Polarization observations of 100 pulsars at 774 MHz by the Green Bank Telescope

TL;DR

This paper presents new polarimetric observations of 100 pulsars at 774 MHz using the Green Bank Telescope, revealing polarization profiles, flux densities, and polarization behaviors, including first measurements for many pulsars.

Contribution

It provides the first polarization measurements for 67 pulsars and detailed polarization profiles for millisecond pulsars at 774 MHz, expanding the understanding of pulsar polarization properties.

Findings

Strong linear polarization observed in some pulsars, approaching 100%.

Circular polarization is generally weak but can be extremely strong in specific components.

Sense reversal of circular polarization detected in over 20 pulsars.

Abstract

We report on polarimetric observations of 100 pulsars centered on 774 MHz, made using the Green Bank Telescope, presenting their polarization profiles and polarized flux densities and comparing them with previous observations when possible. For 67 pulsars, these are the first such measurements made. Polarization profiles of 8 millisecond pulsars in our sample show wide profiles and flat position-angle curves. Strong linear polarization, sometimes approaching 100% of the total intensity, has been detected in all or a part of the average pulse profiles of some pulsars. In general, circular polarization is very weak, although it is observed to be extremely strong in the leading component of PSR J1920+2650. Sense reversal of circular polarization as a function of pulse phase has been detected from both core and other components of more than 20 pulsars. Any relationship between the spin-down luminosity and the percentage of linear polarization is not evident in our data at this frequency.