# Detection of radio emission from the gamma-ray pulsar J1732-3131 at 327 MHz

## TL;DR

This study reports the detection of the gamma-ray pulsar J1732-3131 at 327 MHz, revealing it as a faint, steep-spectrum radio source with a phase-offset between radio and gamma-ray peaks, supporting outer magnetosphere emission models.

## Contribution

First detection of J1732-3131 at 327 MHz with detailed analysis, establishing it as a faint, steep-spectrum pulsar and linking radio and gamma-ray emission characteristics.

## Key findings

- Detected pulsar at 327 MHz with 99.82% confidence
- Measured phase-offset of 0.24±0.06 between radio and gamma-ray peaks
- Identified the pulsar as one of the least-luminous known pulsars

## Abstract

Although originally discovered as a radio-quiet gamma-ray pulsar, J1732-3131 has exhibited intriguing detections at decameter wavelengths. We report an extensive follow-up of the pulsar at 327 MHz with the Ooty radio telescope. Using the previously observed radio characteristics, and with an effective integration time of 60 hrs, we present a detection of the pulsar at a confidence level of 99.82%. The 327 MHz mean flux density is estimated to be 0.5-0.8 mJy, which establishes the pulsar to be a steep spectrum source and one of the least-luminous pulsars known to date. We also phase-aligned the radio and gamma-ray profiles of the pulsar, and measured the phase-offset between the main peaks in the two profiles to be 0.24$\pm$0.06. We discuss the observed phase-offset in the context of various trends exhibited by the radio-loud gamma-ray pulsar population, and suggest that the gamma-ray emission from J1732-3131 is best explained by outer magnetosphere models. Details of our analysis leading to the pulsar detection, and measurements of various parameters and their implications relevant to the pulsar's emission mechanism are presented.