Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 431, Issue 1, Pages 793-798Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt214
Keywords
accretion, accretion discs; galaxies: evolution; quasars: general
Categories
Funding
- STFC
- Large Facilities Capital Fund of BIS
- STFC [PP/E00119X/1, ST/K001000/1, ST/H00856X/1, ST/H002235/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K001000/1, PP/E00119X/1, ST/H002235/1, ST/H00856X/1] Funding Source: researchfish
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Quasar feedback outflows are commonly invoked to drive gas out of galaxies in the early gas-rich epoch to terminate growth of galaxies. Here we present simulations that show that AGN feedback may drive not only gas but also stars out of their host galaxies under certain conditions. The mechanics of this process is as follows: (1) AGN-driven outflows accelerate and compress gas filling the host galaxy; (2) the accelerated dense shells become gravitationally unstable and form stars on radial trajectories. For the spherically symmetric initial conditions explored here, the black hole needs to exceed the host's M-sigma mass by a factor of a few to accelerate the shells and the new stars to escape velocities. We discuss potential implications of these effects for the host galaxies: (i) radial mixing of bulge stars with the rest of the host; (ii) contribution of quasar outflows to galactic fountains as sources of high-velocity clouds; (iii) wholesale ejection of hypervelocity stars out of their hosts, giving rise to Type II supernovae on galactic outskirts, and contributing to reionization and metal enrichment of the Universe; (iv) bulge erosion and even complete destruction in extreme cases resulting in overweight or bulgeless SMBHs.
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