15 APRILE 2019 ore 15:00

A multiwavelength study of Crab Pulsar

Dr. Avishek Basu (National Centre for Radio Astrophysics, India)
A multiwavelength study of Crab Pulsar

Crab Pulsar PSR J0534+2200 is hosted by a very bright nebula and it is a relatively young pulsar of the characteristic age of few Kyrs. It is a unique pulsar and exhibits many different phenomena. The pulsed component across the rotational phase evolves significantly over the electromagnetic spectrum. It is bright in almost all waveband starting from the low-frequency radio to very high energy gamma rays hence with a reasonable amount of integration gives enough signal to noise ratio to perform timing studies. Along with the normal pulsed component, Crab pulsar emits giant radio pulses which are orders of magnitude larger than the normal pulsed intensity and much narrow in time the finest in sub-nanoseconds. Though in general pulsars are the known rivals of some best known atomic clocks on earth in terms of timing precision, owing to their stable rotation yet some of them show jittery rotations, they mostly belong to the younger population. Crab is one among such pulsars, it shows rotational irregularities called glitches and timing noise. In my talk, I will present some of the recent results we have obtained from long-term monitoring of Crab Pulsar from AstroSat-CZTI, GMRT, ORT and Fermi-LAT. There I will discuss the methodology we adopted to time-align all the telescopes, the effects of timing noise and its mitigation and effect of the interstellar medium which is dominant at low-frequency observations. I will also talk about the recent results on the analysis of Crab giant pulse.