Distances of Galactic Radio Pulsars; First Quadrant: $-2^\circ < \ell < 90^\circ$ and $-2^\circ < b < 2^\circ$

TL;DR

This study constructs detailed distance versus dispersion measure relations for Galactic radio pulsars in the first quadrant, providing insights into electron density and pulsar distribution, and compares these with existing models.

Contribution

It introduces new distance-DM relations for pulsars in the first Galactic quadrant using independent measurements, enhancing understanding of Galactic electron density and pulsar distribution.

Findings

Derived average free electron densities for specific Galactic regions.

Compared pulsar distances with existing models for validation.

Discussed plasma effects in Galactic arms and bulge regions.

Abstract

Distance versus dispersion measure relations are constructed for Galactic radio pulsars in small solid angle intervals. The calculations are based on some basic criteria as well as using the independent distance measurements of well examined pulsars for the first Galactic quadrant including Galactic central directions. Values of average free electron density for these regions are derived from the fits to distance versus dispersion measure relations and checked for consistency and smoothness. The effects of plasma in the Galactic arms and within the central parts of the Galactic bulge region are also compared and discussed. Our adopted distances for the radio pulsars are compared with the ones given in some other models. Some basic results on distributions of the radio pulsars and the plasma are presented.