Unravelling the physics of multiphase AGN winds through emission line tracers
Unravelling the physics of multiphase AGN winds through emission line tracers
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通过发射线示踪剂揭示多相 AGN 风的物理原理
DOI:
10.1093/mnras/stab556
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发表时间:
2021
影响因子:
4.8
通讯作者:
Stern, Jonathan
中科院分区:
文献类型:
--
作者:
Richings, Alexander J;Faucher-Giguère, Claude-André;Stern, Jonathan
Observations of emission lines in active galactic nuclei (AGNs) often find fast (∼1000 km s−1) outflows extending to kiloparsec scales, seen in ionized, neutral atomic and molecular gas. In this work we present radiative transfer calculations of emission lines in hydrodynamic simulations of AGN outflows driven by a hot wind bubble, including non-equilibrium chemistry, to explore how these lines trace the physical properties of the multiphase outflow. We find that the hot bubble compresses the line-emitting gas, resulting in higher pressures than in the ambient interstellar medium or that would be produced by the AGN radiation pressure. This implies that observed emission line ratios such as [Oiv]/ [Neii], [Nev]/ [Neii], and [Niii]/ [Nii]constrain the presence of the bubble and hence the outflow driving mechanism. However, the line-emitting gas is under-pressurized compared to the hot bubble itself, and much of the line emission arises from gas that is out of pressure, thermal and/or chemical equilibrium. Our results thus suggest that assuming equilibrium conditions, as commonly done in AGN line emission models, is not justified if a hot wind bubble is present. We also find that ≳50 per cent of the mass outflow rate, momentum flux, and kinetic energy flux of the outflow are traced by lines such as [Nii]and [Neiii](produced in the 10phase) and [Cii](produced in the transition from 10to 100 K).
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DOI:
10.1086/175633
发表时间:
1994-12
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Boqi Wang
通讯作者:
Boqi Wang
DOI:
10.3847/2041-8213/ab1262
发表时间:
2019-03
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
D. Rosario;A. Togi;L. Burtscher;R. Davies;T. Shimizu;D. Lutz
通讯作者:
D. Rosario;A. Togi;L. Burtscher;R. Davies;T. Shimizu;D. Lutz
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
A. J. Richings;J. Schaye;B. Oppenheimer
通讯作者:
B. Oppenheimer
影响因子:
4.9
作者:
A. Janssen;N. Christopher;E. Sturm;S. Veilleux;A. Contursi;E. Gonz'alez;J. Fischer;R. Davies;A. Verma;J. Graciá;R. Genzel;D. Lutz;A. Sternberg;L. Tacconi;L. Burtscher;A. Poglitsch
通讯作者:
A. Poglitsch
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
A. J. Richings;J. Schaye;B. Oppenheimer
通讯作者:
B. Oppenheimer