can affect the
distribution and properties of the gaseous halos of galaxies. We study the
hydrodynamics and non-thermal emission from the forward outflow shock produced
by an AGN-driven outflow. We consider a few possible profiles for the halo gas
density, self-consistently constrained by the halo mass, redshift and the disk
baryonic concentration of the galaxy. We show that the outflow velocity levels
off at $10^3\,km\, s^-1$ within the scale of the galaxy disk.
Typically, the outflow can reach the virial radius around the time when the AGN
shuts off. We show that the outflows are energy-driven, consistently with
observations. The outflow shock lights up the halos of massive galaxies across
a broad wavelength range. For Milky Way (MW) mass halos, radio observations by
The Jansky Very Large Array (JVLA) and The Square Kilometer Array (SKA) and
infrared/optical observations by The James Webb Space Telescope (JWST) and
Hubble Space Telescope (HST) can detect the emission signal of angular size
$8"$ from galaxies out to redshift $z\sim5$. Millimeter observations by
The Atacama Large Millimeter/submillimeter Array (ALMA) are sensitive to
non-thermal emission of angular size $18"$ from galaxies at redshift
$złesssim1$, while X-ray observations by Chandra, XMM-Newton and The Advanced
Telescope for High Energy Astrophysics (ATHENA) is limited to local galaxies
($z0.1$) with an emission angular size of $\sim2'$. Overall, the
extended non-thermal emission provides a new way of probing the gaseous halos
of galaxies at high redshifts.
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