2012A&A...546A.103S


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.20CEST22:09:35

2012A&A...546A.103S - Astronomy and Astrophysics, volume 546A, 103-103 (2012/10-1)

CH radio emission from Heiles Cloud 2 as a tracer of molecular cloud evolution.

SAKAI N., MAEZAWA H., SAKAI T., MENTEN K.M. and YAMAMOTO S.

Abstract (from CDS):

A mapping observation of the J=1/2 Λ-type doubling transition (3.3GHz) of CH has been conducted toward Heiles Cloud 2 (HCL2) in the Taurus molecular cloud complex to reveal its molecular cloud-scale distribution. The observations were carried out with the Effelsberg 100m telescope. The CH emission is found to be extended over the whole region of HCL2. It is brighter in the southeastern part, which encloses the TMC-1 cyanopolyyne peak than in the northwestern part. Its distribution extends continuously from the peak of the neutral carbon emission (CI peak) to the TMC-1 ridge, as if it were connecting the distributions of the [CI] and C18O emissions. Since CH is an intermediate in gas-phase chemical reactions from C to CO, its emission should trace the transition region. The above distribution of the CH emission is consistent with this chemical behavior. Since the CH abundance is subject to the chemical evolutionary effect, the CH column density in HCL2 no longer follows a linear correlation wit the H2 column density reported for diffuse and translucent clouds. More importantly, the CH line profile is found to be composed of the narrow and broad components. Although the broad component is dominant around the CI peak, the narrow component appears in the TMC-1 ridge and dense core regions such as L1527 and TMC-1A. This trend seems to reflect a narrowing of the line width during the formation of dense cores. These results suggest that the 3.3GHz CH line is a useful tool for tracing the chemical and physical evolution of molecular clouds.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: individual objects: HCL2 - ISM: individual objects: Taurus - ISM: individual objects: TMC-1 - ISM: molecules

VizieR on-line data: <Available at CDS (J/A+A/546/A103): Data cube available in February 2013>

Simbad objects: 19

goto Full paper

goto View the reference in ADS

Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [DB2002b] G131.28-45.68 MoC 01 15.8 +16 48           ~ 20 0
2 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 978 3
3 IC 1805 OpC 02 32 42 +61 27.0   7.03 6.5     ~ 485 2
4 NAME [BM89] B5 DNe 03 47 38.3 +32 52 43           ~ 221 0
5 LDN 1471 DNe 03 48.0 +32 54           ~ 296 0
6 IRAS 04365+2535 Y*O 04 39 35.19360 +25 41 44.7252           ~ 249 0
7 LDN 1527 DNe 04 39 53 +25 45.0           ~ 535 0
8 IRAS 04368+2557 Y*O 04 39 53.97816 +26 03 09.6804           ~ 248 0
9 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3723 0
10 IRAS 04381+2540 Y*O 04 41 12.67920 +25 46 35.4216           K0-M2 123 1
11 Barnard 220 DNe 04 41 38.8 +26 00 42           ~ 125 0
12 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1430 0
13 NAME Lupus-1A cor 15 42 52.40 -34 07 53.5           ~ 27 0
14 NAME Lupus I Cld 15 43 02.1 -34 09 06           ~ 244 0
15 IRAS 15398-3359 Y*? 15 43 02.21016 -34 09 07.7112       18.38 21.72 ~ 138 0
16 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 706 1
17 MBM 40 MoC 16 10 34 +21 49.3           ~ 67 0
18 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12262 0
19 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 352 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2012A&A...546A.103S and select 'bookmark this link' or equivalent in the popup menu


2021.06.20-22:09:35

© Université de Strasbourg/CNRS

    • Contact