Active galactic nuclei-driven outflows without immediate quenching in simulations of high-redshift disc galaxies

被引:114
作者
Gabor, J. M. [1 ]
Bournaud, Frederic [1 ]
机构
[1] CEA Saclay, IRFU, SAp, F-91191 Gif Sur Yvette, France
关键词
galaxies: active; galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: nuclei; SUPERMASSIVE BLACK-HOLES; SIMILAR-TO; 2; STAR-FORMING GALAXIES; SELF-REGULATED GROWTH; SINS/ZC-SINF SURVEY; COSMOLOGICAL SIMULATIONS; INTERSTELLAR-MEDIUM; QUASAR FEEDBACK; COOLING FLOWS; HOST GALAXIES;
D O I
10.1093/mnras/stu677
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study outflows driven by active galactic nuclei (AGNs) using high-resolution simulations of idealized z similar to 2 isolated disc galaxies. Episodic accretion events lead to outflows with velocities > 1000 km s(-1) and mass outflow rates of about the star formation rate (several tens of M-aS (TM) yr(-1)). Outflowing winds escape perpendicular to the disc with wide opening angles, and are typically asymmetric (i.e. unipolar) because dense gas above or below the AGN in the resolved disc inhibits outflow. Owing to rapid variability in the accretion rates, outflowing gas may be detectable even when the AGN is effectively 'off'. The highest velocity outflows are sometimes, but not always, concentrated within 2-3 kpc of the galactic centre during the peak accretion. With our purely thermal AGN feedback model - standard in previous literature - the outflowing material is mostly hot (a parts per thousand(3)10(6) K) and diffuse (n(H) a parts per thousand(2) 10(- 2) cm(-3)), but includes a cold component entrained in the hot wind. Despite the powerful bursts and high outflow rates, AGN feedback has little effect on the dense gas in the galaxy disc. Thus AGN-driven outflows in our simulations do not cause rapid quenching of star formation, although they may remove significant amounts of gas over long (a parts per thousand(3)Gyr) time-scales.
引用
收藏
页码:1615 / 1627
页数:13
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