Detection of reactive ions in the ultracompact HII regions Mon R2 and G29.96-0.02

Details Detection of reactive ions in the ultracompact HII regions Mon R2 and G29.96-0.02 Detection of reactive ions in the ultracompact HII regions Mon R2 and G29.96-0.02

2003-09-22

arxiv.org/abs/astro-ph/0309576v1

Astrophys.J.597:L153-L156,2003

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures. Accepted by Astrophysical Journal Letters

Scientific paper

10.1086/379867

We report the first detection of the reactive ions CO+ and HOC+ towards ultracompact (UC) HII regions, particularly in Mon R2 and G29.96-0.02. We have observed two positions in Mon R2, namely the peak of the UC HII region and a position in the high density molecular cloud which bounds it. CO+ and HOC+ were detected at the UC HII region but not at the molecular cloud, as expected if the CO$^+$ and HOC$^+$ emissions arise in the PDR surrounding the \uch. The measured CO$^+$ and HOC$^+$ column densities are of the order of 10$^{11}$ cm$^{-2}$ in both sources, which yields a strikingly low [HCO$^+$]/[HOC$^+$] abundance ratio of 460 in Mon R2. These values are similar to those found in some other well-known PDRs, like NGC 7023 and the Orion Bar. We briefly discuss the chemical implications of these results.

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