| Name: | Niranjan A |
| Affiliation: | Indian Institute of Science Education and Research, Mohali |
| Conference ID : | ASI2024_827 |
| Title : | Accretion onto strongly magnetized misaligned neutron stars |
| Authors : | Niranjan A1, Indranil Chattopadhyay2, Raj Kishor Joshi2, Shilpa Sarkar3 |
| Authors Affiliation: | 1 Indian Institute of Science Education and Research, Mohali
2 Aryabhatta Research Institute of Observational Sciences, Nainital
3 Harish-Chandra Research Institute, Allahabad |
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | Accretion onto strongly-magnetized misaligned neutron stars is investigated in this work. The region under consideration is the accretion curtain extending from a distance Rd from the neutron star till its surface, where magnetic pressure dominates both gas and ram pressure. This causes the matter to be channeled along the magnetic field lines. The magnetic field is assumed to be dipolar and accretion solutions are obtained in a self-consistent manner by including Bremsstrahlung and cyclotron radiative processes using a variable adiabatic index equation of state (CR EoS – Chattopadhyay and Ryu 2009). Previous works using this equation of state have focused on the case where the magnetic moment and rotation axis are aligned. However, a majority of the neutron stars detected so far are misaligned, with some non-zero angle between the magnetic moment and rotation axis, deeming it important to study such cases. It has been observed that even a small angle change from the aligned case produces significant changes in the accretion solutions. Cases with various angles between magnetic moment and rotation axis are plotted and compared. Primary shock close to the neutron star surface, which allows the accreting matter to settle down with a small velocity onto the surface, as well as secondary shocks far away from the surface, are considered in the analysis. It is found that the inclusion of radiative processes is important to satisfy the surface boundary conditions. |
