2017MNRAS.470.4075L


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.23CET08:38:18

2017MNRAS.470.4075L - Mon. Not. R. Astron. Soc., 470, 4075-4088 (2017/October-1)

The interstellar chemistry of C3H and C3H2 isomers.

LOISON J.-C., AGUNDEZ M., WAKELAM V., ROUEFF E., GRATIER P., MARCELINO N., REYES D.N., CERNICHARO J. and GERIN M.

Abstract (from CDS):

We report the detection of linear and cyclic isomers of C3H and C3H2 towards various starless cores and review the corresponding chemical pathways involving neutral (C3Hx with x = 1,2) and ionic (C3Hx+ with x = 1,2,3) isomers. We highlight the role of the branching ratio of electronic dissociative recombination (DR) reactions of C3H2+ and C3H3+ isomers, showing that the statistical treatment of the relaxation of C3H* and C3H2* produced in these DR reactions may explain the relative c,l-C3H and c,l-C3H2 abundances. We have also introduced in the model the third isomer of C3H2 (HCCCH). The observed cyclic-to-linear C3H2 ratio varies from 110 ± 30 for molecular clouds with a total density of about 1 x 104 molecules cm–3 to 30 ± 10 for molecular clouds with a total density of about 4 x 105 molecules cm–3, a trend well reproduced with our updated model. The higher ratio for molecular clouds with low densities is determined mainly by the importance of the H + l-C3H2 - H + c-C3H2 and H + t-C3H2 - H + c-C3H2 isomerization reactions.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

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

Simbad objects: 16

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Number of rows : 16

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 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 152 0
2 LDN 1389 MoC 04 04 38 +56 56.2           ~ 78 0
3 LDN 1495B DNe 04 15 36.5 +28 46 06           ~ 41 0
4 LDN 1521F DNe 04 28 39.3 +26 51 43           ~ 179 1
5 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1337 0
6 LDN 1512 MoC 05 04 09.7 +32 43 09           ~ 159 0
7 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 702 0
8 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 437 0
9 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2115 0
10 NAME Lupus-1A cor 15 42 52.40 -34 07 53.5           ~ 25 0
11 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 504 1
12 LDN 483 DNe 18 17 35 -04 39.8           ~ 199 0
13 NAME Serpens South 1a cor 18 29 57.90 -01 56 19.0           ~ 11 0
14 NAME Serpens South molecular cloud MoC 18 30 -02.0           ~ 49 0
15 LDN 1172 DNe 21 02 27.7 +67 54 08           ~ 46 0
16 LDN 1251A DNe 22 30 31.8 +75 14 17           ~ 70 2

    Equat.    Gal    SGal    Ecl

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2020.02.23-08:38:18

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