https://doi.org/10.1140/epjc/s10052-024-13113-w
Regular Article - Theoretical Physics
Photon emissions from Kerr equatorial geodesic orbits
1
Department of Physics, Peking University, No. 5 Yiheyuan Rd, 100871, Beijing, People’s Republic of China
2
Department of Physics, Beijing Normal University, 100875, Beijing, People’s Republic of China
3
College of Physics, Taiyuan University of Technology, 030024, Taiyuan, People’s Republic of China
4
Center for High Energy Physics, Peking University, No. 5 Yiheyuan Rd, 100871, Beijing, People’s Republic of China
5
Collaborative Innovation Center of Quantum Matter, No. 5 Yiheyuan Rd, 100871, Beijing, People’s Republic of China
Received:
20
July
2023
Accepted:
9
July
2024
Published online:
23
July
2024
We consider the light emitters moving freely along the geodesics on the equatorial plane near a Kerr black hole and study the observability of these emitters. To do so, we assume these emitters emit photons isotropically and monochromatically, and we compute the photon escaping probability (PEP) and the maximum observable blueshift (MOB) of the photons that reach infinity. We obtain numerical results of PEP and MOB for the emitters along various geodesic orbits, which exhibit distinct features for the trajectories of different classes. In particular, we find that the plunging emitters could have considerable observability even in the near-horizon region. This interesting observational feature becomes more significant for the high-energy emitters near a high-spin black hole. As the radiatively-inefficient accretion flow may consist of plunging emitters, the present work could be of great relevance to the astrophysical observations.
© The Author(s) 2024
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