Far-infrared spectroscopic observations of the Galactic center region
Far-infrared spectroscopic observations of the Galactic center region
复制标题
银河系中心区域的远红外光谱观测
DOI：
10.1051/0004-6361:20078559
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发表时间：
2008
影响因子：
6.5
通讯作者：
H. Kaneda
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文献类型：
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作者：
A. Yasuda;T. Nakagawa;M. Spaans;Y. Okada;H. Kaneda
上下文银河系中心区域在远红外（FIR）区域是明亮的，但这种光度的主要来源仍然存在争议。目标。我们利用远红外多线光谱技术研究了银河系中心区弥漫星际介质的物理条件。方法.我们分析了银河系中心区域的档案数据与长波光谱仪上的红外空间天文台。我们检测到强的连续发射和精细结构的发射线从光解离和H ii区域，包括[O i ]和[Cii]线，是星际云的主要冷却剂。结果观测结果表明，[C ii]/FIR比值系统性地较低，而[O i]/FIR比值在银河系中心区域几乎是恒定的。利用光离解区模型和观测到的FIR参数，我们得到银河系中心区的辐射有效温度为6600 ± 300 K，明显低于银盘区的8600 ± 500 K。结论.银河系中心区远红外区光度的主要来源不太可能是年轻的OB星，而是冷星，K和M巨星，这意味着银河系中心区目前的恒星形成活动相当低。
Context. The Galactic center region is luminous in the far-infrared (FIR), but dominant sources of this luminosity are still controversial. Aims. We investigate physical conditions of the diffuse interstellar medium in the Galactic center region by multi-line spectroscopy in the FIR. Methods. We analyze the archival data of the Galactic center region obtained with the Long-Wavelength Spectrometer on board the Infrared Space Observatory. We detect strong continuum emission and fine-structure emission lines from photo-dissociation and H ii regions, including [O i ]a nd [Cii] lines that are dominant coolants of interstellar clouds. Results. The observations show that the [C ii]/FIR ratio is systematically low whereas the [O i]/FIR ratio is almost constant toward the Galactic center region. By using a photo-dissociation region model with observed FIR parameters, we obtain radiation an effective temperature of 6600 ± 300 K in the Galactic center region, which is significantly lower than 8600 ± 500 K in the Galactic disk region. Conclusions. Dominant sources of the FIR luminosity in the Galactic center region are not likely to be young OB stars but rather cool stars, K and M giants, which implies that the current star-formation activity is rather low in the Galactic center region.
Hiroshi Shibai：“来自银河平面的远红外连续发射”（待公布）。
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