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Images and flares of geodesic hotspots around a Kerr black hole

Published 26 Feb 2024 in gr-qc and astro-ph.HE | (2402.16293v2)

Abstract: In this study, we develop a numerical method to generate images on an observer's screen, formed by radiation from hotspots on any timelike orbits outside a black hole. This method uses the calculation of fractional numbers, enabling us not only to produce the overall image but also to distinguish between primary, secondary, and higher-order images. Building upon this, we compute the images of hotspots from eight potential types of geodesic timelike orbits outside a Kerr black hole, summarizing the properties of both the overall and individual order images. Furthermore, we calculate the centroid motion and lightcurve. Notably, we observe flare phenomena across all orbit types and classify these flares into three categories based on the Doppler and gravitational redshift effects.

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References (47)
  1. Event Horizon Telescope Collaboration, K. Akiyama et al., “First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole,” Astrophys. J. Lett. 875 (2019) L1, arXiv:1906.11238 [astro-ph.GA].
  2. Event Horizon Telescope Collaboration, K. Akiyama et al., “First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way,” Astrophys. J. Lett. 930 no. 2, (2022) L12, arXiv:2311.08680 [astro-ph.HE].
  3. GRAVITY Collaboration, R. Abuter et al., “Detection of orbital motions near the last stable circular orbit of the massive black hole SgrA,” Astron. Astrophys. 618 (2018) L10, arXiv:1810.12641 [astro-ph.GA].
  4. GRAVITY Collaboration, R. Abuter et al., “Polarimetry and astrometry of NIR flares as event horizon scale, dynamical probes for the mass of Sgr A*,” Astron. Astrophys. 677 (2023) L10, arXiv:2307.11821 [astro-ph.GA].
  5. G. Gyulchev, J. Kunz, P. Nedkova, T. Vetsov, and S. Yazadjiev, “Observational signatures of strongly naked singularities: image of the thin accretion disk,” Eur. Phys. J. C 80 no. 11, (2020) 1017, arXiv:2003.06943 [gr-qc].
  6. M. Guerrero, G. J. Olmo, D. Rubiera-Garcia, and D. S.-C. Gómez, “Shadows and optical appearance of black bounces illuminated by a thin accretion disk,” JCAP 08 (2021) 036, arXiv:2105.15073 [gr-qc].
  7. Y. Hou, Z. Zhang, H. Yan, M. Guo, and B. Chen, “Image of a Kerr-Melvin black hole with a thin accretion disk,” Phys. Rev. D 106 no. 6, (2022) 064058, arXiv:2206.13744 [gr-qc].
  8. X. Qin, S. Chen, Z. Zhang, and J. Jing, “Polarized image of a rotating black hole surrounded by a cold dark matter halo,” Eur. Phys. J. C 83 no. 2, (2023) 159, arXiv:2301.01551 [gr-qc].
  9. Y. Meng, X.-M. Kuang, X.-J. Wang, B. Wang, and J.-P. Wu, “Images from disk and spherical accretions of hairy Schwarzschild black holes,” Phys. Rev. D 108 no. 6, (2023) 064013, arXiv:2306.10459 [gr-qc].
  10. S. Guo, Y.-X. Huang, and G.-P. Li, “Optical appearance of the Schwarzschild black hole in the string cloud context*,” Chin. Phys. C 47 no. 6, (2023) 065105, arXiv:2305.00007 [gr-qc].
  11. Z. Zhang, Y. Hou, M. Guo, and B. Chen, “Imaging thick accretion disks and jets surrounding black holes,” arXiv:2401.14794 [astro-ph.HE].
  12. B. Ripperda, M. Liska, K. Chatterjee, G. Musoke, A. A. Philippov, S. B. Markoff, A. Tchekhovskoy, and Z. Younsi, “Black Hole Flares: Ejection of Accreted Magnetic Flux through 3D Plasmoid-mediated Reconnection,” Astrophys. J. Lett. 924 no. 2, (2022) L32, arXiv:2109.15115 [astro-ph.HE].
  13. GRAVITY Collaboration, R. Abuter et al., “Constraining particle acceleration in Sgr A⋆⋆\star⋆ with simultaneous GRAVITY, Spitzer, NuSTAR, and Chandra observations,” Astron. Astrophys. 654 (2021) A22, arXiv:2107.01096 [astro-ph.HE].
  14. J. Dexter et al., “Sgr A* near-infrared flares from reconnection events in a magnetically arrested disc,” Mon. Not. Roy. Astron. Soc. 497 no. 4, (2020) 4999–5007, arXiv:2006.03657 [astro-ph.HE].
  15. O. Porth, Y. Mizuno, Z. Younsi, and C. M. Fromm, “Flares in the Galactic Centre – I. Orbiting flux tubes in magnetically arrested black hole accretion discs,” Mon. Not. Roy. Astron. Soc. 502 no. 2, (2021) 2023–2032, arXiv:2006.03658 [astro-ph.HE].
  16. B. Ripperda, F. Bacchini, and A. Philippov, “Magnetic Reconnection and Hot Spot Formation in Black Hole Accretion Disks,” Astrophys. J. 900 no. 2, (2020) 100, arXiv:2003.04330 [astro-ph.HE].
  17. N. Scepi, J. Dexter, and M. C. Begelman, “Sgr A* X-ray flares from non-thermal particle acceleration in a magnetically arrested disc,” Mon. Not. Roy. Astron. Soc. 511 no. 3, (2022) 3536–3547, arXiv:2107.08056 [astro-ph.HE].
  18. H. Jia, B. Ripperda, E. Quataert, C. J. White, K. Chatterjee, A. Philippov, and M. Liska, “Millimeter observational signatures of flares in magnetically arrested black hole accretion models,” Mon. Not. Roy. Astron. Soc. 526 no. 2, (2023) 2924–2941, arXiv:2301.09014 [astro-ph.HE].
  19. F. Yuan, E. Quataert, and R. Narayan, “Nonthermal electrons in radiatively inefficient accretion flow models of Sagittarius A*,” Astrophys. J. 598 (2003) 301–312, arXiv:astro-ph/0304125.
  20. Z. Younsi and K. Wu, “Variations in emission from episodic plasmoid ejecta around black holes,” Mon. Not. Roy. Astron. Soc. 454 no. 3, (2015) 3283–3298, arXiv:1510.01700 [astro-ph.HE].
  21. D. Ball, F. Özel, P. Christian, C.-K. Chan, and D. Psaltis, “A plasmoid model for the sgr a* flares observed with gravity and chandra,” The Astrophysical Journal 917 no. 1, (2021) 8.
  22. N. Aimar, A. Dmytriiev, F. H. Vincent, I. E. Mellah, T. Paumard, G. Perrin, and A. Zech, “Magnetic reconnection plasmoid model for Sagittarius A* flares,” Astron. Astrophys. 672 (2023) A62, arXiv:2301.11874 [astro-ph.HE].
  23. M. E. Rowan, L. Sironi, and R. Narayan, “Electron and Proton Heating in Transrelativistic Magnetic Reconnection,” Astrophys. J. 850 no. 1, (2017) 29, arXiv:1708.04627 [astro-ph.HE].
  24. A. Levinson and B. Cerutti, “Particle-in-cell simulations of pair discharges in a starved magnetosphere of a Kerr black hole,” Astron. Astrophys. 616 (2018) A184, arXiv:1803.04427 [astro-ph.HE].
  25. A. Galishnikova, A. Philippov, E. Quataert, F. Bacchini, K. Parfrey, and B. Ripperda, “Collisionless Accretion onto Black Holes: Dynamics and Flares,” Phys. Rev. Lett. 130 no. 11, (2023) 115201, arXiv:2212.02583 [astro-ph.HE].
  26. I. El Mellah, B. Cerutti, and B. Crinquand, “Reconnection-driven flares in 3D black hole magnetospheres - A scenario for hot spots around Sagittarius A*,” Astron. Astrophys. 677 (2023) A67, arXiv:2305.01689 [astro-ph.HE].
  27. V. Zhdankin, B. Ripperda, and A. A. Philippov, “Particle acceleration by magnetic Rayleigh-Taylor instability: Mechanism for flares in black hole accretion flows,” Phys. Rev. Res. 5 no. 4, (2023) 043023, arXiv:2302.05276 [astro-ph.HE].
  28. A. E. Broderick and A. Loeb, “Imaging bright spots in the accretion flow near the black hole horizon of Sgr A*,” Mon. Not. Roy. Astron. Soc. 363 (2005) 353–362, arXiv:astro-ph/0506433.
  29. L. Meyer, A. Eckart, R. Schoedel, W. J. Duschl, K. Muzic, M. Dovciak, and V. Karas, “Near-infrared polarimetry setting constraints on the orbiting spot model for Sgr A* flares,” Astron. Astrophys. 460 (2006) 15, arXiv:astro-ph/0610104.
  30. S. Trippe, T. Paumard, T. Ott, S. Gillessen, F. Eisenhauer, F. Martins, and R. Genzel, “A polarised infrared flare from Sagittarius A* and the signatures of orbiting plasma hotspots,” Mon. Not. Roy. Astron. Soc. 375 (2007) 764–772, arXiv:astro-ph/0611737.
  31. N. Hamaus, T. Paumard, T. Muller, S. Gillessen, F. Eisenhauer, S. Trippe, and R. Genzel, “Prospects for testing the nature of Sgr A*’s NIR flares on the basis of current VLT- and future VLTI-observations,” Astrophys. J. 692 (2009) 902–916, arXiv:0810.4947 [astro-ph].
  32. M. Zamaninasab et al., “Near infrared flares of Sagittarius A*: Importance of near infrared polarimetry,” Astron. Astrophys. 510 (2010) A3, arXiv:0911.4659 [astro-ph.GA].
  33. V. I. Dokuchaev and N. O. Nazarova, “Modeling the motion of a bright spot in jets from black holes M87* and SgrA*,” Gen. Rel. Grav. 53 no. 8, (2021) 83, arXiv:2010.01885 [astro-ph.HE].
  34. J. a. L. Rosa, C. F. B. Macedo, and D. Rubiera-Garcia, “Imaging compact boson stars with hot spots and thin accretion disks,” Phys. Rev. D 108 no. 4, (2023) 044021, arXiv:2303.17296 [gr-qc].
  35. J. a. L. Rosa, D. S. J. Cordeiro, C. F. B. Macedo, and F. S. N. Lobo, “Observational imprints of gravastars from accretion disks and hot-spots,” arXiv:2401.07766 [gr-qc].
  36. Y. Chen, P. Wang, and H. Yang, “Interferometric Signatures of Black Holes with Multiple Photon Spheres,” arXiv:2312.10304 [gr-qc].
  37. Y. Chen, P. Wang, and H. Yang, “Observations of Orbiting Hot Spots around Scalarized Reissner-Nordström Black Holes,” arXiv:2401.10905 [gr-qc].
  38. T. Matsumoto, C.-H. Chan, and T. Piran, “The origin of hotspots around Sgr A*: Orbital or pattern motion?,” Mon. Not. Roy. Astron. Soc. 497 no. 2, (2020) 2385–2392, arXiv:2004.13029 [astro-ph.HE].
  39. M. Wielgus, M. Moscibrodzka, J. Vos, Z. Gelles, I. Marti-Vidal, J. Farah, N. Marchili, C. Goddi, and H. Messias, “Orbital motion near Sagittarius A* - Constraints from polarimetric ALMA observations,” Astron. Astrophys. 665 (2022) L6, arXiv:2209.09926 [astro-ph.HE].
  40. S. D. von Fellenberg et al., “General relativistic effects and the near-infrared and X-ray variability of Sgr A* I,” Astron. Astrophys. 669 (2023) L17, arXiv:2301.02558 [astro-ph.HE].
  41. GRAVITY Collaboration, M. Bauböck et al., “Modeling the orbital motion of Sgr A*’s near-infrared flares,” Astron. Astrophys. 635 (2020) A143, arXiv:2002.08374 [astro-ph.HE].
  42. G. Compère, Y. Liu, and J. Long, “Classification of radial Kerr geodesic motion,” Phys. Rev. D 105 no. 2, (2022) 024075, arXiv:2106.03141 [gr-qc].
  43. J. M. Bardeen, “Timelike and null geodesics in the Kerr metric,” Proceedings, Ecole d’Eté de Physique Théorique: Les Astres Occlus : Les Houches, France, August, 1972, 215-240 (1973) 215–240.
  44. Z. Hu, Z. Zhong, P.-C. Li, M. Guo, and B. Chen, “QED effect on a black hole shadow,” Phys. Rev. D 103 no. 4, (2021) 044057, arXiv:2012.07022 [gr-qc].
  45. R. W. Lindquist, “Relativistic transport theory,” Annals Phys. 37 no. 3, (1966) 487–518.
  46. Z. Zhang, Y. Hou, Z. Hu, M. Guo, and B. Chen, “Polarized images of charged particles in vortical motions around a magnetized Kerr black hole,” arXiv:2304.03642 [gr-qc].
  47. G. B. Rybicki and A. P. Lightman, Radiative processes in astrophysics. John Wiley & Sons, 1991.
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