Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Feedback from Active Galactic Nuclei: Energy- versus momentum-driving   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 normalisation
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-scale AGN-driven outflows are instead
likely to be energy-driven and show that such outflows can reach momentum
fluxes exceeding 10 L_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 (>10^9 M_sun) of entrained
cold gas.

26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
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The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs