J/A+A/532/A23 TIMASSS. I. IRAS 16293-2422 spectra (Caux+, 2011)
TIMASSS: the IRAS 16293-2422 millimeter and submillimeter spectral survey.
I. Observations, calibration, and analysis of the line kinematics.
Caux E., Kahane C., Castets A., Coutens A., Ceccarelli C., Bacmann A.,
Bisschop S., Bottinelli S., Comito C., Helmich F.P., Lefloch B., Parise B.,
Schilke P., Tielens A.G.G.M., Van Dishoeck E., Vastel C., Wakelam V.,
Walters A.
<Astron. Astrophys., 532, A23 (2011)>
=2011A&A...532A..23C 2011A&A...532A..23C (SIMBAD/NED BibCode)
ADC_Keywords: Infrared sources ; Spectra, infrared
Keywords: stars: protostars - molecular data - line: identification -
astrochemistry
Abstract:
Unbiased spectral surveys are powerful tools to study the chemistry
and the physics of star forming regions, because they can provide a
complete census of the molecular content and the observed lines probe
the physical structure of the source.
While unbiased surveys at the millimeter and sub-millimeter
wavelengths observable from ground-based telescopes have previously
been performed towards several high mass protostars, very little
exists on low mass protostars, which are believed to resemble our own
Sun's progenitor. To help fill up this gap in our understanding, we
carried out a complete spectral survey of the bands at 3, 2, 1, and
0.9mm towards the solar type protostar IRAS 16293-2422.
The observations covered a range of about 200GHz and were obtained
with the IRAM-30m and JCMT-15m telescopes during about 300h of
observations. Particular attention was devoted to the
inter-calibration of the acquired spectra with previous observations.
All the lines detected with more than 3-sigma confidence-interval
certainty and free from obvious blending effects were fitted with
Gaussians to estimate their basic kinematic properties.
More than 4000 lines were detected (with sigma≥3) and identified,
yielding a line density of approximatively 20 lines per GHz,
comparable to previous surveys in massive hot cores. The vast majority
(about two-thirds) of the lines are weak and produced by complex
organic molecules. The analysis of the profiles of more than 1000
lines belonging to 70 species firmly establishes the presence of two
distinct velocity components associated with he two objects, A and B,
forming the IRAS 16293-2422 binary system. In the source A, the line
widths of several species increase with the upper level energy of the
transition, a behavior compatible with gas infalling towards a
∼1M☉ object. The source B, which does not show this effect,
might have a much lower central mass of ∼0.1M☉. The difference
in the rest velocities of both objects is consistent with the
hypothesis that the source B rotates around he source A. Conclusions.
This spectral survey, although obtained with single-dish telescopes at
a low spatial resolution, allows us to separate the emission from two
different components, thanks to the large number of lines detected.
Description:
We provide the fully reduced and concatenated observations into a single
spectrum per observatory. The spectra are provided as fits 'BINTABLE'.
The intensities are in T_A* ; the covered frequency ranges are :
- IRAM-30m : 80-115.5 GHz ; 129-177.5 GHz ; 198-281.5 GHz
- JCMT-15m : 328-366 GHz
For the IRAM-30m, the spectrum was produced using only the
1MHz-FilterBanks backend.
TIMASSS_IRAM.fits:
BINTABLE containing the spectrum of IRAS 16293-2422 observed with the
IRAM-30m telescope over the frequency ranges 80-115.5GHz; 129-177.5GHz;
198-281.5 GHz. Intensities are in TA* [K].
TIMASSS_JCMT.fits:
BINTABLE containing the spectrum of IRAS 16293-2422 observed with the
JCMT over the frequency range 328-366 GHz. Intensities are in TA* [K].
Objects:
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RA (2000) DE Designation(s)
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16 32 22.56 -24 28 31.8 IRAS 16293-2422 = WISE J163222.62-242833.6
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 120 2 List of fits spectra
fits/* . 2 Individual fits spectra
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
12 A1 --- DE- Declination sign (J2000)
13- 14 I2 deg DEd Declination (J2000)
16- 17 I2 arcmin DEm Declination (J2000)
19- 22 F4.1 arcsec DEs Declination (J2000)
24- 25 I2 --- Nx Number of pixels along X-axis
27- 32 I6 --- Ny Number of pixels along Y-axis
34- 37 I4 Kibyte size Size of FITS file
39- 55 A17 --- FileName Name of FITS file, in subdirectory fits
57-120 A64 --- Title Title of the FITS file
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Acknowledgements:
From Sandrine Bottinelli. sandrine.bottinelli(at)utoulouse.fr
The fits files were generated from GILDAS/CLASS files with the CASSIS
software and the headers were further edited with Python by S. Bottinelli.
References:
https://cassis.irap.omp.eu
https://www.iram.fr/IRAMFR/GILDAS/
(End) S. Bottinelli [IRAP, Toulouse, France], P. Vannier [CDS] 07-Dec-2025