%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 }