Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations
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 twic...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ada292 |
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| author | K. L. Thompson T. H. Troland R. L. Plante |
| author_facet | K. L. Thompson T. H. Troland R. L. Plante |
| author_sort | K. L. Thompson |
| collection | DOAJ |
| description | 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 7 σ 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. |
| format | Article |
| id | doaj-art-588190cea8ab461abf8bfb5ac7758f16 |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-588190cea8ab461abf8bfb5ac7758f162025-02-05T07:18:47ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198017810.3847/1538-4357/ada292Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman ObservationsK. L. Thompson0https://orcid.org/0000-0002-0368-6330T. H. Troland1https://orcid.org/0000-0002-0310-8354R. L. Plante2https://orcid.org/0000-0002-9279-4877Davidson College , 209 Ridge Road, Davidson, NC 28035, USA ; krthompson@davidson.eduUniversity of Kentucky , Lexington, KY 40506, USANational Institute of Standards and Technology , Gaithersburg, MD 20899, USAVery 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 7 σ 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.https://doi.org/10.3847/1538-4357/ada292Galaxy magnetic fieldsGalactic center |
| spellingShingle | K. L. Thompson T. H. Troland R. L. Plante Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations The Astrophysical Journal Galaxy magnetic fields Galactic center |
| title | Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations |
| title_full | Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations |
| title_fullStr | Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations |
| title_full_unstemmed | Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations |
| title_short | Magnetic Field Strengths in the Vicinity of Sgr A* via 18 cm Zeeman Observations |
| title_sort | magnetic field strengths in the vicinity of sgr a via 18 cm zeeman observations |
| topic | Galaxy magnetic fields Galactic center |
| url | https://doi.org/10.3847/1538-4357/ada292 |
| work_keys_str_mv | AT klthompson magneticfieldstrengthsinthevicinityofsgravia18cmzeemanobservations AT thtroland magneticfieldstrengthsinthevicinityofsgravia18cmzeemanobservations AT rlplante magneticfieldstrengthsinthevicinityofsgravia18cmzeemanobservations |