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.

arXiv comment9 pages, 8 figures, 4 tables

References in corpus (12)

• The IRAM-30m line survey of the Horsehead PDR: II. First detection of the l-C3H+ hydrocarbon cation
• Photon-Dominated Chemistry in the Nucleus of M82: Widespread HOC+ emission in the inner 650 pc disk
• Surviving the hole I: Spatially resolved chemistry around Sgr A*
• The ionization fraction gradient across the Horsehead edge: An archetype for molecular clouds
• High-Accuracy Quartic Force Field Calculations for the Spectroscopic Constants and Vibrational Frequencies of 1 ^1A' l-C3H-: A Possible Link to Lines Observed in the Horsehead Nebula PDR
• Spectroscopic Constants and Vibrational Frequencies for l-C3H+ and Isotopologues from Highly-Accurate Quartic Force Fields: The Detection of l-C3H+ in the Horsehead Nebula PDR Questioned
• Photodissociation chemistry footprints in the Starburst galaxy NGC 253
• Spectral line survey of the ultracompact HII region Mon R2
• The abundance of HOC+ in diffuse clouds
• A Search for l-C3H+ and l-C3H in Sgr B2(N), Sgr B2(OH), and the Dark Cloud TMC-1
• An observational investigation of the identity of B11244 ($l$-C${}_3$H${}^{+}$/C${}_3$H${}^{-}$)
• A CSO Broadband Spectral Line Survey of Sgr B2(N)-LMH from 260 - 286 GHz

Cited by in corpus (7)

• 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
• An ATCA Survey of Sagittarius~B2 at 7~mm: Chemical Complexity Meets Broadband Interferometry
• 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
• The Molecular Chemistry of Diffuse and Translucent Clouds in the Line-of-Sight to Sgr B2