| Download | - View final version: What rogue hydrogen clouds tell us about galactic magnetic fields (PDF, 2.1 MiB)
|
|---|
| DOI | Resolve DOI: https://doi.org/10.3847/1538-4357/ad9338 |
|---|
| Author | Search for: Forster, Bailey M.1; Search for: Foster, Tyler J.ORCID identifier: https://orcid.org/0000-0002-3189-4882; Search for: Kothes, Roland1ORCID identifier: https://orcid.org/0000-0001-5953-0100; Search for: Hill, Alex S.1ORCID identifier: https://orcid.org/0000-0001-7301-5666; Search for: Brown, Jo-Anne C.ORCID identifier: https://orcid.org/0000-0003-4781-5701 |
|---|
| Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
|
|---|
| Format | Text, Article |
|---|
| Subject | interstellar magnetic fields; interstellar medium; interstellar clouds; high-velocity clouds |
|---|
| Abstract | Observations of the Milky Way and external galaxies support the idea that large-scale magnetic fields are concentrated in galactic disks, with halo magnetic fields at least an order of magnitude weaker. However, very little is known about the transition between the two. We present the discovery of linearly polarized radio emission at the interface between interacting shells of gas within a well-known grouping of high-velocity clouds (HVCs), the anticenter shell. Faraday rotation of diffuse emission and of background extragalactic compact sources demonstrates an enhancement of the field at the interface. This is the clearest observed example of an HVC altering the large-scale magnetic field at the disk–halo interface and is the first image of magnetic field effects in an HVC. These results demonstrate the possibility of future three-dimensional reconstruction of the Galactic magnetic field and showcase the versatility of the Synthesis Telescope at the Dominion Radio Astrophysical Observatory as one of the few existing telescopes that can exploit this new method of probing Galactic magnetism. |
|---|
| Publication date | 2025-01-24 |
|---|
| Publisher | IOP |
|---|
| Licence | |
|---|
| In | |
|---|
| Language | English |
|---|
| Peer reviewed | Yes |
|---|
| Export citation | Export as RIS |
|---|
| Report a correction | Report a correction (opens in a new tab) |
|---|
| Record identifier | 0fe619ea-677b-4fce-9fc0-d58bbc1a0cfd |
|---|
| Record created | 2025-06-09 |
|---|
| Record modified | 2025-06-09 |
|---|
