OH zeeman magnetic field detections toward five supernova remnants using the VLA

C. L. Brogan; D. A. Frail; W. M. Goss; T. H. Troland

doi:10.1086/309068

OH zeeman magnetic field detections toward five supernova remnants using the VLA

C. L. Brogan, D. A. Frail, W. M. Goss, T. H. Troland

Physics And Astronomy

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62 Scopus citations

Abstract

We have observed the OH (1720 MHz) line in five galactic SNRs with the VLA to measure their magnetic field strengths using the Zeeman effect. We detected all 12 of the bright (S_v > 200 mJy) OH (1720 MHz) masers previously detected by Frail et al. and Green et al. and measured significant magnetic fields (i.e., > 3 σ) in 10 of them. Assuming that the "thermal" Zeeman equation can be used to estimate \B\ for OH masers, our estimated fields range from 0.2 to 2 mG. These magnetic field strengths are consistent with the hypothesis that ambient molecular cloud magnetic fields are compressed via the SNR shock to the observed values. Magnetic fields of this magnitude exert a considerable influence on the properties of the cloud with the magnetic pressures (10^-7-10^-9 ergs cm^-3) exceeding the pressure in the ISM or even the thermal pressure of the hot gas interior to the remnant. This study brings the number of galactic SNRs with OH (1720 MHz) Zeeman detections to 10.

Original language	English
Pages (from-to)	875-890
Number of pages	16
Journal	Astrophysical Journal
Volume	537
Issue number	2 PART 1
DOIs	https://doi.org/10.1086/309068
State	Published - Jul 10 2000

Keywords

ISM: clouds
Masers
Polarization
Radio lines: ISM

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/309068

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title = "OH zeeman magnetic field detections toward five supernova remnants using the VLA",

abstract = "We have observed the OH (1720 MHz) line in five galactic SNRs with the VLA to measure their magnetic field strengths using the Zeeman effect. We detected all 12 of the bright (Sv > 200 mJy) OH (1720 MHz) masers previously detected by Frail et al. and Green et al. and measured significant magnetic fields (i.e., > 3 σ) in 10 of them. Assuming that the {"}thermal{"} Zeeman equation can be used to estimate \B\ for OH masers, our estimated fields range from 0.2 to 2 mG. These magnetic field strengths are consistent with the hypothesis that ambient molecular cloud magnetic fields are compressed via the SNR shock to the observed values. Magnetic fields of this magnitude exert a considerable influence on the properties of the cloud with the magnetic pressures (10-7-10-9 ergs cm-3) exceeding the pressure in the ISM or even the thermal pressure of the hot gas interior to the remnant. This study brings the number of galactic SNRs with OH (1720 MHz) Zeeman detections to 10.",

keywords = "ISM: clouds, Masers, Polarization, Radio lines: ISM",

author = "Brogan, {C. L.} and Frail, {D. A.} and Goss, {W. M.} and Troland, {T. H.}",

year = "2000",

month = jul,

day = "10",

doi = "10.1086/309068",

language = "English",

volume = "537",

pages = "875--890",

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TY - JOUR

T1 - OH zeeman magnetic field detections toward five supernova remnants using the VLA

AU - Brogan, C. L.

AU - Frail, D. A.

AU - Goss, W. M.

AU - Troland, T. H.

PY - 2000/7/10

Y1 - 2000/7/10

N2 - We have observed the OH (1720 MHz) line in five galactic SNRs with the VLA to measure their magnetic field strengths using the Zeeman effect. We detected all 12 of the bright (Sv > 200 mJy) OH (1720 MHz) masers previously detected by Frail et al. and Green et al. and measured significant magnetic fields (i.e., > 3 σ) in 10 of them. Assuming that the "thermal" Zeeman equation can be used to estimate \B\ for OH masers, our estimated fields range from 0.2 to 2 mG. These magnetic field strengths are consistent with the hypothesis that ambient molecular cloud magnetic fields are compressed via the SNR shock to the observed values. Magnetic fields of this magnitude exert a considerable influence on the properties of the cloud with the magnetic pressures (10-7-10-9 ergs cm-3) exceeding the pressure in the ISM or even the thermal pressure of the hot gas interior to the remnant. This study brings the number of galactic SNRs with OH (1720 MHz) Zeeman detections to 10.

AB - We have observed the OH (1720 MHz) line in five galactic SNRs with the VLA to measure their magnetic field strengths using the Zeeman effect. We detected all 12 of the bright (Sv > 200 mJy) OH (1720 MHz) masers previously detected by Frail et al. and Green et al. and measured significant magnetic fields (i.e., > 3 σ) in 10 of them. Assuming that the "thermal" Zeeman equation can be used to estimate \B\ for OH masers, our estimated fields range from 0.2 to 2 mG. These magnetic field strengths are consistent with the hypothesis that ambient molecular cloud magnetic fields are compressed via the SNR shock to the observed values. Magnetic fields of this magnitude exert a considerable influence on the properties of the cloud with the magnetic pressures (10-7-10-9 ergs cm-3) exceeding the pressure in the ISM or even the thermal pressure of the hot gas interior to the remnant. This study brings the number of galactic SNRs with OH (1720 MHz) Zeeman detections to 10.

KW - ISM: clouds

KW - Masers

KW - Polarization

KW - Radio lines: ISM

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U2 - 10.1086/309068

DO - 10.1086/309068

M3 - Article

AN - SCOPUS:0034416028

SN - 0004-637X

VL - 537

SP - 875

EP - 890

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 1

ER -

OH zeeman magnetic field detections toward five supernova remnants using the VLA

Abstract

Keywords

ASJC Scopus subject areas

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