High Angular Resolution Observations of the (J, K) = (1, 1), (2, 2), and (3, 3) Transitions of Ammonia in NGC 253
High Angular Resolution Observations of the (J, K) = (1, 1), (2, 2), and (3, 3) Transitions of Ammonia in NGC 253
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DOI：
10.1093/pasj/57.4.549
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发表时间：
2005-08
影响因子：
2.3
通讯作者：
S. Takano;P. Hofner;G. Winnewisser;N. Nakai;K. Kawaguchi
中科院分区：
文献类型：
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作者：
S. Takano;P. Hofner;G. Winnewisser;N. Nakai;K. Kawaguchi
附近的星暴星系NGC 253在23 GHz区域用甚大阵在氨（J，K）=（1，1），（2，2），和（3，3）线上绘制。角分辨率约为4（cid：2）× 3（cid：2）（cid：2）。三个品系的分布各不相同。（1，1）和（3，3）线主要沿沙洲沿着分布在中心的东北和西南部区域，而（2，2）线主要分布在中心的西南部区域的两个团块上。此外，（1，1）线显示在中心区域的吸收。得到的旋转温度< 15- 28 K（下限），取决于团块。氨分布与我们已经发表的单皿结果的估计基本一致。并与连续谱线和其它几种分子谱线的分布作了比较。
The nearby starburst galaxy NGC 253 was mapped in the ammonia ( J,K ) = (1 , 1), (2 , 2), and (3 , 3) lines in the 23 GHz region with the Very Large Array. The angular resolutions were about 4 (cid:2)(cid:2) × 3 (cid:2)(cid:2) . The distributions of the three lines were different from one another. The (1 , 1) and (3 , 3) lines were distributed along the bar mainly at the northeastern and southwestern regions from the center, but the (2 , 2) line is distributed mainly at two clumps in the southwestern region from the center. In addition, the (1 , 1) line showed absorption at the central region. The obtained rotational temperatures were < 15–28K (lower limit), depending on the clumps. The ammonia distributions are generally consistent with estimates from our single-dish results already published. The distributions of ammonia were compared with those of continuum and several other molecular lines.