Pulse-to-pulse flux density modulation from pulsars at 8.35 GHz

¹ Kepler Institute of Astronomy, University of Zielona Góra, ul. Lubuska 2, 65-265 Zielona Góra, Poland
e-mail: olaf@astro.ia.uz.zgora.pl
² Station de Radioastronomie de Nançay, Observatoire de Paris, CNRS/INSU, 18330 Nançay, France
³ Laboratoire de Physique et Chimie de l’Environnement et de l’Espace, LPC2E UMR 7328 CNRS, 45071 Orléans Cedex 2, France
⁴ National Centre for Radio Astrophysics, PO Bag 3, Pune University Campus, 411 007, Pune, India
⁵ Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany

Received: 6 November 2012
Accepted: 29 April 2013

Abstract

Aims. We aim to investigate the flux density modulation from pulsars and the specific behaviour of the modulation index versus frequency.

Methods. Several pulsars were observed with the Effelsberg radio telescope at 8.35 GHz. Their flux density time series were corrected for interstellar scintillation effects.

Results. We present measurements of modulation indices for eight pulsars. We confirm the presence of a critical frequency at ~1 GHz for these pulsars (including three 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 five pulsars.