Date: Wednesday 04-Sep-2024
Time: 11:30-12:30 pm
Location: PSC 1136
Speaker: Rachael Stewart (George Washington University)
Title: Phase-Resolved Broadband X-ray Analysis of the Magnetar 1RXS J170849.0-400910 with XMM-Newton, NuSTAR, and IXPE
Abstract: Magnetars are a subclass of neutron stars characterized by extreme magnetic fields reaching up to 10^15 gauss—significantly higher than those found in typical pulsars. The decay of these supercritical fields generates bright, polarized X-ray emissions. The observed spectro-polarimetric properties of these emissions reveal information about the magnetar’s magnetic field configuration, surface temperature distribution, and the characteristics of its atmosphere and surface layers. Broadband, phase-resolved spectro-polarimetry is therefore a powerful tool for probing the emission geometry of magnetars. The magnetar 1RXS J170849.0-400910 possesses bright and persistent X-ray flux, a high pulsed fraction, and significant polarization levels. These characteristics make it an ideal target for detailed phase-resolved spectroscopic and polarimetric study. In this presentation, I will discuss findings from a deep, simultaneous NuSTAR and XMM-Newton observation of 1RXS J170849.0-400910, along with a re-analysis from an IXPE observation. This analysis provides the most comprehensive broadband X-ray phase-resolved spectro-polarimetric study of this source to date. The results provide new insights into the magnetar’s source geometry and surface heat distribution, enhancing our understanding of X-ray radiative processes in high magnetic field environments.
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Past CTC Lunch seminars.
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SPECIAL ACCOMMODATIONS:
Special accommodations for individuals with disabilities can be made by calling (301) 405-3001. It would be appreciated if we are notified at least one week in advance.
