2003A&A...403L..43C


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.23CET15:07:10

2003A&A...403L..43C - Astronomy and Astrophysics, volume 403, L43-46 (2003/6-1)

Widespread acetaldehyde near the Galactic Centre.

CHENGALUR J.N. and KANEKAR N.

Abstract (from CDS):

We present Giant Meterwave Radio Telescope images of the 1065-MHz emission from the 111->110 rotational transition of acetaldehyde (CH3CHO) in the molecular cloud complex Sgr B2. Our observations are unique in that they have a high spatial resolution (∼4''), while still being sensitive to large-scale emission. Most complex organic molecules in this cloud (e.g. acetone, methyl formate, acetic acid) are concentrated in a very small core, ∼0.1pc across. In contrast, acetaldehyde is found to be spread over a region at least 100 times larger in extent. The line emission is confined to regions with radio continuum emission and correlates well (in both position and velocity) with formaldehyde absorption towards this continuum; this is consistent with earlier single dish results suggesting that it is likely to be weakly mased. Our observations also suggest that grain mantle destruction by shocks plays an important role in the observed gas phase abundance of CH3CHO in Sgr B2.

Abstract Copyright:

Journal keyword(s): Galaxy: centre - ISM: clouds - ISM: molecules - astrochemistry - radio lines: ISM

CDS comments: Compact source '1751-253' could be PMN J1751-2521 ?

Simbad objects: 10

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Number of rows : 10

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 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2462 2
2 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3660 1
3 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11251 0
4 NAME Sgr B2 HII AA HII 17 47 19.4 -28 24 40           ~ 6 0
5 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 504 1
6 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1879 1
7 NAME Sgr B2 (South) HII 17 47 20.430 -28 23 45.06           ~ 84 0
8 NAME Large Molecule Heimat MoC 17 47 20.4943 -28 22 11.656           ~ 109 0
9 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 327 1
10 PMN J1751-2521 Rad 17 51 13 -25 21.6           ~ 13 0

    Equat.    Gal    SGal    Ecl

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2020.02.23-15:07:10

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