J/A+A/560/A73 Horsehead H2CO and CH3OH 30m and PdBI maps (Guzman+, 2013)
The IRAM-30m line survey of the Horsehead PDR:
IV. Comparative chemistry of H2CO and CH3OH.
Guzman V., Goicoechea J.R., Pety J., Gratier P., Gerin M., Roueff E.,
Le Petit F., Le Bourlot J., Faure A.
<Astron. Astrophys. 560, A73 (2013)>
=2013A&A...560A..73G 2013A&A...560A..73G
ADC_Keywords: Molecular clouds ; Radio lines
Keywords: astrochemistry - ISM: clouds - ISM: molecules -
photon-dominated region (PDR) - radiative transfer - radio lines: ISM
Abstract:
Theoretical models and laboratory experiments show that CH3OH is
efficiently formed on cold grain surfaces through the successive
hydrogenation of CO, forming HCO and H2CO as intermediate species.
In cold cores and low UV-field illumination photo-dissociation regions
(PDRs) the ices can be released into the gas-phase through nonthermal
processes such as photodesorption, which considerably increases their
gas-phase abundances.
We investigate the dominant formation mechanism of H2CO and CH3OH
in the Horsehead PDR and its associated dense core.
Description:
Integrated intensity maps of one H2CO line (145.603GHz) and two
CH3OH lines (145.097 and 145.103GHz) in the Horsehead nebula. The
single dish maps observed with the IRAM-30m telescope are included
(17.9"x17.9" angular resolution), as well as high-angular resolution
(6.1"x5.6") maps observed with the IRAM-PdBI. The single-dish map
from the IRAM-30m were used to create the short-spacing visibilities
not sampled by the Plateau de Bure interferometer.
Objects:
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RA (2000) DE Designation(s)
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05 40 59.0 -02 27 30 Horsehead = Barnard 33
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 106 6 List of FITS maps
maps/* . 6 Individual FITS maps
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See also:
B/iram : IRAM Observation Logs (IRAM 1991-2014)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 F4.2 arcsec/pix Scale [0.49/4] Scale of the image
25- 27 I3 pix Nx Number of pixels along X-axis
28 A1 --- --- [x]
29- 31 I3 pix Ny Number of pixels along Y-axis
33- 37 F5.2 km/s Vel Velocity
41- 52 A12 --- FileName Name of FITS file in subdirectory maps
54-106 A53 --- Title Title of the file
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Acknowledgements:
Viviana Guzman, guzman(at)iram.fr
References:
Guzman et al., Paper I 2012A&A...543L...1G 2012A&A...543L...1G
Pety et al., Paper II 2012A&A...548A..68P 2012A&A...548A..68P
(End) Patricia Vannier [CDS] 23-Oct-2013