The Neutron Star (NS) Interior Composition ExploreR (NICER) has been operating aboard the International Space Station since 2017. Its ultimate aim is to constrain the equation of state of NSs with better precision. Recent studies have strongly indicated the presence of a multipolar magnetic field in the millisecond pulsars (MSPs) observed by NICER. We have implemented a complete, fully-analytical, and generic multipolar magnetic field up to an octupole component to (i) model their thermal X-ray light curves, (ii) predict the morphology of surface emission hotspots, and (iii) constrain their mass and radii. In my talk, I will discuss the magnetic field equations, highlight the field configuration for different components, and present preliminary results for a source (PSR J0030+0451).
Dr. Anu Kundu completed her Ph.D. at the Strasbourg Astronomical Observatory (ObAS), University of Strasbourg, in 2018. Later, she continued her postdoctoral work at the Centre for Space Research (CSR), North-West University (NWU), Potchefstroom, South Africa. Currently, she is a senior lecturer at the NWU. Her research interests are in high-energy astrophysical processes and data analysis. She has mainly worked on the pulsars and their nebulae to understand the mechanisms for the origin of radio and high-energy emission in these objects. She has also been a member of the High Energy Stereoscopic System (HESS) and Fermi-LAT collaboration since the last few years.