2008A&A...486..493L


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET18:47:48

2008A&A...486..493L - Astronomy and Astrophysics, volume 486, 493-496 (2008/8-1)

Limits on chemical complexity in diffuse clouds: search for CH3 and HC5N absorption.

LISZT H.S., PETY J. and LUCAS R.

Abstract (from CDS):

An unexpectedly complex polyatomic chemistry exists in diffuse clouds, allowing detection of species such as C2H, C3H2, H2CO, and NH3, which have relative abundances that are strikingly similar to those inferred toward the dark cloud TMC-1. We probe the limits of complexity of diffuse cloud polyatomic chemistry. We used the IRAM Plateau de Bure Interferometer to search for galactic absorption from low-lying J=2-1 rotational transitions of A- and E-CH3OH near 96.740GHz and used the VLA to search for the J=8-7 transition of HC5N at 21.3GHz. Neither CH3OH nor HC5N were detected at column densities well below those of all polyatomics known in diffuse clouds and somewhat below the levels expected from comparison with TMC-1. The HCN/HC5N ratio is at least 3-10 times higher in diffuse gas than toward TMC-1.

Abstract Copyright:

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

Errata: erratum vol. 594, art. C1 (2016)

CDS comments: Paragraph 4.1 B0415+479 is a misprint for B0415+379.

Simbad objects: 7

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Number of rows : 7

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 6C 021252+733537 BLL 02 17 30.8143057005 +73 49 32.612359669     19.0 18.97   ~ 400 1
2 4C 50.11 QSO 03 59 29.74726473 +50 57 50.1615765           ~ 388 1
3 3C 111 Sy1 04 18 21.2773655604 +38 01 35.801523843   19.75 18.05     ~ 841 1
4 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1327 0
5 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1707 2
6 EM* MWC 349 Em* 20 32 45.6328 +40 39 36.143   15.88 13.15 12.13   Bep 690 1
7 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 1975 1

    Equat.    Gal    SGal    Ecl

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2019.11.14-18:47:48

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