Autocorrelation signatures in time-resolved black hole flare images: secondary peaks and convergence structure
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909800907931648 |
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| author | Zhang, Zhenyu Hou, Yehui Guo, Minyong Mizuno, Yosuke Chen, Bin |
| author_facet | Zhang, Zhenyu Hou, Yehui Guo, Minyong Mizuno, Yosuke Chen, Bin |
| contents | The strong gravitational field of a black hole bends light, forming multi-level images, yet extracting precise spacetime information from them remains challenging. In this study, we investigate how gravitational lensing leaves unique and detectable signatures in black hole movies using autocorrelation analysis. By examining the two-dimensional autocorrelation of a movie depicting a hotspot orbiting a Kerr black hole, as viewed by a near-axis observer, we identify a persistent secondary peak structure induced by gravitational lensing. Notably, these secondary peaks converge toward an approximately fixed point in the time-angle lag domain, largely independent of the orbital radius of the hotspot. This key property suggests that combining future flare observations with precise autocorrelation analysis could effectively disentangle lensing effects from orbital dynamics, enabling direct measurement of black hole parameters. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_17200 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Autocorrelation signatures in time-resolved black hole flare images: secondary peaks and convergence structure Zhang, Zhenyu Hou, Yehui Guo, Minyong Mizuno, Yosuke Chen, Bin High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology The strong gravitational field of a black hole bends light, forming multi-level images, yet extracting precise spacetime information from them remains challenging. In this study, we investigate how gravitational lensing leaves unique and detectable signatures in black hole movies using autocorrelation analysis. By examining the two-dimensional autocorrelation of a movie depicting a hotspot orbiting a Kerr black hole, as viewed by a near-axis observer, we identify a persistent secondary peak structure induced by gravitational lensing. Notably, these secondary peaks converge toward an approximately fixed point in the time-angle lag domain, largely independent of the orbital radius of the hotspot. This key property suggests that combining future flare observations with precise autocorrelation analysis could effectively disentangle lensing effects from orbital dynamics, enabling direct measurement of black hole parameters. |
| title | Autocorrelation signatures in time-resolved black hole flare images: secondary peaks and convergence structure |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2503.17200 |