A systematic study on frequency evolution behavior of pulsar pulse profiles
Xu, Xin
In this talk, we will show that the evolution of W50 for 74 pulsars with frequency from tens of megahertz to thousands of megahertz. We find that 71 pulsars show "absorption" features, which indicates that the absorption is an universal phenomenon in the pulsar population and independent with the type of pulsar profile. It is found that for most pulsars, the "absorption" features appear in the frequency range of 100 MHz-800 MHz, and the evolution trend of W50 at frequencies less than ~100 MHz and large than ~800 MHz can be described as a power-law function. We quantify the absorption intensity and analyze the correlation between the absorption intensity and the pulsar parameters (such as the spin period, magnetic field and age of pulsar). It is found that there is no direct correlation between them. Our results will provide good samples and clues for the study of the physical mechanism of "absorption" phenomenon.