AGN feedback compared: jets versus radiation

作者：Cielo Salvatore^*; Bieri Rebekka; Volonteri Marta; Wagner Alexander Y; Dubois Yohan

来源：Monthly Notices of the Royal Astronomical Society, 2018, 477(1): 1336-1355.

DOI：10.1093/mnras/sty708

• radiative transfer
• methods: numerical
• galaxies: ISM
• galaxies: jets
• quasars: general

Feedback by active galactic nuclei (AGNs) is often divided into quasar and radio mode, powered by radiation or radio jets, respectively. Both are fundamental in galaxy evolution, especially in late-type galaxies, as shown by cosmological simulations and observations of jet-ISM (interstellar medium) interactions in these systems. We compare AGN feedback by radiation and by collimated jets through a suite of simulations, in which a central AGN interacts with a clumpy, fractal galactic disc. We test AGNs of 10(43) and 10(46) erg s 1, considering jets perpendicular or parallel to the disc. Mechanical jets drive the more powerful outflows, exhibiting stronger mass and momentum coupling with the dense gas, while radiation heats and rarefies the gas more. Radiation and perpendicular jets evolve to be quite similar in outflow properties and effect on the cold ISM, while inclined jets interact more efficiently with all the disc gas, removing the densest 20 per cent in 20 Myr, and thereby reducing the amount of cold gas available for star formation. All simulations show small-scale inflows of 0.01-0.1 M-circle dot yr(-1), which can easily reach down to the Bondi radius of the central supermassive black hole (especially for radiation and perpendicular jets), implying that AGNs modulate their own duty cycle in a feedback/feeding cycle.

• 出版日期2018-6