CO(J=3–2) Observations of MS 1512-cB58 at z=2.72
CO(J=3–2) Observations of MS 1512-cB58 at z=2.72
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CO(J=3–2) MS 1512-cB58 在 z=2.72 处的观测结果
DOI：
10.1093/pasj/49.5.535
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发表时间：
1997
影响因子：
2.3
通讯作者：
Y. Shioya
中科院分区：
文献类型：
--
作者：
K. Nakanishi;K. Ohta;T. Takeuchi;M. Akiyama;Toru Yamada;Y. Shioya
本文报道了对MS 1512-cB 58的12 CO（J = 3-2）发射谱线的搜索结果，MS 1512-cB 58是一个z = 2.72的候选星系。我们用野边山射电天文台的45米望远镜观测了该物体，没有发现明显的发射。CO（J = 3-2）线的3σ光度上限为4.4 × 1010 K km s− 1 pc 2，假设线速度宽度为300 km s−1;如果我们假设银河系中CO到H2的转换因子，这对应于2.0 × 1011 M的氢分子质量。MS 1512-cB 58的Hα线光度与CO光度之比的下限是在附近星系的比值范围内的上限。
We report on a search for12CO(J = 3–2) emission line toward MS 1512-cB58, a forming galaxy candidate at z = 2.72. We have observed the object with the 45-m telescope of the Nobeyama Radio Observatory, and found no significant emission. The 3σ upper limit of the CO(J = 3–2) line luminosity is 4.4 × 1010K km s−1pc2, assuming a line velocity width of 300 km s−1; this corresponds to a molecular hydrogen mass of 2.0 × 1011M⊙, if we assume the Galactic CO-to-H2conversion factor. A lower limit on the ratio of the Hα line luminosity to the CO luminosity of MS 1512-cB58 is at an upper part of, but within, the range of ratios for nearby galaxies.