Detection of HOC^+ toward the Orion Bar and M17-SW: Enhanced Abundances in Photon-dominated Regions?

Details Detection of HOC^+ toward the Orion Bar and M17-SW: Enhanced Abundances in Photon-dominated Regions? Detection of HOC^+ toward the Orion Bar and M17-SW: Enhanced Abundances in Photon-dominated Regions?

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...519l..89a&link_type=abstract

The Astrophysical Journal, Volume 519, Issue 1, pp. L89-L92.

Astronomy and Astrophysics

Astronomy

11

Ism: Abundances, Ism: Molecules, Line: Identification

Scientific paper

New measurements of HOC^+ emission have been carried out toward several photon-dominated regions using the National Radio Astronomy Observatory 12 m telescope. Toward the Orion bar, the J=1-->0, 2-->1, and 3-->2 transitions of HOC^+ at 89, 179, and 268 GHz were detected, as well as the J=1-->0 line in M17-SW. In conjunction with observations of HC^18O^+, [HCO^+]/[HOC^+] abundance ratios have been established in these objects. Toward M17-SW, a ratio of ~2260 was found. In the Orion bar, on the other hand, this ratio was determined to be [HCO^+]/[HOC^+]~270, both from J=1-->0 and J=2-->1 measurements-the lowest ratio thus far found in the Galaxy, and remarkably different from the value of 1800 found in nearby OMC-1. Moreover, the fractional abundance of HOC^+ was found to be f>~7x10^-12 in this source, the highest value yet observed for this molecular ion. The Orion bar observations suggest that the abundance of HOC^+ is enhanced relative to HCO^+ because of the unique chemistry of photon-dominated regions.

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