论文标题
从行星星云NGC 7027中检测从氦气离子（heh $^+$）的振动排放检测
Detection of vibrational emissions from the helium hydride ion (HeH$^+$) in the planetary nebula NGC 7027
论文作者
论文摘要
我们报告了V = 1-0 P（1）（3.51629微米）和p（2）（3.60776微米）在氦氢阳离子（HEH+）中的p（3.60776微米）的检测检测。从行星NGC 7027中，这些检测是通过iShell Spectragrapch on nun innun innun innun innun innun innun innun innun innun innun innun innun innun innun innun innun innun innun innun irescograph（heh+）。确认Guesten等人最近报道的HEH+的发现。 （2019年），他使用索非亚空降天文台上的优质仪器观察其纯旋转j = 1-0在149.137微米时。 HEH+ V = 1-0 P（1）线测量的通量与我们在NGC 7027中的形成，破坏和激发的模型吻合。讨论了这些差异的可能原因。我们对NGC 7027的观察结果涵盖了3.26-3.93微光谱区域，导致检测到60多个光谱线，包括CH+的9次旋转式排放。后者是在天文来源中首次检测到的。
We report the detection of emission in the v=1-0 P(1) (3.51629 micron) and P(2) (3.60776 micron) rovibrational lines of the helium hydride cation (HeH+) from the planetary nebula NGC 7027. These detections were obtained with the iSHELL spectrograph on NASA's Infrared Telescope Facility (IRTF) on Maunakea. The confirm the discovery of HeH+ reported recently by Guesten et al. (2019), who used the GREAT instrument on the SOFIA airborne observatory to observe its pure rotational J=1-0 transition at 149.137 micron. The flux measured for the HeH+ v=1-0 P(1) line is in good agreement with our model for the formation, destruction and excitation of HeH+ in NGC 7027. The measured strength of the J=1-0 pure rotational line, however, exceeds the model prediction significantly, as does that of the v=1-0 P(2) line, by factors of 2.9 and 2.3 respectively. Possible causes of these discrepancies are discussed. Our observations of NGC 7027, covering the 3.26 - 3.93 micron spectral region, have led to the detection of more than sixty spectral lines including nine rovibrational emissions from CH+. The latter are detected for the first time in an astronomical source.
