2018ApJ...856..151L


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.08CET08:48:12

2018ApJ...856..151L - Astrophys. J., 856, 151-151 (2018/April-1)

Chemical complexity in local diffuse and translucent clouds: ubiquitous linear C3H and CH3CN, a detection of HC3N and an upper limit on the abundance of CH2CN.

LISZT H., GERIN M., BEASLEY A. and PETY J.

Abstract (from CDS):

We present Jansky Very Large Array observations of 20-37 GHz absorption lines from nearby Galactic diffuse molecular gas seen against four cosmologically distant compact radio continuum sources. The main new observational results are that l-C3H and CH3CN are ubiqitous in the local diffuse molecular interstellar medium at AV ≲ 1, while HC3N was seen only toward B0415 at AV > 4 mag. The linear/cyclic ratio is much larger in C3H than in C3H2 and the ratio CH3CN/HCN is enhanced compared to TMC-1, although not as much as toward the Horsehead Nebula. More consequentially, this work completes a long-term program assessing the abundances of small hydrocarbons (CH, C2H, linear and cyclic C3H and C3H2, and C4H and C4H) and the CN-bearing species (CN, HCN, HNC, HC3N, HC5N, and CH3CN): their systematics in diffuse molecular gas are presented in detail here. We also observed but did not strongly constrain the abundances of a few oxygen-bearing species, most prominently HNCO. We set limits on the column density of CH2CN, such that the anion CH2CN is only viable as a carrier of diffuse interstellar bands if the N(CH2CN)/N(CH2CN) abundance ratio is much smaller in this species than in any others for which the anion has been observed. We argue that complex organic molecules (COMS) are not present in clouds meeting a reasonable definition of diffuse molecular gas, i.e., AV ≲ 1 mag.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: abundances - ISM: clouds - 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 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3467 3
2 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 150 0
3 4C 50.11 QSO 03 59 29.74726473 +50 57 50.1615765           ~ 388 1
4 3C 111 Sy1 04 18 21.2773655604 +38 01 35.801523843   19.75 18.05     ~ 841 1
5 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3333 0
6 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1330 0
7 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 693 0
8 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 432 0
9 IRC +10216 C* 09 47 57.406 +13 16 43.56     10.96     C9,5e 2109 0
10 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1453 1
11 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11077 0
12 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1860 1
13 [MBS2007c] CygX-N44 Rad 20 39 01.01 +42 22 50.2           ~ 356 0
14 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 1976 1
15 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2446 2
16 NAME Scutum Spiral Arm PoG ~ ~           ~ 256 0

    Equat.    Gal    SGal    Ecl

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2019.12.08-08:48:12

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