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arXiv 1807.09336astro-ph.SR
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大质量恒星形成的无线电和红外线协同巡天。IV：一个新的致密银河系行星状星云射电精选样本

The Coordinated Radio and Infrared Survey for High-mass Star Formation. IV: A new radio selected sample of compact Galactic Planetary Nebulae

T. Irabor, M. G. Hoare, R. D. Oudmaijer, J. S. Urquhart, S. Kurtz, S. L. Lumsden, C. R. Purcell, A. A. Zijlstra, G. Umana

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摘要：

我们提出了一个新的无线电选择的样本PNE从CORNISH调查。这是一次银河内面射电连续巡天，覆盖银河经度$10^\circ <l< 65^\circ$和纬度$|b| < 1^\circ$，分辨率为1.5 $^{"}$，灵敏度优于0.4毫焦耳/波束。无线电状况，不受尘埃消光的影响，允许更完整的样本选择，特别是朝向银河系中平面。对CORNISH数据的目视检查，结合银河平面多波长调查的数据，使CORNISH团队能够识别169个候选PNe。在这里，我们探索使用多波长诊断图和分析，以验证和分类的候选PNe。我们提出了这种新的PNe样品的多波长特性。我们发现了90个新的PNe，其中12个是新发现的，78个是新分类的PN。另外47个先前怀疑的PNe从这里提出的分析中得到证实，并检测到24个已知的PNe。八个源被分类为可能的PNe或其他源类型。我们的样本包括一个年轻的子样本，物理直径< 0.12 pc，亮度温度（> 1000 K），位置接近7 kpc。在这个样本中有一个光谱指数为$-0.55\pm 0.08$的水脉泽PN，它表明了非热射电辐射。这样一个无线电选择的样品，不受灭绝，将是特别有用的人口合成模型进行比较，并应有助于了解的形成和演变的PNE。

英文摘要：

We present a new radio-selected sample of PNe from the CORNISH survey. This is a radio continuum survey of the inner Galactic plane covering Galactic longitude, $10^\circ <l< 65^\circ$ and latitude, $|b| < 1^\circ$ with a resolution of 1.5$^{"}$ and sensitivity better than 0.4 mJy/beam. The radio regime, being unbiased by dust extinction, allows for a more complete sample selection, especially towards the Galactic mid-plane. Visual inspection of the CORNISH data, in combination with data from multi-wavelength surveys of the Galactic plane, allowed the CORNISH team to identify 169 candidate PNe. Here, we explore the use of multi-wavelength diagnostic plots and analysis to verify and classify the candidate PNe. We present the multi-wavelength properties of this new PNe sample. We find 90 new PNe, of which 12 are newly discovered and 78 are newly classified as PN. A further 47 previously suspected PNe are confirmed as such from the analysis presented here and 24 known PNe are detected. Eight sources are classified as possible PNe or other source types. Our sample includes a young sub-sample, with physical diameters < 0.12 pc, brightness temperatures (> 1000 K) and located closer than 7 kpc. Within this sample is a water-maser PN with a spectral index of $-0.55\pm 0.08$, which indicates non-thermal radio emission. Such a radio-selected sample, unaffected by extinction, will be particularly useful to compare with population synthesis models and should contribute to the understanding of the formation and evolution of PNe.

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