The effect of magnetic field on the inner Galactic rotation curve
arXiv:2208.06098 · doi:10.1093/mnrasl/slac091
Abstract
In the past few decades, some studies pointed out that magnetic field might affect the rotation curves in galaxies. However, the impact is relatively small compared with the effects of dark matter and the baryonic components. In this letter, we revisit the impact of magnetic field on the rotation curve of our Galaxy. We show that the inner Galactic rotation curve could be affected significantly by the magnetic field. The addition of the inner bulge component, which has been proposed previously to account for the inner rotation curve data, is not necessary. The magnetic field contribution can fully account for the excess of the inner rotation velocity between 5 pc to 50 pc from the Galactic Centre. Our analysis can also constrain the azimuthal component of the central regular magnetic field strength to G, which is consistent with the observed range.
Accepted in MNRAS Letters
References in corpus (10)
- SPARC: Mass Models for 175 Disk Galaxies with Spitzer Photometry and Accurate Rotation Curves
- Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole
- Diffuse Radio Emission from Galaxy Clusters
- Spatial distribution of interstellar gas in the innermost 3 kpc of our Galaxy
- Magnetism in the spiral galaxy NGC 6946: magnetic arms, depolarization rings, dynamo modes and helical fields
- The Radio Spectral Energy Distribution and Star Formation Rate Calibration in Galaxies
- Dark Halos of M31 and the Milky Way
- The Radio Continuum-Star Formation Rate Relation in WSRT SINGS Galaxies
- Do magnetic fields influence gas rotation in galaxies?
- Influence of dark matter on gravitational stability of isothermal gas clouds