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.
| Original language | English |
|---|---|
| Article number | 78 |
| Journal | Astrophysical Journal |
| Volume | 980 |
| Issue number | 1 |
| DOIs | |
| State | Published - Feb 10 2025 |
Bibliographical note
Publisher Copyright:© 2025. The Author(s). Published by the American Astronomical Society.
Funding
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.
| Funders | Funder number |
|---|---|
| National Science Foundation Arctic Social Science Program | AST 0908841 |
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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