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Title: Orbital temporal and spectral properties of X-ray binaries
Authors: Aftab, Nafisa
Thesis Advisor: Paul, Biswajit
Subject: Astronomy and Astrophysics
Issue Date: Nov-2018
Publisher: Raman Research Institute, Bangalore.
Citation: Ph.D. Thesis, Jawaharlal Nehru University, New Delhi, 2018
Abstract: X-ray binaries host a large fraction of all types of X-ray emitting sources in the universe. In 55 years of X-ray Astronomy many interesting features of X-ray binaries have been revealed, with the help of X-ray detectors on board balloons and different generations of X-ray missions in space. Study of the environment of different classes of X-ray binaries through X-ray reprocessing is one of the active area of research in X-ray astronomy. Major challenge in understanding X-ray reprocessing in X-ray binaries is because of the presence of brighter primary radiation along with the reprocessed emission. During eclipse in X-ray binaries, the primary emission from the source is blocked by the companion star allowing study of X-ray reprocessing. In the first part of my talk I will discuss some features of X-ray reprocessing in a number of eclipsing high and low mass X-ray binary (HMXB and LMXB) systems observed with XMM-Newton. From the comparison of the eclipse and the out-of-eclipse spectra we try to understand the wind and accretion disk characteristics, which are the main reprocessing agents in the HMXB and LMXB systems respectively. X-ray spectra show the presence of several metals in the binary environment, which we use in our day-to-day life on earth. Another interesting feature of accreting systems are off-states. Exact physical causes for its occurrence is not yet firmly established. The nature of the off-states and hence its origin changes from source to source and can also be different for a particular source at different epochs. I will discuss some off-state like features in a supergiant high mass X-ray binary system IGR J18027-2016 which we have found with Swift-XRT. I will also discuss some peculiar timing and spectral behaviour of a less explored high mass X-ray binary system IGR J00370+6122 found with Suzaku and XMM-Newton.
Description: Restricted 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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