J/A+A/559/A47 Sgr B2(N) and Sgr B2(M) IRAM 30m line survey (Belloche+, 2013)
Complex organic molecules in the interstellar medium: IRAM 30m line survey of
Sagittarius B2(N) and (M).
Belloche A., Mueller H.S.P., Menten K.M., Schilke P., Comito C.
<Astron. Astrophys. 559, A47 (2013)>
=2013A&A...559A..47B 2013A&A...559A..47B
ADC_Keywords: Supernova remnants ; Spectroscopy
Keywords: astrobiology - astrochemistry - line: identification -
stars: formation - ISM: individual objects: Sagittarius B2 -
ISM: molecules
Abstract:
The discovery of amino acids in meteorites fallen to Earth and the
detection of glycine, the simplest of them, in samples returned from a
comet to Earth strongly suggest that the chemistry of the interstellar
medium is capable of producing such complex organic molecules and that
they may be widespread in our Galaxy.
Our goal is to investigate the degree of chemical complexity that can
be reached in the interstellar medium, in particular in dense
star-forming regions.
We performed an unbiased, spectral line survey toward Sgr B2(N) and
(M), two regions where high-mass stars are formed, with the IRAM 30m
telescope in the 3mm atmospheric transmission window. Partial surveys
at 2 and 1.3mm were performed in parallel. The spectra were analyzed
with a simple radiative transfer model that assumes local
thermodynamic equilibrium but takes optical depth effects into
account.
Description:
The list of line identifications corresponding to the blue labels in
Figs. 2 to 7 where the labels are often too crowded to be easily
readable are available in ASCII format. The lists are split into six
files, three for Sgr B2(N) and three for Sgr B2(M). For each source,
there is one file per atmospheric window (3, 2, and 1mm). Each file is
ordered by increasing frequency.
The observed and synthetic spectra of Sgr B2(N) and Sgr B2(M) between
80 and 116GHz are available both in ASCII and FITS formats. The
synthetic spectra were resampled to the same frequency channels as the
observed spectra. The blanking value is -1000K for the ASCII files.
There is one ASCII file per source.
There are two FITS files per source, one for the observed spectrum and
one for the synthetic spectrum. The intensities are in main-beam
temperature scale in K. The blanking value is 42.75234K for the
observed spectrum of SgrB2(N) and 53.96533K for the observed spectrum
of SgrB2(M).
Objects:
--------------------------------------------------------
RA (2000) DE Designation(s)
--------------------------------------------------------
17 47 20.2 -28 22 21 SgrB2(N) = NAME SGR B2 (NORTH)
17 47 20.5 -28 23 06 SgrB2(M) = NAME SGR B2 MAIN
--------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
b2n_ids1.dat 96 5695 List of line identifications at 1mm for Sgr B2(N)
b2n_ids2.dat 96 714 List of line identifications at 2mm for Sgr B2(N)
b2n_ids3.dat 96 7674 List of line identifications at 3mm for Sgr B2(N)
b2n_spec.dat 42 115185 Observed and synthetic 3-mm spectra of Sgr B2(N)
b2m_ids1.dat 96 2098 List of line identifications at 1mm for Sgr B2(M)
b2m_ids2.dat 96 115 List of line identifications at 2mm for Sgr B2(M)
b2m_ids3.dat 96 1768 List of line identifications at 3mm for Sgr B2(M)
b2m_spec.dat 42 115185 Observed and synthetic 3-mm spectra of Sgr B2(M)
fits/* . 4 FITS spectra
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See also:
J/ApJS/117/427 : Sgr B2 spectral survey (Nummelin+, 1998)
J/ApJS/158/188 : Detection of glycolaldehyde toward Sgr B2 (Widicus+, 2005)
J/A+A/482/179 : Interferometric study of SgrB2(N) (Belloche+, 2008)
Byte-by-byte Description of file: b2n_ids?.dat b2m_ids?.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 21 A21 --- El Molecule (plus vibrational or torsional state
in some cases)
22- 34 A13 --- qNu Quantum numbers (lower level)
36 A1 --- --- [-]
38- 50 A13 --- qNl Quantum numbers (lower level)
61- 70 F10.3 MHz Freq Frequency
73- 78 F6.3 MHz e_Freq Frequency uncertainty
81- 87 F7.2 K Elow Lower energy level
89- 96 F8.3 D2 mu2S Line strength (µ2S) in D2
--------------------------------------------------------------------------------
Byte-by-byte Description of file: b2m_spec.dat b2n_spec.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.5 MHz RFreq Rest frequency
15- 27 F13.7 K T(MB) ?=-1000 Observed intensity in main-beam
temperature scale
33- 42 F10.7 K T(MB)M Modeled intensity in main-beam temperature scale
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Acknowledgements:
Arnaud Belloche, belloche(at)mpifr-bonn.mpg.de
(End) Patricia Vannier [CDS] 19-Aug-2013