An analytic model to study the radiative and thermodynamical properties of a corona around a compact object. II Feedback model

Roomer, Jesse A.E. (2022) An analytic model to study the radiative and thermodynamical properties of a corona around a compact object. II Feedback model. Bachelor's Thesis, Astronomy.

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Abstract

A model is created for the escaping photon distribution of a corona around a compact object as a function of time and energy which includes feedback from the corona to the source. This model uses the exact closed-form expression for the time-dependent Green's function solution to the Kompaneets' equation found by Becker (2004). In a previously created model described in Roomer (2021) it is assumed that no photons from the corona are going back into the black body. This model describes the evolution in energy space of a photon distribution with a varying injection rate or varying black body temperature. In a case where the photons would fall back into the source, the returning photons will change the temperature of the source, since they add energy to the black body. For a new, improved model, this feedback will be added to the model containing temperature oscillations from Roomer (2021). The model can be used to create light curves, spectra, power density spectra (PDS), phase lags, and root mean square (rms). Here, the PDS will show peaks, also known as quasi-periodic oscillations or QPOs which are also found in PDS of observations and can be used to compare to the data. The phase lags can be reproduced by the model to compare with observations. The feedback model is obtained for different oscillation frequency values. These different results are then compared. The width of one QPO in a PDS for one frequency has also been determined using a Lorentzian fit.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Mendez, R.M. and Garcia, F.
Degree programme:	Astronomy
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	19 Jul 2022 09:13
Last Modified:	19 Jul 2022 09:13
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/27999

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