Vol. 525In section 7. Stellar structure and evolution1st December 2010

A low frequency study of PSRs B1133+16, B1112+50, and B0031-07

by R. Karuppusamy, B. W. Stappers, and M. Serylak, A&A 525, A55 alt

The authors study three bright pulsars at low frequency (110-180 MHz) using the Westerbork Radio Synthesis Telescope (WRST) in a tied array mode to obtain quality spectra and pulse profiles. They show that the distribution of bright pulses follows a similar long tail distribution in all three. There is no evidence for interpulse emission at these low frequencies in any of the three. The results presented in this work suggest a spectral turn-over near 140 MHz for PSR B1133+16 and above 180 MHz for PSRs B0031-07 and B1112+50. The modulation index of the pulsars considered here increases with decreasing frequency indicating the prevalence of bright and spiky emission. The study shows the increasing complexity of pulsar phenomenology as one moves to lower frequency and highlights the potential for LOWFAR and SKA.