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arXiv 1510.03440astro-ph.GA
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引力矩意味着分子气体向M51核流入

Gravitational torques imply molecular gas inflow towards the nucleus of M51

M. Querejeta, S. Meidt, E. Schinnerer, S. García-Burillo, C. Dobbs, D. Colombo, G. Dumas, A. Hughes, C. Kramer, A. Leroy, J. Pety, K. Schuster, T. Thompson

摘要:

气体向星系中心的输送对黑洞的进食至关重要,并间接地控制活动星系核(AGN)的反馈。利用新的引力矩图和PdBI弧秒漩涡巡天(PAWS)追踪的分子气体,我们将M51中心R<1 kpc的分子气体流入量定量为1 Msun/yr。恒星核棒是造成这种气体流入的原因。我们还使用扭矩分布来估计动态共振的位置,建议在R~20”处杆的共转,以及在R~100”处螺旋的共转。我们证明了它是多么重要,以计算重力力矩,以纠正3.6微米的图像尘埃排放,我们仔细检查进一步的不确定性来源。我们的气体流入的观测测量可以与核分子流出速率进行比较,并为数值模拟提供有用的约束。

英文摘要:

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<1kpc of M51 to be 1 Msun/yr, using a new gravitational torque map and the molecular gas traced by the PdBI Arcsecond Whirlpool Survey (PAWS). The nuclear stellar bar is responsible for this gas inflow. We have also used torque profiles to estimate the location of dynamical resonances, suggesting a corotation for the bar at R~20", and a corotation for the spiral at R~100". We demonstrate how important it is to correct 3.6um images for dust emission in order to compute gravitational torques, and we carefully 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.

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