在O富营养星行盘NGC 6302中检测到CH3+
星系天体物理
2025-09-19 v1
摘要
星行盘是星际物质演化为复杂分子的场所，但主导这些过程的精确物理条件和化学路径尚不清楚。C富环境中O富分子的存在尤其具有挑战性。本文报告了在O富营养星行盘NGC 6302中首次检测到甲基阳离子(CH3+)，该检测通过JWST MIRI/MRS观测实现。CH3+是紫外辐照环境中有机化学的关键驱动因子。空间分辨观测显示，CH3+与12CO、H2、H II、HCO+和多环芳烃(PAHs)共位于同一位置。对CH3+发射进行LTE模型拟合，结果显示在NGC 6302的内侧气泡和环状结构中，激发温度为500-800K；在外侧气泡中，激发温度升至1000-2000K；柱密度范围为~10^11至10^13 cm^-2。该检测表明，天文星行盘化学模型必须纳入羟基有机化学网络。进一步的近红外观测对于映射这些环境中不同化学网络的运行至关重要。
引用
@article{arxiv.2509.14556,
title = {Detection of CH3+ in the O-rich planetary nebula NGC 6302},
author = {Charmi Bhatt and Jan Cami and Els Peeters and Nicholas Clark and Paula Moraga Baez and Kevin Volk and G. C. Sloan and Joel H. Kastner and Harriet L. Dinerstein and Mikako Matsuura and Bruce Balick and Kathleen E. Kraemer and Kay Justtanont and Olivia Jones and Raghvendra Sahai and Isabel Aleman and Michael J. Barlow and Jeronimo Bernard-Salas and Joris Blommaert and Naomi Hirano and Patrick Kavanagh and Francisca Kemper and Eric Lagadec and J. Martin Laming and Frank Molster and Hektor Monteiro and Anita M. S. Richards and N. C. Sterling and Maryam Torki and Peter A. M. van Hoof and Jeremy R. Walsh and L. B. F. M. Waters and Roger Wesson and Finnbar Wilson and Nicholas J. Wright and Albert A. Zijlstra},
journal= {arXiv preprint arXiv:2509.14556},
year = {2025}
}