MULTI-FREQUENCY STUDY OF PULSAR B1929+10

Abstract

Time sequences of signals received from PSR 1929+10 have been recorded using RRI-MBR receiver. This receiver facilitates observations in ten fre- quency bands simultaneously. These voltage time sequences are further processed to obtain spectral information. Average profiles for all the bands are obtained by folding the time sequences and averaging the weighted channels. We had aimed to study notches but due to inadequate signal to noise ratio , it does not appear possible. Instead, we have studied the evolution of the component separation. However, two undesirable features in the data of our one of the best bands. First is an effect of gain compression, which occurs due to even a slight deviation of amplifier response linearity, encountered when input signal is high. A correction technique exploiting the dispersed nature of pulsar sig- nal has been developed successfully. The second undesirable feature was in form of a strange RFI signal which was narrowed band but periodic within each of its episode. We also explored the possibility of studying its polarization features across the multi bands with an eventual aim of estimating the possible shifts be- tween profile peak and points of inflection in the position angle sweep. These shifts are expected to provide estimates of emission heights at re- spective frequencies. We discuss our multi-frequency observations of this pulsar, the analysis details and implications of our results.