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Title: Understanding the magnetic field configuration in X-Ray Pulsars through spectroscopy and polarimetry
Authors: Varun
Thesis Advisor: Paul, Biswajit
Subject: Astronomy and Astrophysics
Issue Date: Feb-2020
Publisher: Raman Research Institute, Bangalore
Citation: Ph.D. Thesis, Jawaharlal Nehru University, New Delhi, 2020
Abstract: Magnetic field plays an important role in the broadband emission of many astrophysical sources. The strength of this field whose presence leads to the observed polarization of radiation varies over an extraordinary range of about 20 orders of magnitude. Neutron stars have the most powerful magnetic field strength of 1012-1015 G. One interesting manifestation of this magnetic field is the cyclotron resonance scattering feature (CRSF) which is seen the spectrum of these sources. In this thesis, we present the results of pulse phase variation of CRSF in two high mass X-ray binaries using Astrosat-LAXPC observations. AstroSat is India's first multi-wavelength astronomy satellite. We also present results of other types of isolated neutron stars from AstroSat observations. Another manifestation of the presence of a strong magnetic field is the polarization of high energy radiation. The measurement of high energy polarization has been limited or somewhat elusive so far. This is now set to become possible thanks to the renewed efforts in the past decade. India is set to play an important role in this field with development POLIX, which is an X-ray polarimeter developed at RRI and to be launched by ISRO by the end of this year. We present the results of two ground calibration experiments for this instrument. We also present the experimental results for a new polarization measurement technique based on photo-electric interaction.
Description: Open Access
Copyright: This thesis is posted here with the permission of the author. Personal use of this material is permitted. Any other use requires prior permission of the author. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
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