External pressure-triggering of star formation in a disc galaxy: a template for positive feedback

被引：55

作者：

Bieri, Rebekka ^{[1
,2
]}

Dubois, Yohan ^{[1
,2
]}

Silk, Joseph ^{[1
,2
,3
,4
,5
]}

Mamon, Gary A. ^{[1
,2
]}

Gaibler, Volker ^{[6
]}

机构：

[1] Univ Paris 04, Inst Astrophys Paris, UMR 7095, CNRS, F-75014 Paris, France

[2] Univ Paris 04, UPMC, F-75014 Paris, France

[3] Univ Paris 07, CNRS, CEA DSM IRFU, Lab AIM Paris Saclay, F-91191 Gif Sur Yvette, France

[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[5] Univ Oxford, Dept Phys, BIPAC, Oxford OX1 3RH, England

[6] Heidelberg Univ, Inst Theoret Astrophys, D-69120 Heidelberg, Germany

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 455卷 / 04期

基金：

美国国家科学基金会;

关键词：

methods; numerical; -; galaxies; active; formation; ACTIVE GALACTIC NUCLEI; SUPERMASSIVE BLACK-HOLES; JET-INDUCED FEEDBACK; COSMOLOGICAL SIMULATIONS; MOLECULAR CLOUDS; RADIO-SOURCES; HIGH-REDSHIFT; INTERSTELLAR-MEDIUM; MINKOWSKIS OBJECT; FORMATION RATES;

D O I：

10.1093/mnras/stv2551

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：4166 / 4182

页数：17

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