On the magnetic field inside the solar circle of the Galaxy: On the possibility of investigation some of characteristics of the interstellar medium with using of pulsars with large Faraday rotation values

TL;DR

This study uses pulsar Faraday rotation data to investigate the Galactic magnetic field, suggesting that large RM values are linked to specific interstellar regions and support a circular magnetic field model in the Galaxy.

Contribution

It demonstrates that pulsar RM data with large values can reveal the structure and orientation of the Galaxy's magnetic field, particularly supporting a circular model in certain regions.

Findings

Large RM values are associated with HII regions, nebulae, and molecular clouds.

The Galactic magnetic field in the 5-7 kpc radius range is consistent with a circular, counter-clockwise model.

Pulsar RM data can effectively probe the magnetic field structure of the interstellar medium.

Abstract

To study some characteristics of the interstellar medium, observational data of pulsars with large Faraday rotation values (|RM|> 300 rad / m2) were used. It was suggested and justified that large |RM| values can be due to the contribution of the regions with increased electron concentration, projected on the pulsar. Most likely these are the HII regions, dark nebulae and molecular clouds. In these objects the magnetic field can be oriented in the direction of a large-scale field of the Galaxy, or simply is a deformed extension of the galactic field. It was shown that the Galactic distribution of rotation measures of pulsars with |RM|> 300rad / m2 corresponds to the circular model of the magnetic field of the Galaxy, with the counter-clockwise direction of the magnetic field in the galactocentric circle 5 kpc <R <7 kpc.