Pulse profiles and timing of PSR J1757$-$2421

TL;DR

This study presents 14 years of radio observations of PSR J1757-2421, revealing its unique spectral profile, a significant glitch in its rotation, and detailed recovery behavior post-glitch.

Contribution

It provides the first detailed analysis of the spectral and timing properties of PSR J1757-2421, including the detection and characterization of a large glitch.

Findings

Large spectral index variation across the profile.

Unusual increase in component separation with frequency.

A significant glitch with a fractional increase in spin frequency of ~7.8×10^{-6}.

Abstract

Pulse arrival time measurements over fourteen years with the Nanshan 25-m and Parkes 64-m radio telescopes have been used to determine the average profile and timing properties for PSR J1757$-$2421 (B1754$-$24). Analysis of the radio profile data shows a large variation of spectral index across the profile and an unusual increase in component separation with increasing frequency. The timing observations show that PSR B1754$-$24 underwent a large glitch with a fractional increase in spin frequency of $\Delta\nu_{\rm g}/\nu\sim 7.8\times10^{-6}$ in May 2011. At the time of the glitch there was a large permanent jump in the rotational frequency accompanied by two exponential recovery terms with timescales of 15(6) and 97(15) days, respectively.