Submillimeter Array 12CO (J = 3-2) Interferometric Observations of the Central Region of M51
Submillimeter Array 12CO (J = 3-2) Interferometric Observations of the Central Region of M51
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M51 中心区域亚毫米阵列 12CO (J = 3-2) 干涉观测
DOI：
10.1086/424798
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Jeremy Lim
中科院分区：
文献类型：
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作者：
S. Matsushita;K. Sakamoto;C. Kuo;P. Hsieh;Dinh;R. Mao;D. Iono;A. Peck;M. Wiedner;Sheng;N. Ohashi;Jeremy Lim
我们首次使用亚毫米阵列 (SMA) 对 Seyfert 2 星系 M51 的中心进行 12CO (J = 3-2) 干涉观测（光束尺寸为 3.″9 × 1.″6 或 160 × 65 pc）。图像显示核心处有强烈的集中，而旋臂向西北方向的发射较弱。 12CO (J = 3-2) 中中心成分的积分强度几乎是 12CO (J = 1-0) 中的两倍，表明原子核 ~80 pc 半径内的分子气体是温暖的 (≳100 K) 和致密的 (~104 cm-3)。在我们银河系的震动区域中也看到了类似的强度比，这表明这些气体特性可能与活跃的星系核或星暴活动有关。中心部分显示出垂直于射电连续射流的线速度梯度（~1.4 km s-1 pc-1），与之前的观测结果相似，并被解释为 Seyfert 2 核周围的核周分子盘/圆环。此外，我们还确定了沿射流的线速度梯度（0.7 km s-1 pc-1）。从能量学上看，速度梯度可以用超新星爆炸或通过相互作用从射流到分子气体的能量和动量传递来解释，这与高强度比是一致的。
We present the first interferometric 12CO (J = 3-2) observations (beam size of 3.″9 × 1.″6 or 160 × 65 pc) with the Submillimeter Array (SMA) toward the center of the Seyfert 2 galaxy M51. The image shows a strong concentration at the nucleus and weak emission from the spiral arm to the northwest. The integrated intensity of the central component in 12CO (J = 3-2) is almost twice as high as that in 12CO (J = 1-0), indicating that the molecular gas within an ~80 pc radius of the nucleus is warm (≳100 K) and dense (~104 cm-3). Similar intensity ratios are seen in shocked regions in our Galaxy, suggesting that these gas properties may be related to active galactic nucleus or starburst activity. The central component shows a linear velocity gradient (~1.4 km s-1 pc-1) perpendicular to the radio continuum jet, similar to that seen in previous observations and interpreted as a circumnuclear molecular disk/torus around the Seyfert 2 nucleus. In addition, we identify a linear velocity gradient (0.7 km s-1 pc-1) along the jet. Judging from the energetics, the velocity gradient can be explained by supernova explosions or energy and momentum transfer from the jet to the molecular gas via interaction, which is consistent with the high-intensity ratio.
邻近塞弗特星系 NGC 1068 中稠密分子气体的 HCN(J=1-0)/CO(J=1-0) 强度比
DOI：
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发表时间：
2022
期刊：
影响因子：
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作者：
Yumi Watanabe;Kazuharu Bamba;Shuro Takano;Toshiki Saito;Nanase Harada;Imanishi Masatoshi;Junko Ueda;Taku Nakajima;Yoichi Tamura;Akio Taniguchi;Kotaro Kohno;Yuri Nishimura;Takuma Izumi;Tomoka Tosaki
通讯作者：
Tomoka Tosaki