The Centimeter to Submillimeter Broad Band Radio Spectrum of the Central Compact Component in A Nearby Type-II Seyfert Galaxy NGC 1068
The Centimeter to Submillimeter Broad Band Radio Spectrum of the Central Compact Component in A Nearby Type-II Seyfert Galaxy NGC 1068
复制标题
附近 II 型塞弗特星系 NGC 1068 中央紧凑组件的厘米至亚毫米宽带无线电频谱
DOI：
10.1093/pasj/psad044
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
A. Doi
中科院分区：
文献类型：
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作者：
T. Michiyama;Y. Inoue;A. Doi
我们分析了邻近的ii型塞弗特星系NGC 1068的所有可用的阿塔卡马大毫米/亚毫米阵列档案数据，包括新的100 GHz数据，角分辨率为0 \farcs 05，这是以前连续光谱分析中没有包括的。结合基于甚大阵列的文献数据，研究了NGC 1068中心$\lesssim7$ pc区的宽带射电连续谱。我们发现在5-700 GHz时，磁通密度在$\approx$ 10-20 mJy之间。由于先前研究中的模型无法考虑新增加的100 GHz数据点，我们继续更新模型并对参数进行必要的调整。对这种宽带无线电频谱的一种可能的解释是，喷射基地、尘埃环面和致密的x射线日冕的发射结合在一起，其磁场强度为$\approx20$ G（以$\approx30$史瓦西半径为尺度）。为了通过忽略任何其他可能的扩展成分（例如，周围电离气体的自由-自由发射）来确定紧凑的日冕，需要通过下一代干涉仪实现高分辨率/灵敏度的观测。
We analyze all the available Atacama Large Millimeter / submillimeter Array archival data of the nearby Type-II Seyfert galaxy NGC 1068, including new 100 GHz data with the angular resolution of 0\farcs05, which was not included in previous continuum spectral analysis. By combining with the literature data based on the Very Large Array, we investigate the broadband radio continuum spectrum of the central $\lesssim7$ pc region of NGC 1068. We found that the flux density is between $\approx$10-20 mJy at 5-700 GHz. Due to the inability of the model in previous studies to account for the newly added 100 GHz data point, we proceeded to update the models and make the necessary adjustments to the parameters. One possible interpretation of this broadband radio spectrum is a combination of emission from the jet base, the dusty torus, and the compact X-raying corona with the magnetic field strength of $\approx20$ G on scales of $\approx30$ Schwarzschild radii from the central black hole. In order to firmly identify the compact corona by omitting any other possible extended components (e.g., free-free emission from ionized gas around), high-resolution/sensitivity observations achieved by next-generation interferometers will be necessary.