2011A&A...525A.116G


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.27CET01:56:53

2011A&A...525A.116G - Astronomy and Astrophysics, volume 525A, 116-116 (2011/1-1)

The tight correlation of CCH and c-C3H2 in diffuse and translucent clouds.

GERIN M., KAZMIERCZAK M., JASTRZEBSKA M., FALGARONE E., HILY-BLANT P., GODARD B. and DE LUCA M.

Abstract (from CDS):

Using the IRAM 30m telescope we observed molecular absorption lines from CCH and c-C3H2 produced by diffuse and translucent clouds along the lines of sight towards massive star forming regions. The same sources are surveyed with Herschel/HIFI as part of the PRISMAS guaranteed time program, for molecular absorption lines due to hydrides and carbon clusters. The background sources are massive star-forming regions (G34.3+0.1, G10.62-0.39, W51, W49N) and Sgr A*. The line profiles of the CCH and c-C3H2 are strikingly similar for all lines of sight, showing that the ratio of the opacities of the probed transitions, (JKa,Kc=21,2-10,1) for c-C3H2 and (J=1-0, F=5/2-3/2) for CCH, is nearly constant along all lines of sight, at τCCH∼1.8xτc–C3H2. As a consequence, the ratio of the column densities of CCH and c-C3H2 is nearly constant and similar to the value derived earlier for diffuse clouds detected along lines of sight towards extragalactic continuum sources, N(CCH)=(28±1.4) N(c-C3H2) (Lucas & Liszt, 2000A&A...358.1069L). PDR models are able to reproduce the observed CCH column densities for the range of physical conditions appropriate for the absorbing matter (n=100-3000cm–3; AV=1-5mag) but can neither fit the observed c-C3H2 column densities nor the tight correlation between CCH and c-C3H2.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: molecules

Simbad objects: 9

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Number of rows : 9

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 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 435 0
2 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 911 0
3 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3325 3
4 W 31c HII 18 10 29.1 -19 56 05           ~ 301 0
5 SNR G034.3+00.1 SNR 18 53 18 +01 14.8           ~ 18 0
6 W 49n HII 19 10 13.2 +09 06 12           ~ 406 3
7 W 51e1 Rad 19 23 43.77 +14 30 25.9           ~ 112 0
8 W 51e2 Rad 19 23 43.90 +14 30 34.8           ~ 177 0
9 W 51 SNR 19 23 50 +14 06.0           ~ 1127 1

    Equat.    Gal    SGal    Ecl

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2020.01.27-01:56:53

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