Abstract Details
| Name: ANSHU CHATTERJEE Affiliation: SAHA INSTITUTE OF NUCLEAR PHYSICS Conference ID: ASI2015_528 Title : Time dependent model of middle aged Pulsar Wind Nebulae Authors and Co-Authors : Lab Saha TIFR, Mumbai Pratik Majumdar SINP, Kolkata Abstract Type : Poster Abstract Category : Stars, The Milky Way Galaxy and its neighbours Abstract : Pulsar Wind Nebulae(PWNe) constitute the largest class of identified galactic objects in VHE gamma-ray astronomy. The ultra-relativistic particle wind from pulsar energizes the ambient medium and forms a nebula around the pulsar. The evolutionary trends of photon spectrum of PWNe over its age are not completely known. A leptonic, time-dependent model of PWNe has been constructed. The model gives the time evolution of electron energy distribution of PWNe by solving time-energy dependent diffusion loss eqution. The time dependent electron energy spectrum is balanced by injection, energy loss and escape. Different types of radiative losses have been included due to the interaction of electron with magnetic and photon field. Loss mechanisms include synchrotron, inverse Compton(with different photon fields like CMB, FIR, NIR), self synchrotron compton(SSC) and bremsstrahlung processes. The escape term includes the effect of the high energy electrons escaping due to large Larmor radius. The central pulsar injects an electron spectrum into the nebula. The model will be applied to a set of middle age PWNe to study the possible existence of common evolutionary trends and to link them with the characteristics of the associated pulsar. |