Feedback from active galactic nuclei: energy- versus momentum-driving

被引:162
作者
Costa, Tiago [1 ]
Sijacki, Debora
Haehnelt, Martin G.
机构
[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
关键词
black hole physics; methods: numerical; cosmology: theory; SUPERMASSIVE BLACK-HOLES; ULTRA-FAST OUTFLOWS; BRIGHTEST CLUSTER GALAXIES; MASSIVE MOLECULAR OUTFLOWS; SHELL ABSORPTION-LINES; RADIO-QUIET AGNS; SIMILAR-TO; M-BH-SIGMA; COSMOLOGICAL SIMULATIONS; QUASAR FEEDBACK;
D O I
10.1093/mnras/stu1632
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We employ hydrodynamical simulations using the moving-mesh code AREPO to investigate the role of energy and momentum input from active galactic nuclei (AGN) in driving large-scale galactic outflows. We start by reproducing analytic solutions for both energy-and momentum-driven outflowing shells in simulations of a spherical isolated dark matter potential with gas in hydrostatic equilibrium and with no radiative cooling. We confirm that for this simplified setup, galactic outflows driven by a momentum input rate of order L-Edd/c can establish an M-BH-sigma relation with slope and normalization similar to that observed. We show that momentum input at a rate of L-Edd/c is however insufficient to drive efficient outflows once cooling and gas inflows as predicted by cosmological simulations at resolved scales are taken into account. We argue that observed large-scaleAGN-driven outflows are instead likely to be energy-driven and show that such outflows can reach momentum fluxes exceeding 10L(Edd)/c within the innermost 10 kpc of the galaxy. The outflows are highly anisotropic, with outflow rates and a velocity structure found to be inadequately described by spherical outflow models. We verify that the hot energy-driven outflowing gas is expected to be strongly affected by metal-line cooling, leading to significant amounts (greater than or similar to 10(9)M(circle dot)) of entrained cold gas.
引用
收藏
页码:2355 / 2376
页数:22
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