تقرير
M51 ULX-7: super-orbital periodicity and constraints on the neutron star magnetic field
| العنوان: | M51 ULX-7: super-orbital periodicity and constraints on the neutron star magnetic field |
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| المؤلفون: | Vasilopoulos, G., Lander, S. K., Koliopanos, F., Bailyn, C. D. |
| سنة النشر: | 2019 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | In the current work we explore the applicability of standard theoretical models of accretion to the observed properties of M51 ULX-7. The spin-up rate and observed X-ray luminosity are evidence of a neutron star with a surface magnetic field of $2-7\times10^{13}$ G, rotating near equilibrium. Analysis of the X-ray light-curve of the system (Swift/XRT data) reveals the presence of a $\sim$39 d super-orbital period. We argue that the super-orbital periodicity is due to disc precession, and that material is accreted onto the neutron star at a constant rate throughout it. Moreover, by attributing this modulation to the free precession of the neutron star we estimate a surface magnetic field strength of $3-4\times10^{13}$ G. The agreement of these two independent estimates provide strong constraints on the surface polar magnetic field strength of the neutron star. Comment: 11 pages, 6 figures, accepted for publication in MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stz3298 |
| URL الوصول: | http://arxiv.org/abs/1911.09670 |
| رقم الأكسشن: | edsarx.1911.09670 |
| قاعدة البيانات: | arXiv |
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