2013A&A...552A.122B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST17:10:47

2013A&A...552A.122B - Astronomy and Astrophysics, volume 552A, 122-122 (2013/4-1)

Dimethyl ether in its ground state, V = 0, and lowest two torsionally excited states, v11 = 1 and v15 = 1, in the high-mass star-forming region G327.3-0.6.

BISSCHOP S.E., SCHILKE P., WYROWSKI F., BELLOCHE A., BRINCH C., ENDRES C.P., GUESTEN R., HAFOK H., HEYMINCK S., JORGENSEN J.K., MUELLER H.S.P., MENTEN K.M., ROLFFS R. and SCHLEMMER S.

Abstract (from CDS):

One of the big questions in astrochemistry is whether complex organic molecules are formed in the gas phase after evaporation of the icy mantles of interstellar dust grains or at intermediate temperatures within these icy mantles. Dimethyl ether (CH3OCH3) is one of these species that may form through either of these mechanisms, but it is yet unclear which is dominant. The goal of this paper is to determine the respective importance of solid state vs. gas phase reactions for the formation of dimethyl ether. This is done by a detailed analysis of the excitation properties of the ground state and the torsionally excited states, v11=1 and v15=1, toward the high-mass star-forming region G327.3-0.6. With the Atacama Pathfinder EXperiment 12m submillimeter telescope, we performed a spectral line survey toward G327.3-0.6 around 1.3, 1.0, and 0.9mm as well as at 0.43 and 0.37mm. The observed CH3OCH3 spectrum is modeled assuming local thermal equilibrium. CH3OCH3 has been detected in the ground state, v=0, and in the torsionally excited states v11=1 and v15=1, for which lines have been detected here for the first time. The emission is modeled with an isothermal source structure as well as with a non-uniform spherical structure. In the isothermal case two components at 80 and 100K are needed to reproduce the dimethyl ether emission, whereas an abundance jump at 85K or a model with two abundance jumps at 70 and 100K fit the emission equally well for the non-uniform source model. The emission from the torsionally excited states, v11=1 and v15=1, is very well fit by the same model as the ground state. For non-uniform source models one abundance jump for dimethyl ether is sufficient to fit the emission, but two components are needed for the isothermal models. This suggests that dimethyl ether is present in an extended region of the envelope and traces a non-uniform density and temperature structure. Both types of models furthermore suggest that most dimethyl ether is present in gas that is warmer than 100K, but a smaller fraction of 5%-28% is present at temperatures between 70 and 100K. The dimethyl ether present in this cooler gas is likely formed in the solid state, while gas phase formation probably is dominant above 100K. Finally, the v11=1 and v15=1 torsionally excited states are easily excited under the density and temperature conditions in G327.3-0.6 and will thus very likely be detectable in other hot cores as well.

Abstract Copyright:

Journal keyword(s): astrochemistry - line: identification - methods: observational - stars: formation - ISM: abundances - ISM: molecules

Simbad objects: 1

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Number of rows : 1

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 GAL 327.30-00.60 HII 15 53 05.0 -54 35 24           ~ 119 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST17:10:47

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
GAL 327.30-00.60 -- HII (ionized) region
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
HII (RCW,[HBB99],...), Rad (GRS,[GS70]), IR (IRAS)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
15 53 05.0 -54 35 24 [ ] D 1999ApJ...517..282H
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
15 49 11.9 -54 26 30 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
327.3042 -00.5515 [ ]
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) -45 [~] / z(~) -0.000150 [~] / cz -45.00 [~]
   D ~
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Identifiers (10) :
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GAL 327.30-00.60 GRS G327.30 -00.60 [GS70] 327.3-00.5 [WMG70] 327.3-00.5
GAL 327.3-00.6 IRAS 15492-5426 [HBB99] 327.304-0.552
GRS G327.30 -00.50 RCW 97 [KC97c] G327.3-00.6

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References (119 between 1850 and 2019) (Total 119)
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herschel : 24   

   


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Data at NED - NASA/IPAC Extragalactic Database : GAL 327.30-00.60

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IRAS 15492-5426

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2019.10.22-17:10:47

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