Thermal emission and line profiles from magnetized accretion disks

IGNACIO F. RANEA-SANDOVAL; FEDERICO GARCÍA

Buenos Aires

Congreso; GRACO II: 2nd Gravitation, Astrophysics and Cosmology Argentine-Brazilean Meeting; 2014

Grupo GARRA, Instituto Argentino de Radioastronomía

Observations of X-ray binary systems provide strong evidences of the existence of compact objects too massive to be explained by current neutron star models. When these systems are in the thermal ({\em high/soft}) state their emission spectra in the ${0{.}1-5}$~keV range can be modeled by means of the thermal radiation of an accretion disk formed around super-compact objects. The profile of the fluorescent iron line is useful to get insight related with the nature of the compact object. In this work we developed a numerical scheme able to calculate thermal spectra of magnetized Page-Thorne accretion disks formed around both rotating black holes and naked singularities as seen by an arbitrary distant observer. We incorporated two different magnetic field configurations: uniform and dipolar, using a perturbative scheme in the coupling constant between matter and magnetic field. Under the same assumptions we obtained observed synthetic line profiles of the $6{.}4$~keV iron line. We show that the presence of an external magnetic field produces potentially observable modifications on both the thermal energy spectrum and fluorescent iron line profile.