We employ hydrodynamical simulations to study the effect of AGN mechanical
and radiation feedback on the formation of bulge dominated galaxies via mergers
of disk galaxies. The merging galaxies have mass-ratios of 1:1 to 6:1 and
include pre-existing hot gaseous halos to properly account for the global
impact of AGN feedback. We compare three models: (1) no black hole and no AGN
feedback; (2) thermal AGN feedback; and (3) mechanical and radiative AGN
feedback. The last model is motivated by observations of broad absorption line
quasars which show winds with initial velocities of v_w ~ 10,000 km/s and also
heating associated with the central AGN X-ray radiation. The primary changes in
gas properties due to mechanical AGN feedback are lower thermal X-ray
luminosity from the final galaxy - in better agreement with observations - and
galactic outflows with higher velocity ~ 1000 km/s similar to recent direct
observations of nearby merger remnants. The kinetic energy of the outflowing
gas is a factor of ~ 20 higher than in the thermal feedback case. All merger
remnants with momentum-based AGN feedback, independent of their progenitor
mass-ratios, follow the observed relations between stellar velocity dispersion
and black hole mass (M_BH-\sigma) as well as X-ray luminosity (L_X-\sigma) with
10^37.5 < L_X (0.3-8 keV) < 10^39.2 for velocity dispersions in the range of
120 km/s < < 190 km/s. In addition, the mechanical feedback produces a
much greater AGN variability. We also show that gas is more rapidly and
impulsively stripped from the galactic centres driving a moderate increase in
galaxy size and decrease in central density with the mechanical AGN feedback
model. However, the black hole mass growth required to produce the observed
galaxy size and central density evolution is inconsistent with the observed
M_BH-\sigma relation.
Description
[1308.3719] Consequences of Radiative and Mechanical Feedback from Black Holes in Galaxy Mergers
%0 Generic
%1 choi2013consequences
%A Choi, Ena
%A Naab, Thorsten
%A Ostriker, Jeremiah P.
%A Johansson, Peter H.
%A Moster, Benjamin P.
%D 2013
%K agn feedback galaxy momentum
%T Consequences of Radiative and Mechanical Feedback from Black Holes in
Galaxy Mergers
%U http://arxiv.org/abs/1308.3719
%X We employ hydrodynamical simulations to study the effect of AGN mechanical
and radiation feedback on the formation of bulge dominated galaxies via mergers
of disk galaxies. The merging galaxies have mass-ratios of 1:1 to 6:1 and
include pre-existing hot gaseous halos to properly account for the global
impact of AGN feedback. We compare three models: (1) no black hole and no AGN
feedback; (2) thermal AGN feedback; and (3) mechanical and radiative AGN
feedback. The last model is motivated by observations of broad absorption line
quasars which show winds with initial velocities of v_w ~ 10,000 km/s and also
heating associated with the central AGN X-ray radiation. The primary changes in
gas properties due to mechanical AGN feedback are lower thermal X-ray
luminosity from the final galaxy - in better agreement with observations - and
galactic outflows with higher velocity ~ 1000 km/s similar to recent direct
observations of nearby merger remnants. The kinetic energy of the outflowing
gas is a factor of ~ 20 higher than in the thermal feedback case. All merger
remnants with momentum-based AGN feedback, independent of their progenitor
mass-ratios, follow the observed relations between stellar velocity dispersion
and black hole mass (M_BH-\sigma) as well as X-ray luminosity (L_X-\sigma) with
10^37.5 < L_X (0.3-8 keV) < 10^39.2 for velocity dispersions in the range of
120 km/s < < 190 km/s. In addition, the mechanical feedback produces a
much greater AGN variability. We also show that gas is more rapidly and
impulsively stripped from the galactic centres driving a moderate increase in
galaxy size and decrease in central density with the mechanical AGN feedback
model. However, the black hole mass growth required to produce the observed
galaxy size and central density evolution is inconsistent with the observed
M_BH-\sigma relation.
@misc{choi2013consequences,
abstract = {We employ hydrodynamical simulations to study the effect of AGN mechanical
and radiation feedback on the formation of bulge dominated galaxies via mergers
of disk galaxies. The merging galaxies have mass-ratios of 1:1 to 6:1 and
include pre-existing hot gaseous halos to properly account for the global
impact of AGN feedback. We compare three models: (1) no black hole and no AGN
feedback; (2) thermal AGN feedback; and (3) mechanical and radiative AGN
feedback. The last model is motivated by observations of broad absorption line
quasars which show winds with initial velocities of v_w ~ 10,000 km/s and also
heating associated with the central AGN X-ray radiation. The primary changes in
gas properties due to mechanical AGN feedback are lower thermal X-ray
luminosity from the final galaxy - in better agreement with observations - and
galactic outflows with higher velocity ~ 1000 km/s similar to recent direct
observations of nearby merger remnants. The kinetic energy of the outflowing
gas is a factor of ~ 20 higher than in the thermal feedback case. All merger
remnants with momentum-based AGN feedback, independent of their progenitor
mass-ratios, follow the observed relations between stellar velocity dispersion
and black hole mass (M_BH-\sigma) as well as X-ray luminosity (L_X-\sigma) with
10^37.5 < L_X (0.3-8 keV) < 10^39.2 for velocity dispersions in the range of
120 km/s < \sigma < 190 km/s. In addition, the mechanical feedback produces a
much greater AGN variability. We also show that gas is more rapidly and
impulsively stripped from the galactic centres driving a moderate increase in
galaxy size and decrease in central density with the mechanical AGN feedback
model. However, the black hole mass growth required to produce the observed
galaxy size and central density evolution is inconsistent with the observed
M_BH-{\sigma} relation.},
added-at = {2013-08-20T06:38:50.000+0200},
author = {Choi, Ena and Naab, Thorsten and Ostriker, Jeremiah P. and Johansson, Peter H. and Moster, Benjamin P.},
biburl = {https://www.bibsonomy.org/bibtex/2b6d8a2943b59f75f7267caafda0a0ed7/miki},
description = {[1308.3719] Consequences of Radiative and Mechanical Feedback from Black Holes in Galaxy Mergers},
interhash = {1072f21a59980a0c7d6430d130e4da3a},
intrahash = {b6d8a2943b59f75f7267caafda0a0ed7},
keywords = {agn feedback galaxy momentum},
note = {cite arxiv:1308.3719Comment: 15 pages, 10 figures, submitted to MNRAS},
timestamp = {2013-08-20T06:38:50.000+0200},
title = {Consequences of Radiative and Mechanical Feedback from Black Holes in
Galaxy Mergers},
url = {http://arxiv.org/abs/1308.3719},
year = 2013
}