2012A&A...543L...1G


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.24CET01:13:35

2012A&A...543L...1G - Astronomy and Astrophysics, volume 543, L1-1 (2012/7-1)

The IRAM-30m line survey of the Horsehead PDR. I. CF+ as a tracer of C+ and as a measure of the fluorine abundance.

GUZMAN V., PETY J., GRATIER P., GOICOECHEA J.R., GERIN M., ROUEFF E. and TEYSSIER D.

Abstract (from CDS):

C+ is a key species in the interstellar medium, but its 158 µm fine structure line cannot be observed from ground-based telescopes. Current models of fluorine chemistry predict that CF+ is the second-most important fluorine reservoir in regions where C+ is abundant. We detected the J=1-0 and J=2-1 rotational lines of CF+ with high signal-to-noise ratio toward the photo-dissociation region and dense core positions in the Horsehead. Using a rotational diagram analysis, we derive a column density of N(CF+)=(1.5-2.0)x1012cm–2. Because of the simple fluorine chemistry, the CF+ column density is proportional to the fluorine abundance. We thus infer the fluorine gas-phase abundance to be F/H=(0.6-1.5)x10–8. Photochemical models indicate that CF+ is found in the layers where C+ is abundant. The emission arises in the UV-illuminated skin of the nebula, tracing the outermost cloud layers. Indeed, CF+ and C+ are the only species observed to date in the Horsehead with a double-peaked line profile caused by kinematics. We therefore propose that CF+, which is detectable from the ground, can be used as a proxy of the C+ layers.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: clouds - ISM: molecules - ISM: individual objects: Horsehead nebula - radio lines: ISM

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 738 0
2 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 751 0
3 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 451 0

    Equat.    Gal    SGal    Ecl

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2021.01.24-01:13:35

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