J/A+A/605/A20 Zeeman effect in sulfur monoxide (SO) (Cazzoli+, 2017)
Zeeman effect in sulfur monoxide. A tool to probe magnetic fields in star
forming regions.
Cazzoli G., Lattanzi V., Coriani S., Gauss J., Codella C., Asensio Ramos A.,
Cernicharo J., Puzzarini C.
<Astron. Astrophys. 605, A20 (2017)>
=2017A&A...605A..20C 2017A&A...605A..20C (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: ISM: molecules - molecular data - methods: data analysis -
methods: laboratory: molecular - magnetic fields
Abstract:
Magnetic fields play a fundamental role in star formation processes
and the best method to evaluate their intensity is to measure the
Zeeman effect of atomic and molecular lines. However, a direct
measurement of the Zeeman spectral pattern from interstellar molecular
species is challenging due to the high sensitivity and high spectral
resolution required. So far, the Zeeman effect has been detected
unambiguously in star forming regions for very few non-masing species,
such as OH and CN.
We decided to investigate the suitability of sulfur monoxide (SO),
which is one of the most abundant species in star forming regions, for
probing the intensity of magnetic fields via the Zeeman effect.
We investigated the Zeeman effect for several rotational transitions
of SO in the (sub-)mm spectral regions by using a frequency-modulated,
computer-controlled spectrometer, and by applying a magnetic field
parallel to the radiation propagation (i.e., perpendicular to the
oscillating magnetic field of the radiation). To support the
experimental determination of the g factors of SO, a systematic
quantum-chemical investigation of these parameters for both SO and
O2 has been carried out.
Description:
The complete list of measured Zeeman components of sulfur monoxide
(SO).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
zeecomp.dat 71 360 Sulfur Monoxide: Zeeman spectra
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See also:
J/A+A/531/A103 : Collisional excitation of sulfur dioxide (Cernicharo+, 2011)
J/ApJ/799/115 : Absorption spectrum of SO up to 2.5THz (Martin-Drumel+ 2015)
J/MNRAS/459/3890 : ExoMol line lists for SO2 (Underwood+, 2016)
Byte-by-byte Description of file: zeecomp.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- N0 Lower level rotational angular momentum, N'
5- 6 I2 --- J0 Lower level total angular momentum, J'
8- 10 I3 --- M0J Lower level rotational level, M'J
12- 13 I2 --- N1 Upper level rotational angular momentum, N"
16- 17 I2 --- J1 Upper level total angular momentum, J"
20- 21 I2 --- M1J Upper level rotational level, M"J
23- 34 F12.5 MHz Freq Frequency
36- 42 F7.5 MHz e_Freq rms uncertainty on Freq
44- 52 F9.5 --- Int Intensity (in arbitrary unit)
54- 61 F8.5 A Current Current (in Ampere)
63- 71 F9.5 gauss B ? Magnetic field
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Acknowledgements:
Cristina Puzzarini, cristina.puzzarini(at)unibo.it
(End) Patricia Vannier [CDS] 15-May-2017