Pulse to pulse flux density modulation from pulsars at 8.35 GHz

TL;DR

This study measures flux density modulation in pulsars at 8.35 GHz, confirming a critical frequency around 1 GHz and revealing intrinsic modulation indices and strong single pulses in several pulsars.

Contribution

It provides new measurements of modulation indices at high frequency and confirms the critical frequency for flux density modulation in pulsars.

Findings

Confirmed critical frequency at ~1 GHz for pulsar modulation

Derived intrinsic modulation indices for 8 pulsars

Detected strong single pulses in 5 pulsars

Abstract

Aims. To investigate the flux density modulation from pulsars and the existence of specific behaviour of modulation index versus frequency. Methods. Several pulsars have been observed with the Effelsberg radio telescope at 8.35 GHz. Their flux density time series have been corrected for interstellar scintillation effects. Results. We present the measurement of modulation indices for 8 pulsars. We confirm the presence of a critical frequency at ~1 GHz for these pulsars (including 3 new ones from this study). We derived intrinsic modulation indices for the resulting flux density time series. Our data analysis revealed strong single pulses detected from 5 pulsars.