The influence of magnetic field geometry on magnetars X-ray spectra

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Title: The influence of magnetic field geometry on magnetars X-ray spectra
Authors: Viganò, Daniele | Parkins, Nikki | Zane, Silvia | Turolla, Roberto | Pons, José A. | Miralles, Juan A.
Research Group/s: Astrofísica Relativista
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Neutron stars | X-ray sources | X-ray bursts | Inner magnetosphere
Knowledge Area: Astronomía y Astrofísica
Issue Date: 2012
Publisher: IOP Publishing
Citation: Journal of Physics: Conference Series. 2012, 342(1): 012013. doi:10.1088/1742-6596/342/1/012013
Abstract: Nowadays, the analysis of the X-ray spectra of magnetically powered neutron stars or magnetars is one of the most valuable tools to gain insight into the physical processes occurring in their interiors and magnetospheres. In particular, the magnetospheric plasma leaves a strong imprint on the observed X-ray spectrum by means of Compton up-scattering of the thermal radiation coming from the star surface. Motivated by the increased quality of the observational data, much theoretical work has been devoted to develop Monte Carlo (MC) codes that incorporate the effects of resonant Compton scattering (RCS) in the modeling of radiative transfer of photons through the magnetosphere. The two key ingredients in this simulations are the kinetic plasma properties and the magnetic field (MF) configuration. The MF geometry is expected to be complex, but up to now only mathematically simple solutions (self-similar solutions) have been employed. In this work, we discuss the effects of new, more realistic, MF geometries on synthetic spectra. We use new force-free solutions [14] in a previously developed MC code [9] to assess the influence of MF geometry on the emerging spectra. Our main result is that the shape of the final spectrum is mostly sensitive to uncertain parameters of the magnetospheric plasma, but the MF geometry plays an important role on the angle-dependence of the spectra.
ISSN: 1742-6588 (Print) | 1742-6596 (Online)
DOI: 10.1088/1742-6596/342/1/012013
Language: eng
Type: info:eu-repo/semantics/article
Rights: Published under licence in Journal of Physics: Conference Series by IOP Publishing Ltd.
Peer Review: si
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Appears in Collections:INV - Astrofísica Relativista - Artículos de Revistas

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