DETECTION OF A HIGH BRIGHTNESS TEMPERATURE RADIO CORE IN THE ACTIVE-GALACTIC-NUCLEUS-DRIVEN MOLECULAR OUTFLOW CANDIDATE NGC 1266
DETECTION OF A HIGH BRIGHTNESS TEMPERATURE RADIO CORE IN THE ACTIVE-GALACTIC-NUCLEUS-DRIVEN MOLECULAR OUTFLOW CANDIDATE NGC 1266
复制标题
活动星系核驱动分子外流候选者 NGC 1266 中高亮度高温无线电核心的检测
DOI：
10.1088/0004-637x/779/2/173
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Bureau
中科院分区：
文献类型：
--
作者：
K. Nyland;K. Alatalo;J. Wrobel;L. Young;R. Morganti;T. Davis;P. T. de Zeeuw;S. Deustua;M. Bureau
我们提出了新的高空间分辨率卡尔G。Jansky甚大阵（VLA）H i吸收和甚长基线阵（VLBA）连续观测活动星系核（AGN）驱动的分子外流候选者NGC 1266。虽然其他已知的分子外流系统可能是由中心分子盘中的星星形成（SF）驱动的，但Alatalo等人报道的NGC 1266中13 M yr−1的分子质量外流速率超过了各种示踪剂的SF速率估计。这表明，一个额外的能量源，如活动星系核，可能在为外流提供动力方面发挥重要作用。我们的高空间分辨率H i吸收数据揭示了对无线电连续核心与假定的活动星系核共存的紧凑吸收，并且蓝移光谱分量的存在重新确认了气体确实流出系统。我们在1.65 GHz的VLBA观测显示，在分子气体的致密部分有一个连续谱源，直径d < 8 mas（1.2 pc），射电源Prad = 1.48 × 1020 W Hz−1，亮温Tb > 1.5 × 107 K，这与活动星系核的起源最为一致。紧凑VLBA源所暗示的射电连续能量学，以及在较低空间分辨率下的VLA连续观测档案，进一步支持了NGC 1266中活动星系核可能驱动分子外流的可能性。这些发现表明，即使是低级别的活动星系核也可能在其宿主星系中发射大量外流。
We present new high spatial resolution Karl G. Jansky Very Large Array (VLA) H i absorption and Very Long Baseline Array (VLBA) continuum observations of the active-galactic-nucleus-(AGN-)driven molecular outflow candidate NGC 1266. Although other well-known systems with molecular outflows may be driven by star formation (SF) in a central molecular disk, the molecular mass outflow rate of 13 M☉ yr−1 in NGC 1266 reported by Alatalo et al. exceeds SF rate estimates from a variety of tracers. This suggests that an additional energy source, such as an AGN, may play a significant role in powering the outflow. Our high spatial resolution H i absorption data reveal compact absorption against the radio continuum core co-located with the putative AGN, and the presence of a blueshifted spectral component re-affirms that gas is indeed flowing out of the system. Our VLBA observations at 1.65 GHz reveal one continuum source within the densest portion of the molecular gas, with a diameter d < 8 mas (1.2 pc), a radio power Prad = 1.48 × 1020 W Hz−1, and a brightness temperature Tb > 1.5 × 107 K that is most consistent with an AGN origin. The radio continuum energetics implied by the compact VLBA source, as well as archival VLA continuum observations at lower spatial resolution, further support the possibility that the AGN in NGC 1266 could be driving the molecular outflow. These findings suggest that even low-level AGNs may be able to launch massive outflows in their host galaxies.
ATLAS3D 项目 - XVI。
影响因子：
4.8
作者：
Bayet E
通讯作者：
Bayet E