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arXiv 1802.09290astro-ph.GAastro-ph.IM
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一种表征宽带无线电谱能量分布的新方法

A novel approach for characterising broadband radio spectral energy distributions

V. M. Harvey, T. Franzen, J. Morgan, N. Seymour

摘要:

我们提出了一个新的宽带射频目录在0.12 GHz的$\le ν\le$ 20 GHz的Murchison宽场阵列委托调查,澳大利亚望远镜20千兆赫调查,和文献相结合的数据创建。我们的目录包括1285个来源的限制$S_{20\,\rm{GHz}} >$ 40毫焦耳在$5σ$,并包含通量密度测量(或估计)和不确定性在0.074,0.080,0.119,0.150,0.180,0.408,0.843,1.4,4.8,8.6和20 GHz。我们拟合一个二阶多项式在对数-对数空间的光谱能量分布的所有这些来源,以消除其宽带发射。对于线性或二次模型描述良好的994个源,我们提出了一个新的诊断图,按线性和曲率项排列源。我们证明了这样一个情节的优势,传统的无线电彩色图。我们还提出了天体物理的描述,发现在这个新的参数空间的每一个部分的来源,并讨论了这些情节在即将到来的大面积,深,宽带无线电调查时代的效用。

英文摘要:

We present a new broadband radio frequency catalogue across 0.12 GHz $\le ν\le$ 20 GHz created by combining data from the Murchison Widefield Array Commissioning Survey, the Australia Telescope 20 Gigahertz survey, and the literature. Our catalogue consists of 1285 sources limited by $S_{20\,\rm{GHz}} >$ 40 mJy at $5σ$, and contains flux density measurements (or estimates) and uncertainties at 0.074, 0.080, 0.119, 0.150, 0.180, 0.408, 0.843, 1.4, 4.8, 8.6, and 20 GHz. We fit a second-order polynomial in log-log space to the spectral energy distributions of all these sources in order to characterise their broadband emission. For the 994 sources which are well-described by a linear or quadratic model we present a new diagnostic plot arranging sources by the linear and curvature terms. We demonstrate the advantages of such a plot over the traditional radio colour-colour diagram. We also present astrophysical descriptions of the sources found in each segment of this new parameter space and discuss the utility of these plots in the upcoming era of large area, deep, broadband radio surveys.

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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