Multi-frequency observations and spectral analysis of two gigahertz-peaked spectra pulsars

TL;DR

This study presents multi-frequency radio observations of two gigahertz-peaked spectrum pulsars, confirming the spectral shape of PSR J1740+1000 and documenting a spectral change in B1800-21 over a few years.

Contribution

It provides new flux density measurements across multiple frequencies, clarifies the spectral nature of PSR J1740+1000, and documents a temporal spectral change in B1800-21.

Findings

Confirmed gigahertz-peaked spectrum for PSR J1740+1000.

Documented spectral shape recovery of B1800-21 to pre-2012 form.

Observed spectral change in B1800-21 over a few years.

Abstract

We report the multi-frequency observations of two pulsars: J1740+1000 and B1800-21, using the Giant Metrewave Radio Telescope and the Green Bank Telescope. The main aim of these observations was to estimate the flux density spectrum of these pulsars, as both of them were previously reported to exhibit gigahertz-peaked spectra. J1740+1000 is a young pulsar far from the Galactic plane and the interpretation of its spectrum was inconclusive in the light of the recent flux density measurements. Our result supports the gigahertz-peaked interpretation of the PSR J1740+1000 spectrum. B1800-21 is a Vela-like pulsar near the W30 complex, whose spectrum exhibit a significant change between 2012 and 2014 year. Our analysis shows that the current shape of the spectrum is similar to that observed before 2009 and confirms that the observed spectral change happen in a time-scale of a few years.