J/A+A/582/A64 W51/e2 and G34.3+0.2 IRAM spectra (Lykke+, 2015)
Tentative detection of ethylene glycol toward W51/e2 and G34.3+0.2.
Lykke J.M., Favre C., Bergin E.A., Jorgensen J.K.
<Astron. Astrophys. 582, A64 (2015)>
=2015A&A...582A..64L 2015A&A...582A..64L (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Spectroscopy
Keywords: ISM: molecules - ISM: abundances - ISM: individual objects: W51/e2 -
methods: observational - astrochemistry -
ISM: individual objects: G34.3+0.2
Abstract:
With only a few low- and high-mass star-formation regions studied in
detail so far, it is unclear what role the environment plays in complex
molecule formation. In this light, a comparison of relative abundances
of related species between sources might be useful for explaining any
observed differences.
We seek to measure the relative abundance between three important
complex organic molecules, ethylene glycol ((CH2OH)2),
glycolaldehyde (CH2OHCHO) and methyl formate (HCOOCH3), toward
high-mass protostars and thereby provide additional constraints on
their formation pathways.
We use IRAM30 m single-dish observations of the three species toward
two high-mass star-forming regions - W51/e2 and G34.3+0.2 - and report
a tentative detection of (CH2OH)2 toward both sources.
Description:
Reduced spectra for two high-mass star forming regions: W51/e2 and
G34.3+0.2. The observations were performed with the IRAM 30-m
telescope at Pico Veleta, Spain on December 13 and 14, 2012. The EMIR
receiver was used in dual band polarisation (E090/E230) in connection
with i) the 200kHz Fourier transform spectrometer (FTS) back-end in
the frequency ranges 99.70-106.3GHz and 238.2-246.0GHz for the E090
and E230 bands, respectively; ii) the WILMA back-end in the frequency
ranges 99.88-103.6GHz and 238.4-242.1GHz for the E090 and E230 bands,
respectively. The observations were reduced using The Continuum and
Line Analysis Single-dish Software (CLASS). The resulting FTS spectra
were smoothed to a spectral resolution of 1.15km/s for the E090 band
and 1.22km/s for the E230 band while the WILMA spectra were smoothed
to 5.88km/s and 2.49km/s for the E090 and E230 bands, respectively.
Additional information about the observations and their reduction can
be found in the article.
Objects:
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RA (2000) DE Designation(s)
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18 53 18.54 +01 14 57.9 G34.3+0.2 = GPSR 034.257+0.155
19 23 43.90 +14 30 34.8 W51/e2 = W51 E2
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 143 12 List of spectra
sp/* . 12 Individual fits spectra
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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- 24 I5 --- Nx Number of pixels along X-axis
26- 48 A23 --- Obs.Date Observation date (YYYY-MM-DDThh:mm:ss.sss)
50- 61 E12.6 Hz bFreq Lower value of frequency interval
63- 74 E12.6 Hz BFreq Upper value of frequency interval
75- 81 I7 Hz dFreq Frequency resolution
83- 84 I2 Kibyte size Size of FITS file
86-114 A29 --- FileName Name of FITS file, in subdirectory sp
116-143 A28 --- Title Title of the FITS file
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Acknowledgements:
Julie Maria Lykke, juliemarialykke(at)gmail.com
(End) Patricia Vannier [CDS] 27-Aug-2015