Maps of comet C/1995 O1 (Hale-Bopp) in the millimeter-wave emission of the ion HCO+ revealed a local minimum near the nucleus position, with a maximum about 100,000 km in the antisolar direction. These observed features of the HCO+ emission require a low abundance of HCO+ due to enhanced destruction in the inner coma of the comet, within a region of low electron temperature (Te). To set constraints on the formation of HCO+ in the coma, as well as the location and magnitude of the transition to higher Te, the data are compared with the results of ion-molecule chemistry models.

中文翻译：

---

HCO +在黑尔-波普彗星昏迷中。

在HCO +离子的毫米波发射中，彗星C / 1995 O1（Hale-Bopp）的图显示了靠近原子核位置的局部最小值，反太阳方向的最大值约为100,000 km。这些观测到的HCO +发射特征由于在低电子温度（Te）区域内彗星内彗差的破坏作用增强而需要低含量的HCO +。为了设置对昏迷中HCO +的形成以及向更高Te过渡的位置和幅度的限制，将数据与离子分子化学模型的结果进行比较。