The excitation mechanisms and evolutionary stages of UWISH2 planetary nebula candidates

The excitation mechanisms and evolutionary stages of UWISH2 planetary nebula candidates
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UWISH2行星状星云候选者的激发机制和演化阶段

DOI:
10.1093/mnras/sty1931
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发表时间:
2018
影响因子:
4.8
通讯作者:
Jones A
Jones A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Jones A

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我们提出了中等分辨率K波段长缝光谱的29个真实的,可能的,可能的,和候选人的银河系平面行星状星云(PNE)从UWISH 2调查,其中许多只是最近才发现的。这些物体在分子氢(H2)发射中是明亮的,并且许多具有双极形态。通过对Brγ发射线的探测,我们发现大多数的候选天体确实可能是PNe,而其中两个目标更可能是年轻恒星天体(YSO)或行星前星云(pPNe)。我们在13个在IPHAS或SHS Hα巡天中没有探测到的天体中探测到Brγ。这意味着它们是鲜为人知的光学模糊PN人口的潜在成员,隐藏在宽视场光学调查中。我们利用H21-0 S(1)和Brγ线的空间范围来估计目标的演化阶段,发现W-BPNe(具有捏腰形态的双极PNe)可能是更年轻的天体,而R-BPNe(具有大环结构的双极PNe)可能是更演化的天体。我们使用线比来追踪H2的激发机制,发现R-BPNe的1-0 S(1)/ 2-1 S(1)和1-0 S(1)/ Brγ比较高,这意味着H2是热激发的。然而,在W-BPNe中,这些比率较低,因此UV荧光可能有助于激发H2。
We present medium-resolutionK-band long-slit spectroscopy of 29 true, likely, possible, and candidate Galactic Plane planetary nebulae (PNe) from the UWISH2 survey, many of which have only been recently discovered. These objects are bright in molecular hydrogen (H2) emission, and many have bipolar morphologies. Through the detection of the Brγ emission line, which traces ionized hydrogen, we find that the majority of the candidate PNe are indeed likely to be PNe, while 2 of the targets are more likely young stellar objects (YSOs) or pre-planetary nebulae (pPNe). We detect Brγ in 13 objects which have no detection in IPHAS or SHS Hα surveys. This implies that they are potential members of the little-known optically obscured PN population, hidden from wide-field optical surveys. We use the spatial extent of the H21-0 S(1) and Brγ lines to estimate the evolutionary stage of our targets, and find that W-BPNe (bipolar PNe with pinched waist morphologies) are likely to be younger objects, while R-BPNe (bipolar PNe with large ring structures) are more evolved. We use line ratios to trace the excitation mechanism of the H2, and find the 1-0 S(1) / 2-1 S(1) and 1-0 S(1) / Brγ ratios are higher for R-BPNe, implying the H2is thermally excited. However, in W-BPNe, these ratios are lower, and so UV-fluorescence may be contributing to the excitation of H2.
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