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Quasar Continuum Spectrum Disfavors Black Holes with a Magnetic Monopole Charge by Banerjee, Indrani; Chawan, Vijay Shersingh; Mandal, Bhaswati; Sahoo, Siddharth Kumar; SenGupta, Soumitra is a scholarly article available to read on EtoBox.

What is Quasar Continuum Spectrum Disfavors Black Holes with a Magnetic Monopole Charge about?

Black holes carrying a magnetic monopole charge are a subject of interest for a long time. In this work we explore the possibility of an observational evidence of such black holes carrying a magnetic monopole, namely the Bardeen rotating black holes. We derive the theoretical spectrum from the accretion disk surrounding a Bardeen black hole using the thin-disk approximation. We compare the theoretically derived spectrum in comparison to the optical data of eighty Palomar Green quasars to constrain the monopole charge parameter $g$ and the spin parameter $a$ of the quasars. From our analysis we note that the Kerr-scenario in \gr\ is observationally more favored than black holes with a monopole charge. We arrive at such a conclusion using error estimators like $\chi^2$, the Nash-Sutcliffe efficiency, the index of agreement and their modified forms. In particular, black holes with $g \geq 0.03$ are outside $99\%$ confidence interval. The implications are discussed.

Author

Banerjee, Indrani; Chawan, Vijay Shersingh; Mandal, Bhaswati; Sahoo, Siddharth Kumar; SenGupta, Soumitra

Published

2021

Language

EN