Flux-density spectral analysis for several pulsars and two newly-identified gigahertz-peaked spectra

TL;DR

This study measures flux densities of 21 pulsars across a broad frequency range, identifying two new gigahertz-peaked spectrum pulsars, including the first with a low dispersion measure, and refines selection criteria for future GPS pulsar searches.

Contribution

The paper reports the discovery of two new GPS pulsars, including the first with low DM, and improves selection criteria for future GPS pulsar identification.

Findings

Identified two new GPS pulsars, one with low dispersion measure.

Revised criteria for selecting GPS pulsar candidates.

Highlighted potential high-frequency turnover in some pulsar spectra.

Abstract

In this paper we present results from flux density measurements for 21 pulsars over a wide frequency range, using the Giant Metrewave Radio Telescope (GMRT) and the Effelsberg telescope. Our sample was a set of mostly newly discovered pulsars from the selection of candidates for gigahertz-peaked spectra (GPS) pulsars. Using the results of our observations along with previously published data, we identify two new GPS pulsars. One of them, PSR J1740+1000, with dispersion measure of 24 pc cm$^{-3}$, is the first GPS pulsar with such a low DM value.We also selected several strong candidates for objects with high frequency turnover in their spectra which require further investigation.We also revisit our source selection criteria for future searches for GPS pulsars.