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标题：Gravitational torques imply molecular gas inflow towards the nucleus of M 51
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作者：M. Querejeta ; M. Querejeta ; S. E. Meidt 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2016
卷号：588
页码：1-19
DOI：10.1051/0004-6361/201527536
语种：English
出版社：EDP Sciences
摘要：The transport of gas towards the centre of galaxies is critical for black hole feeding and, indirectly, it can control active galactic nucleus (AGN) feedback. We have quantified the molecular gas inflow in the central R< 1 kpc of M 51 to be 1 M⊙/yr, using a new gravitational torque map and the molecular gas traced by the Plateau de Bure Interferometer Arcsecond Whirlpool Survey (PAWS). The nuclear stellar bar is responsible for this gas inflow. We also used torque profiles to estimate the location of dynamical resonances, and the results suggest a corotation for the bar CRbar ~ 20′′, and a corotation for the spiral CRsp ~ 100′′. We demonstrate how important it is to correct 3.6 μm images for dust emission when gravitational torques are to be computed, and we examine further sources of uncertainty. Our observational measurement of gas inflow can be compared with nuclear molecular outflow rates and provide useful constraints for numerical simulations.
关键词：galaxies: individual: M 51;galaxies: ISM;galaxies: structure;galaxies: kinematics and dynamics;galaxies: nuclei;galaxies: Seyfert