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

arXiv comment10 pages, 2 tables, 9 figures, accepted for publication in MNRAS

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• A LOFAR census of non-recycled pulsars: extending below 80 MHz
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