An energetic high-velocity compact cloud: CO-0.31+0.11
An energetic high-velocity compact cloud: CO-0.31+0.11
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充满活力的高速致密云：CO-0.31 0.11
DOI：
10.1093/pasj/psz027
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发表时间：
2019
影响因子：
2.3
通讯作者：
Shibuya Yukihiro
中科院分区：
文献类型：
--
作者：
Takekawa Shunya;Oka Tomoharu;Tokuyama Sekito;Tanabe Kyosuke;Iwata Yuhei;Tsujimoto Shiho;Nomura Mariko;Shibuya Yukihiro
我们在银河系中央分子带发现了一个高能高速致密云CO0.11。CO0.11位于距星系核Sgr a *约45pc的投影距离上。其特征是空间形态紧凑（d≃4 pc），速度宽度极宽（ΔV> 100 km s−1），COJ= 3-2 /J= 1 - 0强度比高。气体的总质量和动能分别约为1051能量。在Nobeyama射电天文台45米望远镜获得的HCNJ= 1-0图中发现了两个膨胀的气泡状结构。在经速图中，CO0.11呈现不对称的V型。这种运动结构可以很好地拟合开普勒在偏心轨道上围绕质点的运动。COJ= 3-2 /J= 1-0比值的增大可能与中心周围通道的潮汐压缩有关。该模型表明，一个巨大的质量被包裹在小于0.1 pc的半径内。巨大的质量，致密性和没有发光的恒星对应物可能对应于内部一个中等质量黑洞（IMBH）的特征。我们提出了一种CO0.11的形成场景，在这种场景中，一个致密云与一个IMBH发生了引力相互作用，而双极分子外流是由假定的IMBH过去的活动驱动的。
We have discovered an energetic high-velocity compact cloud CO0.11 in the central molecular zone of our Galaxy. CO0.11 is located at a projected distance of ∼45 pc from the Galactic nucleus Sgr A*. It is characterized by its compact spatial appearance (d≃ 4 pc), extremely broad velocity width (ΔV> 100 km s−1), and high COJ= 3–2/J= 1–0 intensity ratio. The total gas mass and kinetic energy are estimated as approximatelyand 1051erg, respectively. Two expanding bubble-like structures are found in our HCNJ= 1–0 map obtained with the Nobeyama Radio Observatory 45 m telescope. In the longitude–velocity maps, CO0.11 exhibits an asymmetric V shape. This kinematical structure can be well fitted by Keplerian motion on an eccentric orbit around a point mass of. The enhanced COJ= 3–2/J= 1–0 ratio is possibly attributed to the tidal compression during the pericenter passage. The model suggests that a huge mass is packed within a radius ofr< 0.1 pc. The huge mass, compactness, and absence of luminous stellar counterparts may correspond to a signature of an intermediate-mass black hole (IMBH) inside. We propose a formation scenario of CO0.11 in which a compact cloud has gravitationally interacted with an IMBH and a bipolar molecular outflow was driven by the past activity of the putative IMBH.