Browsing by Author "Pedreros Medina, Javier Ignacio"

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    General relativistic ray tracing around rotating black holes: exploring the SED parameter space for RIAF models.
    (Universidad de Concepción, 2024) Pedreros Medina, Javier Ignacio; Schleicher, Dominik; Bandyopadhyay, Bidisha
    In active galactic nuclei (AGNs) a diversity of physical phenomena leading to the emission of electromagnetic radiation in very distinct forms can be found, which are observable and distinguishable via the spectral energy distributions (SEDs). This work focuses on modeling SEDs and studying their shapes, employing the GRTRANS code, which utilizes a ray-tracing technique to obtain intensities through the radiative transfer equation. In this research, schematic HARM models with a toroidal accretion disk and rHARM3D with a semi-thin accretion disk were utilized. We consider both thermal and non-thermal synchrotron radiation, varying AGN components such as the mass of the black hole (M•), the Eddington ratio (Ledd), the ion-electron temperature ratio (Ti/Te), the non-thermal power-law index (P), and the viewing angle (α) between the observer and the axis perpendicular to the disk plane, aiming to comprehend how these parameters affect the SED. Luminosity maps for each of these components at 22[GHz], 86[GHz], 230[GHz], and 345[GHz] are also studied to determine their frequency dependence. Finally, Sgr A* is simulated, and the spectral energy distribution that best fits the data is determined. This was done by finding the SED with a bolometric luminosity between Lbol = (6,8 − 9,2) × 1035[erg/s] for a "quiescent"state of Sgr A*. As a result, it was found that the Eddington ratio Ledd = 1,5 × 10−9, the ion-electron temperature ratio Ti/Te = 3, and the power index P = 3,2 are the best values to represent the SED of Sagittarius A* when considering thermal and non-thermal synchrotron radiation for angles between 20◦ and 40◦.
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