Detection of the 23–22 emission line of sulphur monoxide and its relevance to magnetic fields in Orion

Ronald Brown; Peter Godfrey; David Winkler

doi:10.1093/mnras/190.1.1

Detection of the 2₃–2₂ emission line of sulphur monoxide and its relevance to magnetic fields in Orion

Ronald Brown, Peter Godfrey, David Winkler

School of Chemistry

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Abstract

We have observed the 23–22 transition of SO at 36 201.942 MHz in Orion A with ∆Ta = 0.4 K and ∆v = 23 km/s. From an analysis of the Zeeman effect on this line we deduce that, contrary to the proposal of Clark & Johnson that a magnetic field of 6 gauss is broadening the observed SO lines, the field cannot be greater than 1 gauss. Other considerations make it more plausible that the observed line broadenings are attributable to kinematic effects of expanding or collapsing gas shells and that the magnetic field in the Orion molecular cloud is considerably weaker than 1 gauss.

Original language	English
Pages (from-to)	1-6
Number of pages	6
Journal	Monthly Notices of the Royal Astronomical Society
Volume	190
Issue number	1
DOIs	https://doi.org/10.1093/mnras/190.1.1
Publication status	Published - 1980

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10.1093/mnras/190.1.1

Cite this

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title = "Detection of the 23–22 emission line of sulphur monoxide and its relevance to magnetic fields in Orion",

abstract = "We have observed the 23–22 transition of SO at 36 201.942 MHz in Orion A with ∆Ta = 0.4 K and ∆v = 23 km/s. From an analysis of the Zeeman effect on this line we deduce that, contrary to the proposal of Clark & Johnson that a magnetic field of 6 gauss is broadening the observed SO lines, the field cannot be greater than 1 gauss. Other considerations make it more plausible that the observed line broadenings are attributable to kinematic effects of expanding or collapsing gas shells and that the magnetic field in the Orion molecular cloud is considerably weaker than 1 gauss.",

author = "Ronald Brown and Peter Godfrey and David Winkler",

year = "1980",

doi = "10.1093/mnras/190.1.1",

language = "English",

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T1 - Detection of the 23–22 emission line of sulphur monoxide and its relevance to magnetic fields in Orion

AU - Brown, Ronald

AU - Godfrey, Peter

AU - Winkler, David

PY - 1980

Y1 - 1980

N2 - We have observed the 23–22 transition of SO at 36 201.942 MHz in Orion A with ∆Ta = 0.4 K and ∆v = 23 km/s. From an analysis of the Zeeman effect on this line we deduce that, contrary to the proposal of Clark & Johnson that a magnetic field of 6 gauss is broadening the observed SO lines, the field cannot be greater than 1 gauss. Other considerations make it more plausible that the observed line broadenings are attributable to kinematic effects of expanding or collapsing gas shells and that the magnetic field in the Orion molecular cloud is considerably weaker than 1 gauss.

AB - We have observed the 23–22 transition of SO at 36 201.942 MHz in Orion A with ∆Ta = 0.4 K and ∆v = 23 km/s. From an analysis of the Zeeman effect on this line we deduce that, contrary to the proposal of Clark & Johnson that a magnetic field of 6 gauss is broadening the observed SO lines, the field cannot be greater than 1 gauss. Other considerations make it more plausible that the observed line broadenings are attributable to kinematic effects of expanding or collapsing gas shells and that the magnetic field in the Orion molecular cloud is considerably weaker than 1 gauss.

U2 - 10.1093/mnras/190.1.1

DO - 10.1093/mnras/190.1.1

M3 - Article

VL - 190

SP - 1

EP - 6

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -