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arXiv 0801.4294astro-ph
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银河系中心区的GBT多波长巡天

GBT Multiwavelength Survey of the Galactic Center Region

C. J. Law, F. Yusef-Zadeh, W. D. Cotton, R. J. Maddalena

摘要:

我们描述了一个无线电连续调查的中心4x 1deg与100米绿岸望远镜(GBT)在3.5,6,20和90厘米的波长的结果。3.5和6厘米的调查是最敏感和最高分辨率的单碟调查我们的银河系的中心度。我们目前的目录中的紧凑和扩展源在中央四度的银河系,包括详细的光谱指数研究的所有来源。分析涵盖了恒星形成区域,如Sgr B和Sgr C,我们发现了热发射和非热发射混合物的证据。分析量化的相对贡献的热和非热过程的无线电连续通量密度向GC区域。在GC的中心4x 1度,所有致密源和漫射源的热通量和非热通量比例在3.5 cm处为28%/72%,在6 cm处为19%/81%。在3.5cm和6cm处,这些源的总通量密度分别为783 ± 52 Jy和1063 ± 93 Jy,不包括银河系同步辐射的贡献。

英文摘要:

We describe the results of a radio continuum survey of the central 4x1deg with the 100 m Green Bank Telescope (GBT) at wavelengths of 3.5, 6, 20, and 90 cm. The 3.5 and 6 cm surveys are the most sensitive and highest resolution single dish surveys made of the central degrees of our Galaxy. We present catalogs of compact and extended sources in the central four degrees of our Galaxy, including detailed spectral index studies of all sources. The analysis covers star-forming regions such as Sgr B and Sgr C where we find evidence of a mixture of thermal and nonthermal emission. The analysis quantifies the relative contribution of thermal and nonthermal processes to the radio continuum flux density toward the GC region. In the central 4x1deg of the GC, the thermal and nonthermal flux fractions for all compact and diffuse sources are 28%/72% at 3.5 cm and 19%/81% at 6 cm. The total flux densities from these sources are 783+-52 Jy and 1063+-93 Jy at 3.5 and 6 cm, respectively, excluding the contribution of Galactic synchrotron emission.

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