CO 7. -->. 6 submillimeter emission from the Galactic center: Warm molecular gas and the rotation curve in the central 10 parsecs
CO 7. -->. 6 submillimeter emission from the Galactic center: Warm molecular gas and the rotation curve in the central 10 parsecs
复制标题
CO 7。-->。
DOI：
10.1086/184516
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
R. Genzel
中科院分区：
文献类型：
--
作者：
A. Harris;D. Jaffe;M. Silber;R. Genzel
我们已经绘制出明亮的CO J = 7. -->.中央有6条亚毫米线发射，占银河系的10个角。这是第一次检测到的7.. -->.. 6线从银河系中心，与一个新建造的亚毫米外差光谱仪。第372…Mu.. m CO排放来自温度约为300 K的致密盘（n/sub H/大致等于3 × 10/sup 4/ cm/sup-3/，质量大致等于10/sup 4/ M/sub sun/）。从这个直径约为4 '的区域发出的所有CO转动线的光度约为2 × 10 ~ 4/sup 4/ L/subsun/。CO谱线的发射对Sgr A附近星际气体的冷却有重要贡献。从中心流出的物质或云与云的碰撞可能会引起冲击，从而加热温暖的分子气体。冲击动能耗散率必须大于或等于2 × 10 ~（-5）/ L/sub sun/。这需要非常大的质量损失率（>或大约）。=0.5 M/亚太阳/年/sup-1/）或在很短的时间尺度（<或=5 x 10/sup 3/年）上整个区域云-云湍流的有效再生n。或者，如果CO的自屏蔽有效，来自银河系中心的紫外线辐射可以加热分子气体。然后，在“光解离”区域（A/sub v/<或=5）中，CO丰度»必须约为10/sup -4/，其中大部分紫外能量被吸收。«少
We have mapped bright CO J = 7 ..-->.. 6 submillimeter line emission in the central; 10 pc of the Galaxy. This is the first detection of the 7 ..-->.. 6 line from the Galactic center, made with a newly constructed submillimeter heterodyne spectrometer. The 372 ..mu..m CO emission comes from a dense, clumpy disk (n/sub H/roughly-equal3 x 10/sup 4/ cm/sup -3/, mass roughly-equal10/sup 4/ M/sub sun/) of temperature approx.300 K. The luminosity of all CO rotational lines emitted from this approx.4' diameter region is about 2 x 10/sup 4/ L/sub sun/. CO line emission is a major contribution to the cooling of the interstellar gas near Sgr A. Mass outflow from the center or cloud-cloud collisions may cause shocks which heat the warm molecular gas. The kinetic energy dissipation rate in shocks necessary is > or =2 x 10/sup 5/ L/sub sun/. This requires a very large mass-loss rate (> or approx. =0.5 M/sub sun/ yr/sup -1/) or efficient regenerationn of cloud-cloud turbulence throughout the region on a very short time scale (< or =5 x 10/sup 3/ yr). Alternatively, UV radiation from the Galactic center could heat the molecular gas if CO self-shielding is effective. The CO abundancemore » must then be approx.10/sup -4/ in the ''photodissociation'' region (A/sub v/< or =5), where most of the UV energy is absorbed.« less