Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 455, Issue 4, Pages 4166-4182Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv2551
Keywords
methods; numerical - galaxies; active - galaxies; formation
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Funding
- UPMC - Sorbonne Universites
- National Science Foundation [OIA-1124403]
- Templeton Foundation
- Balzan foundation
- Institute Lagrange de Paris
- French ANR [ANR-13-BS05-0005]
- Agence Nationale de la Recherche (ANR) [ANR-13-BS05-0005] Funding Source: Agence Nationale de la Recherche (ANR)
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Feedback from active galactic nuclei (AGN) has often been invoked both in simulations and in interpreting observations for regulating star formation and quenching cooling flows in massive galaxies. AGN activity can, however, also overpressurize the dense star-forming regions of galaxies and thus enhance star formation, leading to a positive feedback effect. To understand this pressurization better, we investigate the effect of an ambient external pressure on gas fragmentation and triggering of starburst activity by means of hydrodynamical simulations. We find that moderate levels of overpressurization of the galaxy boost the global star formation rate of the galaxy by an order of magnitude, turn stable discs unstable, and lead to significant fragmentation of the gas content of the galaxy, similar to what is observed in high-redshift galaxies.
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