Iron line spectroscopy with Einstein–dilaton–Gauss–Bonnet black holes

Einstein–dilaton–Gauss–Bonnet gravity is a well-motivated alternative theory of gravity that emerges naturally from string theory. While black hole solutions have been known in this theory in numerical form for a while, an approximate analytical metric was obtained recently by some of us, which allows for faster and more detailed analysis. Here we test the accuracy of the analytical metric in the context of X-ray reflection spectroscopy. We analyze innermost stable circular orbits (ISCO) and relativistically broadened iron lines and find that both the ISCO and iron lines are determined sufficiently accurately up to the limit of the approximation. We also find that, though the ISCO increases by about 7% as dilaton coupling increases from zero to extremal values, the redshift at ISCO changes by less than 1%. Consequently, the shape of the iron line is much less sensitive to the dilaton charge than expected. © 2018 The Authors

Авторы
Nampalliwar S.1 , Bambi C.1, 2 , Kokkotas K.D.1 , Konoplya R.A. 1, 3, 4
Редакторы
-
Издательство
-
Номер выпуска
-
Язык
Английский
Страницы
626-632
Статус
Опубликовано
Подразделение
-
Номер
-
Том
781
Год
2018
Организации
  • 1 Theoretical Astrophysics, Eberhard-Karls Universität Tübingen, Tübingen, 72076, Germany
  • 2 Center for Field Theory and Particle Physics, Department of Physics, Fudan University, Shanghai, 200433, China
  • 3 Institute of Physics, Research Centre of Theoretical Physics and Astrophysics, Faculty of Philosophy and Science, Silesian University in Opava, Opava, Czech Republic
  • 4 Peoples Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, Moscow, 117198, Russian Federation
Ключевые слова
-
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/6598/