2018/12/31 by Fen Long, Songbai Chen, Jieci Wang +1 · 10 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Black Holes and Theoretical Physics #Black hole (networking) #Electromagnetic radiation #Line (geometry) #Observer (physics) #Plane (geometry) #Redshift #Rotating black hole #Spin-flip #gr-qc
paper · pdf · doi:10.1140/epjc/s10052-019-6989-8
published in The European Physical Journal C 79(6) (Springer Science+Business Media) · 18 pages, 7 figures
openalex created_date 2019/01/11 · openalex publication_date 2019/06/01 · arxiv created 2019/06/09 · arxiv updated 2019/06/11 · openalex updated_date 2026/08/05
We have studied electromagnetic line emissions from near-horizon region in the extremal Kerr-Taub-NUT black hole spacetime and then probe the effects of NUT charge on the electromagnetic line emissions. Due to the presence of the NUT charge, the equatorial plane is no more a symmetry plane of the KTN spacetime, which leads to that the dependence of electromagnetic line emission on the NUT charge for the observer in the Southern Hemisphere differs from that in the Northern one. Our result indicate that the electromagnetic line emission in the Kerr-Taub-NUT black hole case is brighter than that in the case of Kerr black hole for the observer in the equatorial plane or in the Southern Hemisphere, but it becomes more faint as the observer’s position deviates far from the equatorial plane in the Northern one. Moreover, we also probe effects of redshift factor on electromagnetic emission from near-horizon region in the extremal Kerr-Taub-NUT black hole spacetime.