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First results from the UHRF: ultra-high-resolution observations of interstellar CH, CH+ and CN towards ζ Ophiuchi

Crawford, IA; Barlow, MJ; Diego, F; Spyromilio, J; (1994) First results from the UHRF: ultra-high-resolution observations of interstellar CH, CH+ and CN towards ζ Ophiuchi. Monthly Notices of the Royal Astronomical Society , 266 (4) pp. 903-909. 10.1093/mnras/266.4.903. Green open access

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Abstract

We present ultra-high-resolution observations (R>700 000) of interstellar CH, CH+ and CN towards ζ Oph obtained with the newly commissioned Ultra-High-Resolution Facility (UHRF) at the AAT. The molecular lines have all been fully resolved, and we discuss their implications for this well-studied molecular sightline. The CH and CN lines each consist of two narrow (b≈0.5 km s−1) components separated by 1.13±0.10 km s−1⁠; an additional broad (b=1.8 km s−1) component is present in CH. We show that the very broad (b=2.1 km s−1) CH+ line profile is consistent with the formation of this molecule in warm haloes surrounding the cold cores responsible for the narrow CH and CN components.

Type: Article
Title: First results from the UHRF: ultra-high-resolution observations of interstellar CH, CH+ and CN towards ζ Ophiuchi
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/266.4.903
Publisher version: https://doi.org/10.1093/mnras/266.4.903
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: line: profiles, stars: individual: ζ Oph, ISM: molecules
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10096171
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