A CSO Search for $l$-C${}_3$H${}^{+}$: Detection in the Orion Bar PDR

Abstract

The results of a Caltech Submillimeter Observatory (CSO) search for $l$-C${}_3$H${}^{+}$, first detected by Pety et al. (2012) in observations toward the Horsehead photodissociation region (PDR), are presented. A total of 39 sources were observed in the 1 mm window. Evidence of emission from $l$-C${}_3$H${}^{+}$ is found in only a single source - the Orion Bar PDR region, which shows a rotational temperature of 178(13) K and a column density of 7(2) x $10^{11}$ cm${}^{-2}$. In the remaining sources, upper limits of ~10${}^{11}-10^{13}$ cm${}^{-2}$ are found. These results are discussed in the context of guiding future observational searches for this species.

9 pages, 8 figures, 4 tables

Cited by in corpus (5)

• The chemistry and spatial distribution of small hydrocarbons in UV-irradiated molecular clouds: the Orion Bar PDR
• The interstellar chemistry of C3H and C3H2 isomers
• Discovery of C5H+ and detection of C3H+ in TMC-1 with the QUIJOTE line survey
• A new study of the chemical structure of the Horsehead nebula: the influence of grain-surface chemistry
• New molecular species at redshift z=0.89