Name: Arti Joshi
Affiliation: School of Physics and Technology, Wuhan University, Wuhan - 430072, China
Conference ID : ASI2022_341
Title : X-ray confirmation of the intermediate polar IGR J16547-1916
Authors : A. Joshi, W. Wang, J. C. Pandey, K. P. Singh, S. Naik, A. Raj, G. C. Anupama, and N. Rawat
Abstract Type: Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : Intermediate Polars (IPs), a subclass of magnetic cataclysmic variables (CVs), are semi-detached interacting binaries containing a magnetic white dwarf (WD), which accretes material from a Roche­ lobe filling companion star. The accretion mechanism in IPs is usually explained with the three different scenarios viz disk-fed, disk-less, and disk-overflow. We will present X-ray study of an intermediate polar IGR J16547-1916 using the NuSTAR and Swift observations. The detection of a strong X-ray spin pulse in IGR J16547-1916 reinforces the classification of this system as an intermediate polar. The lack of orbital or side-band periodicities in the X-rays implies that the system is accreting predominantly via a disk. A variable covering absorber appears to be responsible for the spin pulsations in the low energy range. In the high energy band, the pulsations are likely due to the self occultation of tall shocks above the white dwarf surface. We will also present the variation of the spin pulse profile over an orbital phase to account for the effects of orbital motion on spin pulsation. Based on the X-ray observations, we predict two-pole accretion geometry with tall or wide accretion regions for short rotating IP IGR16547-1916. The X-ray spectral analysis of this system provides the information of the complex and variable local absorbers, the soft X-ray excess emission, and the maximum temperature of the post-shock region. We will also present the spin phase-resolved spectral variations of IGR J16547-1916 and find dependencies in the X-ray spectral parameters during the rotation of the white dwarf.