Pulse profile variability associated with the glitch of PSR J1048-5832

Liu, Peng

PSR J1048-5832 (B1046-58) is a Vela-like pulsar that has exhibited multiple glitch events. In this study， we analyze the timing data spanning nearly 16 years， acquired from both the Fermi Gamma-ray Space Telescope and the Parkes 64 m radio telescope. As a result， a total of five glitches are detected within this dataset. Among them， a previously unknown small glitch is newly found at MJD 56985(9) (November 24， 2014)， which is also the smallest glitch recorded from this pulsar so far. The increments of the spin frequency and its first derivative are 2.2(3)×10^-8 Hz， and 3(2)×10^-15 s^-2， respectively. Changes in the integrated normalized mean pulse profile of radio band are observed following three of the five glitch events. Additionally， no notable alterations in the pulse profile are identified before and after the glitch events in the gamma-ray domain. We accordingly discuss the influence of glitches on the pulsar’s emission properties due to superfluid dynamics accompanied by crustquake， as well as the constraints on the equation of state.