Global parameters of Quasars with anomalous electromagnetic spectrum

TL;DR

This thesis analyzes weak emission-line quasars to determine their fundamental parameters using continuum fitting, and investigates an unusual absorption feature in a specific quasar with a corona and warm skin model.

Contribution

It introduces a continuum fit method for estimating black hole parameters in weak emission-line quasars, independent of emission line measurements, and explores the absorption feature with a corona and warm skin model.

Findings

Estimated black hole masses, spins, and accretion rates for 10 quasars.

Developed a continuum fitting method independent of emission line FWHM.

Explained the deep absorption in one quasar with corona and warm skin model.

Abstract

The thesis concerns the analysis of the Active Galactic Nuclei. These are galaxies with an active core. The most luminous type of Active Galactic Nuclei is Quasar. It contains the supermassive black hole at the center. One of the least known subtype of Quasars are: Weak emission-Line Quasars. Their recognizable feature are weak emission-lines. The primary goal of PhD thesis is to evaluate the global parameters such as: the black hole mass, the accretion rate, spin of the black hole, and the inclination of weak emission-line quasars based on the continuum fit method. This method apart from the literature black hole masses estimation methods does not depend on the observed Full Width at Half Maximum of emission line, which could be biased due to the weakness or lack of the emission lines in these quasars. Using the Spectral Energy Distribution of quasars, I have fitted the geometrically thin and optically thick accretion disk model described by Novikov \& Thorne equations. I have obtained the model of the continuum of the accretion disk for the 10 weak emission-line quasars. The second project concerned the description of abnormal, deep absorption of SDSS J110511.15+530806.5 quasar. I checked the correctness of the thesis posed that corona and warm skin concept above/around an accretion disk explain this phenomenon.