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arXiv 1005.3422astro-ph.CO
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M33中的冷气体和尘埃:来自Herschel M33扩展调查(HERM33ES)的结果

Cool gas and dust in M33: Results from the Herschel M33 extended survey (HERM33ES)

J. Braine, P. Gratier, C. Kramer, E. M. Xilouris, E. Rosolowsky, C. Buchbender, M. Boquien, D. Calzetti, G. Quintana-Lacaci, F. Tabatabaei, S. Verley, F. Israel… 展开作者

J. Braine, P. Gratier, C. Kramer, E. M. Xilouris, E. Rosolowsky, C. Buchbender, M. Boquien, D. Calzetti, G. Quintana-Lacaci, F. Tabatabaei, S. Verley, F. Israel, F. van der Tak, S. Aalto, F. Combes, S. Garcia-Burillo, M. Gonzalez, C. Henkel, B. Koribalski, B. Mookerjea, M. Roellig, K. F. Schuster, M. Relano, F. Bertoldi, P. van der Werf, M. Wiedner

摘要:

我们提出了一个分析的第一个天基远红外submm观测的M 33,测量冷尘埃的排放和解决巨大的分子云复合物。大约半太阳的丰度,M33是年轻的低金属量星系的第一步,其中submm可能能够提供一个替代CO映射来测量其H $_2$内容。在这封信中,我们测量尘埃排放截面$σ$使用SPIRE和最近的CO和\HI \的观测;在$σ$的变化是目前从近太阳附近的横截面约半个太阳的最大值是南部的核。从测得的尘埃温度和横截面计算总H柱密度,然后减去\HI \柱,得到类似于在CO中观察到的形态。H $_2$ / \HI \质量比从约1降至远低于10%,在光盘上平均约为15%。减少潜在的大系统误差的唯一最重要的观测是完成M33的CO制图。

英文摘要:

We present an analysis of the first space-based far-IR-submm observations of M 33, which measure the emission from the cool dust and resolve the giant molecular cloud complexes. With roughly half-solar abundances, M33 is a first step towards young low-metallicity galaxies where the submm may be able to provide an alternative to CO mapping to measure their H$_2$ content. In this Letter, we measure the dust emission cross-section $σ$ using SPIRE and recent CO and \HI\ observations; a variation in $σ$ is present from a near-solar neighborhood cross-section to about half-solar with the maximum being south of the nucleus. Calculating the total H column density from the measured dust temperature and cross-section, and then subtracting the \HI\ column, yields a morphology similar to that observed in CO. The H$_2$/\HI\ mass ratio decreases from about unity to well below 10% and is about 15% averaged over the optical disk. The single most important observation to reduce the potentially large systematic errors is to complete the CO mapping of M 33.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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