Search for pulsars in the summed power spectra at a frequency of 111 MHz

TL;DR

This study used long-term monitoring with the LPA LPI radio telescope to detect five new pulsars at 111 MHz, significantly improving sensitivity through spectral summing and noise normalization.

Contribution

The paper introduces a method for pulsar detection using summed power spectra with noise normalization, leading to a 20-fold sensitivity increase over individual observations.

Findings

Detected five new pulsars in 96 sky beams.

Achieved over 20 times sensitivity improvement.

Sensitivity for pulsars >100 ms is 1.2 mJy outside the Galaxy plane.

Abstract

The search of pulsars in monitoring observations being carried out for 5 years using LPA LPI radio telescope was done in 96 spatial beams covering daily 17,000 square degrees. Five new pulsars were detected. Candidates into pulsars were selected in the summed power spectra. The use of a noise generator allowed to renormalize the data and to perform correct summing up of the power spectra for individual directions in the sky. Herewith, the sensitivity increased more than 20 times in comparison with individual sessions of observations. For pulsars with pulse durations greater than 100 ms at declinations +30o<dec.<+40o it is equal to 1.2 mJy and 0.4 mJy in/out of the Galaxy plane.