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arXiv 1909.08025astro-ph.GA
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银河系中心的2毫米GISMO观测。I.粉尘排放

2 mm GISMO Observations of the Galactic Center. I. Dust Emission

Richard G. Arendt, Johannes Staguhn, Eli Dwek, Mark R. Morris, Farhad Yusef-Zadeh, Dominic J. Benford, Attila Kovács, Junellie Gonzalez-Quiles

摘要:

利用30 m IRAM望远镜上的GISMO测热照相机,在2 mm处测得了覆盖银道面内~1 $^\circ$的中央分子带(CMZ)。$21''$分辨率图显示了大量来自冷分子云、恒星形成区和银河系中心非热灯丝的辐射。在这项工作中,我们使用赫歇尔Hi-GAL数据来模拟整个银河系中心的尘埃排放。我们发现,一个单一的温度适合可以描述160 - 500 $μ$ m发射的视线,如果长波长的灰尘发射率尺度为$λ^{-β}$与$β\approx 2.25$。外推该灰尘模型可预测2 mm的灰尘排放量。从GISMO数据中减去模型,可以更清楚地看到恒星形成区域的2 mm发射和最亮的非热灯丝。

英文摘要:

The Central Molecular Zone (CMZ), covering the inner ~1$^\circ$ of the Galactic plane has been mapped at 2 mm using the GISMO bolometric camera on the 30 m IRAM telescope. The $21''$ resolution maps show abundant emission from cold molecular clouds, from star forming regions, and from one of the Galactic center nonthermal filaments. In this work we use the Herschel Hi-GAL data to model the dust emission across the Galactic center. We find that a single-temperature fit can describe the 160 -- 500 $μ$m emission for most lines of sight, if the long-wavelength dust emissivity scales as $λ^{-β}$ with $β\approx 2.25$. This dust model is extrapolated to predict the 2 mm dust emission. Subtraction of the model from the GISMO data provides a clearer look at the 2 mm emission of star-forming regions and the brightest nonthermal filament.

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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