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arXiv 1909.00675astro-ph.GA
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ALMA对NGC1068圆环及其周围的多个面进行成像

ALMA images the many faces of the NGC1068 torus and its surroundings

S. Garcia-Burillo, F. Combes, C. Ramos Almeida, A. Usero, A. Alonso-Herrero, L. K. Hunt, D. Rouan, S. Aalto, M. Querejeta, S. Viti, P. P. van der Werf, H. Vives… 展开作者

S. Garcia-Burillo, F. Combes, C. Ramos Almeida, A. Usero, A. Alonso-Herrero, L. K. Hunt, D. Rouan, S. Aalto, M. Querejeta, S. Viti, P. P. van der Werf, H. Vives-Arias, A. Fuente, L. Colina, J. Martin-Pintado, C. Henkel, S. Martin, M. Krips, D. Gratadour, R. Neri, L. J. Tacconi

摘要:

本文通过研究Seyfert 2星系NGC 1068中分子气体的分布和运动学,以及环内的连接,研究了星系核活动的补给和反馈。利用ALMA对环核盘(CND)和环面中的CO(2-1)、CO(3-2)和HCO+(4-3)谱线进行了成像,空间分辨率为~0.03”-0.09”(2-6pc)。ALMA将CND解析为一个直径约为400 pc、质量约为1.4x10^8 Msun的不对称环状盘。环的内边缘与近红外偏振辐射的边缘增亮弧有关,这些弧与活动星系核电离风的工作表面有关。ALMA证明了一个分子环面的存在,其大小为3 × 10^5Msun,它围绕着中心发动机在D=10- 30 pc的大范围内延伸。新的观测结果证明了环面的密度径向分层:HCO+(4-3)环面,全尺寸D= 11 pc,比CO(2-1)和CO(3-2)环面小2-3倍,后者分别为全尺寸D= 26 pc和D= 28 pc。圆环通过气体拖缆网络连接到CND。分子气体的运动学表现出强烈的偏离圆环,气体流光,和CND的圆周运动。这些速度扭曲是相互关联的,是三维外流的一部分,反映了AGN反馈对分子气体运动学的影响,在很大的空间尺度。我们的结论是,从吸积盘发射的广角活动星系核风正在影响环内相当大一部分的气体(~0.4-0.6 x M_torus)。然而,靠近环赤道面的一个大型气体库(约1.2-1.8 × 10^5百万太阳)仍然不受活动星系核风的影响,可以继续为活动星系核提供约1- 400万年的燃料。然而,活动星系核的燃料供给似乎在中等尺度上(15 pc < r <50 pc)受到了阻碍。

英文摘要:

We investigate the fueling and the feedback of nuclear activity in the Seyfert 2 galaxy NGC1068, by studying the distribution and kinematics of molecular gas in the torus and its connections. We use ALMA to image the emission of a set of molecular gas tracers in the circumnuclear disk (CND) and the torus of the galaxy using the CO(2-1), CO(3-2) and HCO+(4-3) lines with spatial resolutions ~0.03"-0.09"(2-6pc). ALMA resolves the CND as an asymmetric ringed disk of D~400pc-size and mass of ~1.4x10^8 Msun. The inner edge of the ring is associated with edge-brightened arcs of NIR polarized emission identified with the working surface of the AGN ionized wind. ALMA proves the existence of a molecular torus of M_torus ~ 3x10^5Msun, which extends over a large range of spatial scales D=10-30pc around the central engine. The new observations evidence the density radial stratification of the torus: the HCO+(4-3) torus, with a full size D=11pc, is a factor of 2-3 smaller than its CO(2-1) and CO(3-2) counterparts, which have full-sizes D=26pc and D=28pc, respectively. The torus is connected to the CND through a network of gas streamers. The kinematics of molecular gas show strong departures from circular motions in the torus, the gas streamers, and the CND. These velocity distortions are interconnected and are part of a 3D outflow that reflects the effects of AGN feedback on the kinematics of molecular gas across a wide range of spatial scales. We conclude that a wide-angle AGN wind launched from the accretion disk is impacting a sizeable fraction of the gas inside the torus (~0.4-0.6 x M_torus). However, a large gas reservoir (~1.2-1.8 x 10^5Msun) close to the equatorial plane of the torus remains unaffected by the AGN wind and can continue fueling the AGN for ~1-4Myr. AGN fueling seems nevertheless thwarted on intermediate scales (15pc < r < 50pc).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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