https://doi.org/10.1140/epjc/s10052-016-4511-0
Regular Article - Theoretical Physics
Silhouette and spectral line profiles in the special modification of the Kerr black hole geometry generated by quintessential fields
Faculty of Philosophy and Science, Institute of Physics and Research Centre for Theoretical Physics and Astrophysics, Silesian University in Opava, Bezručovo nám. 13, 74601, Opava, Czech Republic
* e-mail: jan.schee@fpf.slu.cz
Received:
30
June
2016
Accepted:
14
November
2016
Published online:
23
November
2016
We study optical effects in quintessential Kerr black hole spacetimes corresponding to the limiting case of the equation-of-state parameter 
of the quintessence. In dependence on the dimensionless quintessential field parameter c, we determine the black hole silhouette and the spectral line profiles of Keplerian disks generated in this special quintessential Kerr geometry, representing an extension of the general modifications of the Kerr geometry introduced recently by Ghasemi-Nodehi and Bambi (Eur. Phys. J. C 56:#290, 2016). We demonstrate that due to the influence of the parameter c, the silhouette is almost homogeneously enlarged, and the spectral line profiles are redshifted with almost conserved shape.
© The Author(s), 2016
