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arXiv 1402.2369astro-ph.SR
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发现新的低激发行星状星云

Discovery of new low-excitation planetary nebulae

Chih-Hao Hsia, Yong Zhang

摘要:

我们报告了一个多波长的研究,四个新的行星状星云(PN)的候选人选择从INT/WFC测光哈调查的北银河平面(IPHAS)和深空猎人(DSH)目录。我们提出了这些PN的中分辨率光谱。通过光学窄带图像和中分辨率光谱证实了我们样品的PN状态。根据这些天体在log(Ha/[N II])与log(Ha/[S II])诊断图中的位置,我们得出结论,这些源是演化的低激发PN。讨论了这些新发现的PNs的光学和红外形貌。这里研究的三个新星云是在红外线中检测到的,并且红外线与无线电通量的比率很低,这可能表明它们是进化的。此外,我们推导出这些星云的动力学年龄和距离,并研究了光谱能量分布,其中一个广泛的红外档案数据。

英文摘要:

We report a multi-wavelength study of four new planetary nebula (PN) candidates selected from the INT/WFC Photometric Ha Survey of the Northern Galactic Plane (IPHAS) and Deep Sky Hunter (DSH) catalogues. We present mid-resolution optical spectra of these PNs. The PN status of our sample was confirmed by optical narrow-band images and mid-resolution spectra. Based on the locations of these objects in the log (Ha/[N II]) versus log (Ha/[S II]) diagnostic diagram, we conclude that these sources are evolved lowexcitation PNs. The optical and infrared appearances of these newly discovered PNs are discussed. Three of the new nebulae studied here are detected in infrared and have low infrared-to-radio flux ratios, probably suggesting that they are evolved. Furthermore, we derive the dynamical ages and distances of these nebulae and study the spectral energy distribution for one of them with extensive infrared archival data.

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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