An Upper Limit on the Charge of the Black Hole Sgr A* from EHT Observations
The Event Horizon Telescope (EHT) recently released an image of the supermassive black hole Sgr A* showing an angular shadow diameter d _sh = 48.7 ± 7 μ as and Schwarzschild shadow deviation $\delta =-{0.08}_{-0.09}^{+0.09}\,(\mathrm{VLTI})$ , $-{0.04}_{-0.10}^{+0.09}\,(\mathrm{Keck})$ using a black...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/acb695 |
| _version_ | 1797701487094136832 |
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| author | Sushant G. Ghosh Misba Afrin |
| author_facet | Sushant G. Ghosh Misba Afrin |
| author_sort | Sushant G. Ghosh |
| collection | DOAJ |
| description | The Event Horizon Telescope (EHT) recently released an image of the supermassive black hole Sgr A* showing an angular shadow diameter d _sh = 48.7 ± 7 μ as and Schwarzschild shadow deviation $\delta =-{0.08}_{-0.09}^{+0.09}\,(\mathrm{VLTI})$ , $-{0.04}_{-0.10}^{+0.09}\,(\mathrm{Keck})$ using a black hole mass $M={4.0}_{-0.6}^{+1.1}\times {10}^{6}\,{M}_{\odot }$ . The EHT image of Sgr A* is consistent with a Kerr black hole’s expected appearance, and the results directly prove the existence of a supermassive black hole at the center of the Milky Way. Here, we use the EHT observational results for Sgr A* to investigate the constraints on its charge with the aid of Kerr-like black holes, paying attention to three leading rotating models, namely Kerr–Newman, Horndeski, and hairy black holes. Modeling the supermassive black hole Sgr A* as these Kerr-like black holes, we observe that the EHT results for Sgr A* place stricter upper limits on the parameter space of Kerr–Newman and Horndeski black holes than those placed by the EHT results for M87*. A systematic bias analysis reveals that observational results from future EHT experiments will place more precise limits on the charge of the black hole Sgr A*. Thus, the Kerr-like black holes and Kerr black holes are indiscernible in a substantial region of the EHT-constrained parameter space; the claim is substantiated by our bias analysis. |
| first_indexed | 2024-03-12T04:36:25Z |
| format | Article |
| id | doaj.art-c967f15c41844a1db66818428cdbb0d0 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:36:25Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-c967f15c41844a1db66818428cdbb0d02023-09-03T09:55:20ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01944217410.3847/1538-4357/acb695An Upper Limit on the Charge of the Black Hole Sgr A* from EHT ObservationsSushant G. Ghosh0https://orcid.org/0000-0002-0835-3690Misba Afrin1https://orcid.org/0000-0001-5545-3507Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi 110025, India ; me.misba@gmail.com; Astrophysics and Cosmology Research Unit, School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal , Private Bag 54001, Durban 4000, South AfricaCentre for Theoretical Physics, Jamia Millia Islamia, New Delhi 110025, India ; me.misba@gmail.comThe Event Horizon Telescope (EHT) recently released an image of the supermassive black hole Sgr A* showing an angular shadow diameter d _sh = 48.7 ± 7 μ as and Schwarzschild shadow deviation $\delta =-{0.08}_{-0.09}^{+0.09}\,(\mathrm{VLTI})$ , $-{0.04}_{-0.10}^{+0.09}\,(\mathrm{Keck})$ using a black hole mass $M={4.0}_{-0.6}^{+1.1}\times {10}^{6}\,{M}_{\odot }$ . The EHT image of Sgr A* is consistent with a Kerr black hole’s expected appearance, and the results directly prove the existence of a supermassive black hole at the center of the Milky Way. Here, we use the EHT observational results for Sgr A* to investigate the constraints on its charge with the aid of Kerr-like black holes, paying attention to three leading rotating models, namely Kerr–Newman, Horndeski, and hairy black holes. Modeling the supermassive black hole Sgr A* as these Kerr-like black holes, we observe that the EHT results for Sgr A* place stricter upper limits on the parameter space of Kerr–Newman and Horndeski black holes than those placed by the EHT results for M87*. A systematic bias analysis reveals that observational results from future EHT experiments will place more precise limits on the charge of the black hole Sgr A*. Thus, the Kerr-like black holes and Kerr black holes are indiscernible in a substantial region of the EHT-constrained parameter space; the claim is substantiated by our bias analysis.https://doi.org/10.3847/1538-4357/acb695Astrophysical black holesBlack hole physicsGalactic centerGravitationGravitational lensing |
| spellingShingle | Sushant G. Ghosh Misba Afrin An Upper Limit on the Charge of the Black Hole Sgr A* from EHT Observations The Astrophysical Journal Astrophysical black holes Black hole physics Galactic center Gravitation Gravitational lensing |
| title | An Upper Limit on the Charge of the Black Hole Sgr A* from EHT Observations |
| title_full | An Upper Limit on the Charge of the Black Hole Sgr A* from EHT Observations |
| title_fullStr | An Upper Limit on the Charge of the Black Hole Sgr A* from EHT Observations |
| title_full_unstemmed | An Upper Limit on the Charge of the Black Hole Sgr A* from EHT Observations |
| title_short | An Upper Limit on the Charge of the Black Hole Sgr A* from EHT Observations |
| title_sort | upper limit on the charge of the black hole sgr a from eht observations |
| topic | Astrophysical black holes Black hole physics Galactic center Gravitation Gravitational lensing |
| url | https://doi.org/10.3847/1538-4357/acb695 |
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