斯皮策/IRS发现的尘埃行星状星云的VLT/X射线发射光谱
VLT/X-shooter Spectroscopy of a Dusty Planetary Nebula Discovered with Spitzer/IRS
摘要：
作为斯皮策太空望远镜对年轻恒星进行中红外光谱调查的一部分，发现了一个未分类的红色发射线物体。根据斯皮策光谱所显示的高电离状态，该天体可能是一个尘埃超新星遗迹（SNR）或行星状星云（PN）。在本研究报告中，对该物体进行了分类，并向社区提供了可用的光谱数据以供进一步分析。在VLT/X-shooter的科学验证运行期间获得UV/光学/NIR光谱。大量的发射线被确定，允许确定该对象的性质。强、窄（Δ_v ~ 8 - 74 km/s）发射谱线的存在，加上极低的谱线比率，例如，[N II]/Halpha和[S II]/Halpha表明该天体是一个行星状星云（PN），位于巨蛇座分子云后面的一个未知距离处。这说明了X-shooter作为约束具有未知光谱特性或颜色的微弱源的性质的有效工具的潜力。
英文摘要：
As part of a mid-infrared spectroscopic survey of young stars with the Spitzer Space Telescope, an unclassified red emission line object was discovered. Based on its high ionization state indicated by the Spitzer spectrum, this object could either be a dusty Supernova Remnant (SNR) or a Planetary Nebula (PN). In this research note, the object is classified and the available spectroscopic data are presented to the community for further analysis. UV/optical/NIR spectra were obtained during the science verification run of the VLT/X-shooter. A large number of emission lines are identified allowing the determination of the nature of this object. The presence of strong, narrow (Delta_v ~ 8 - 74 km/s) emission lines, combined with very low line ratios of, e.g., [N II]/Halpha and [S II]/Halpha show that the object is a Planetary Nebula (PN) that lies at an undetermined distance behind the Serpens Molecular Cloud. This illustrates the potential of X-shooter as an efficient tool for constraining the nature of faint sources with unknown spectral properties or colors.
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