Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations

K. L. Thompson; T. H. Troland; R. L. Plante

doi:10.3847/1538-4357/ada292

Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations

K. L. Thompson
, T. H. Troland
, R. L. Plante

Physics And Astronomy

Producción científica: Article › revisión exhaustiva

Resumen

Very Large Array (VLA) observations of 18 cm OH absorption lines were used to determine the strength of the line-of-sight magnetic field in the Galactic center region. This study is an extension of the VLA OH Zeeman observations of Killeen et al. with fourfold the on-source integration time and twice the sensitivity to the Zeeman effect. The new data fail to confirm the 7σ Zeeman detections of 2 mG fields reported in the earlier work. Also, we cannot reproduce these reported detections from our own analysis of archival data of the earlier work. We find no certain detections of the OH Zeeman effect in the Galactic center region. Our results suggest magnetic fields of no more than about a milligauss in the sampled regions.

Idioma original	English
Número de artículo	78
Publicación	Astrophysical Journal
Volumen	980
N.º	1
DOI	https://doi.org/10.3847/1538-4357/ada292
Estado	Published - feb 10 2025

Nota bibliográfica

Publisher Copyright:
© 2025. The Author(s). Published by the American Astronomical Society.

Financiación

We thank Richard Crutcher for useful discussions regarding this manuscript and Doug Roberts for his help in obtaining the VLA data used in this work. We are also grateful for thoughtful and thorough review of this work by the referee. This work was supported in part by the National Science Foundation under NSF grant AST 0908841.

Financiadores	Número del financiador
National Science Foundation Arctic Social Science Program	AST 0908841

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Acceder al documento

10.3847/1538-4357/ada292

Otros archivos y enlaces

Citar esto

@article{48f172fc8b204d6282ecee4c4df461e5,

title = "Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations",

abstract = "Very Large Array (VLA) observations of 18 cm OH absorption lines were used to determine the strength of the line-of-sight magnetic field in the Galactic center region. This study is an extension of the VLA OH Zeeman observations of Killeen et al. with fourfold the on-source integration time and twice the sensitivity to the Zeeman effect. The new data fail to confirm the 7σ Zeeman detections of 2 mG fields reported in the earlier work. Also, we cannot reproduce these reported detections from our own analysis of archival data of the earlier work. We find no certain detections of the OH Zeeman effect in the Galactic center region. Our results suggest magnetic fields of no more than about a milligauss in the sampled regions.",

author = "Thompson, \{K. L.\} and Troland, \{T. H.\} and Plante, \{R. L.\}",

note = "Publisher Copyright: {\textcopyright} 2025. The Author(s). Published by the American Astronomical Society.",

year = "2025",

month = feb,

day = "10",

doi = "10.3847/1538-4357/ada292",

language = "English",

volume = "980",

number = "1",

}

TY - JOUR

T1 - Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations

AU - Thompson, K. L.

AU - Troland, T. H.

AU - Plante, R. L.

PY - 2025/2/10

Y1 - 2025/2/10

N2 - Very Large Array (VLA) observations of 18 cm OH absorption lines were used to determine the strength of the line-of-sight magnetic field in the Galactic center region. This study is an extension of the VLA OH Zeeman observations of Killeen et al. with fourfold the on-source integration time and twice the sensitivity to the Zeeman effect. The new data fail to confirm the 7σ Zeeman detections of 2 mG fields reported in the earlier work. Also, we cannot reproduce these reported detections from our own analysis of archival data of the earlier work. We find no certain detections of the OH Zeeman effect in the Galactic center region. Our results suggest magnetic fields of no more than about a milligauss in the sampled regions.

AB - Very Large Array (VLA) observations of 18 cm OH absorption lines were used to determine the strength of the line-of-sight magnetic field in the Galactic center region. This study is an extension of the VLA OH Zeeman observations of Killeen et al. with fourfold the on-source integration time and twice the sensitivity to the Zeeman effect. The new data fail to confirm the 7σ Zeeman detections of 2 mG fields reported in the earlier work. Also, we cannot reproduce these reported detections from our own analysis of archival data of the earlier work. We find no certain detections of the OH Zeeman effect in the Galactic center region. Our results suggest magnetic fields of no more than about a milligauss in the sampled regions.

UR - https://www.scopus.com/pages/publications/85217237562

UR - https://www.scopus.com/pages/publications/85217237562#tab=citedBy

U2 - 10.3847/1538-4357/ada292

DO - 10.3847/1538-4357/ada292

M3 - Article

AN - SCOPUS:85217237562

SN - 0004-637X

VL - 980

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 78

ER -

Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations

Resumen

Nota bibliográfica

Financiación

ASJC Scopus subject areas

Acceder al documento

Otros archivos y enlaces

Huella

Citar esto