2015A&A...579A..12L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:37:59

2015A&A...579A..12L - Astronomy and Astrophysics, volume 579A, 12-12 (2015/7-1)

Widespread galactic CF+ absorption: detection toward W49 with the Plateau de Bure Interferometer.

LISZT H.S., GUZMAN V.V., PETY J., GERIN M., NEUFELD D.A. and GRATIER P.

Abstract (from CDS):

We study the usefulness of CF+ as a tracer of the regions where C+ and H2 coexist in the interstellar medium. We used the Plateau de Bure Interferometer to synthesize CF+ J=1-0 absorption at 102.6GHz toward the core of the distant HII region W49N at l=43.2°, b=0.0°, and we modeled the fluorine chemistry in diffuse/translucent molecular gas. We detected CF+ absorption over a broad range of velocity showing that CF+ is widespread in the H2-bearing Galactic disk gas. Originally detected in dense gas in the Orion Bar and Horsehead PDR (Photon-Dominated Region) CF+ was subsequently detected in absorption from diffuse and translucent clouds seen toward BL Lac and 3C111. Here we showed that CF+ is distributed throughout the diffuse and translucent molecular disk gas with N(CF+/N(H2)=1.5-2.0x10–10, increasing to N(CF+/N(H2)=3.5x10–10 in one cloud at 39km/s having higher N(H2)=3x1021cm–2. Models of the fluorine chemistry reproduce the observed column densities and relative abundance of HF, from which CF+ forms, but generally overpredict the column density of CF+ by factors of 1.4-4. We show that a free space photodissociation rate Γ>10–9s–1, comparable to that of CH, might account for much of the discrepancy but a recent calculation finds a value about ten times smaller. In the heavily blended and kinematically complex spectra seen toward W49, CF+ absorption primarily traces the peaks of the H2 distribution.

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Journal keyword(s): ISM: molecules

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 3C 111 Sy1 04 18 21.2773655604 +38 01 35.801523843   19.75 18.05     ~ 856 1
2 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 716 0
3 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 445 0
4 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2702 2
5 ICRF J183005.9+061915 QSO 18 30 05.9399600344 +06 19 15.947596681       19.5   ~ 71 1
6 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 437 0
7 W 49n HII 19 10 13.2 +09 06 12           ~ 411 3
8 W 49 SFR 19 10 20 +09 07.7           ~ 508 1
9 ICRF J192559.6+210626 QSO 19 25 59.60535560 +21 06 26.1620442           ~ 177 1
10 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 707 0
11 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2006 1
12 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2505 2

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:37:59

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