Neutrino-dominated Relativistic Viscous Accretion Flows around Rotating Black Holes with Shocks
We investigate the relativistic, viscous, advective neutrino-dominated accretion flows (NDAFs) around rotating stellar-mass black holes, incorporating neutrino cooling. By adopting an effective potential to describe the spacetime geometry around the rotating black holes, we self-consistently solve t...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/adabc8 |
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| author | Amit Kumar Sayan Chakrabarti Santabrata Das |
| author_facet | Amit Kumar Sayan Chakrabarti Santabrata Das |
| author_sort | Amit Kumar |
| collection | DOAJ |
| description | We investigate the relativistic, viscous, advective neutrino-dominated accretion flows (NDAFs) around rotating stellar-mass black holes, incorporating neutrino cooling. By adopting an effective potential to describe the spacetime geometry around the rotating black holes, we self-consistently solve the governing NDAF equations to obtain global transonic accretion solutions. Our findings indicate that, depending on the model parameters, namely, energy ( ε ), angular momentum ( λ ), accretion rate ( $\dot{m}$ ), viscosity ( α ), and black hole spin ( a _k ), NDAFs may harbor standing shocks where the Rankine–Hugoniot shock conditions are satisfied. Utilizing these shock-induced NDAF solutions, we compute the neutrino luminosity ( L _ν ) and neutrino annihilation luminosity ( ${L}_{\nu \bar{\nu }}$ ) across a wide range of model parameters. We further calculate maximum neutrino luminosity ( ${L}_{\nu }^{{\rm{\max }}}$ ) and neutrino annihilation luminosity ( ${L}_{\nu \bar{\nu }}^{{\rm{\max }}}$ ), resulting in ${L}_{\nu }^{{\rm{\max }}}\sim 1{0}^{51-53}$ erg s ^−1 (10 ^48−51 erg s ^−1 ) and ${L}_{\nu \bar{\nu }}^{{\rm{\max }}}\sim 1{0}^{48-52}$ erg s ^−1 (10 ^42−49 erg s ^−1 ) for a _k = 0.99 (0.0). These findings suggest that shocked NDAF solutions are potentially promising to explain the energy output of gamma-ray bursts (GRBs). We employ our NDAF model formalism to elucidate ${L}_{\nu \bar{\nu }}^{{\rm{obs}}}$ for five GRBs with known redshifts and estimate their accretion rate ( $\dot{m}$ ) based on the spin ( a _k ) of the central source of the GRBs studied here. |
| format | Article |
| id | doaj-art-f985af8e8ce24105a499630b8a806bad |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-f985af8e8ce24105a499630b8a806bad2025-02-05T13:31:28ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198016810.3847/1538-4357/adabc8Neutrino-dominated Relativistic Viscous Accretion Flows around Rotating Black Holes with ShocksAmit Kumar0Sayan Chakrabarti1Santabrata Das2https://orcid.org/0000-0003-4399-5047Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India ; [email protected], [email protected], [email protected] Institute of Technology Guwahati , Guwahati 781039, Assam, India ; [email protected], [email protected], [email protected] Institute of Technology Guwahati , Guwahati 781039, Assam, India ; [email protected], [email protected], [email protected] investigate the relativistic, viscous, advective neutrino-dominated accretion flows (NDAFs) around rotating stellar-mass black holes, incorporating neutrino cooling. By adopting an effective potential to describe the spacetime geometry around the rotating black holes, we self-consistently solve the governing NDAF equations to obtain global transonic accretion solutions. Our findings indicate that, depending on the model parameters, namely, energy ( ε ), angular momentum ( λ ), accretion rate ( $\dot{m}$ ), viscosity ( α ), and black hole spin ( a _k ), NDAFs may harbor standing shocks where the Rankine–Hugoniot shock conditions are satisfied. Utilizing these shock-induced NDAF solutions, we compute the neutrino luminosity ( L _ν ) and neutrino annihilation luminosity ( ${L}_{\nu \bar{\nu }}$ ) across a wide range of model parameters. We further calculate maximum neutrino luminosity ( ${L}_{\nu }^{{\rm{\max }}}$ ) and neutrino annihilation luminosity ( ${L}_{\nu \bar{\nu }}^{{\rm{\max }}}$ ), resulting in ${L}_{\nu }^{{\rm{\max }}}\sim 1{0}^{51-53}$ erg s ^−1 (10 ^48−51 erg s ^−1 ) and ${L}_{\nu \bar{\nu }}^{{\rm{\max }}}\sim 1{0}^{48-52}$ erg s ^−1 (10 ^42−49 erg s ^−1 ) for a _k = 0.99 (0.0). These findings suggest that shocked NDAF solutions are potentially promising to explain the energy output of gamma-ray bursts (GRBs). We employ our NDAF model formalism to elucidate ${L}_{\nu \bar{\nu }}^{{\rm{obs}}}$ for five GRBs with known redshifts and estimate their accretion rate ( $\dot{m}$ ) based on the spin ( a _k ) of the central source of the GRBs studied here.https://doi.org/10.3847/1538-4357/adabc8AccretionHydrodynamicsBlack hole physicsShocks |
| spellingShingle | Amit Kumar Sayan Chakrabarti Santabrata Das Neutrino-dominated Relativistic Viscous Accretion Flows around Rotating Black Holes with Shocks The Astrophysical Journal Accretion Hydrodynamics Black hole physics Shocks |
| title | Neutrino-dominated Relativistic Viscous Accretion Flows around Rotating Black Holes with Shocks |
| title_full | Neutrino-dominated Relativistic Viscous Accretion Flows around Rotating Black Holes with Shocks |
| title_fullStr | Neutrino-dominated Relativistic Viscous Accretion Flows around Rotating Black Holes with Shocks |
| title_full_unstemmed | Neutrino-dominated Relativistic Viscous Accretion Flows around Rotating Black Holes with Shocks |
| title_short | Neutrino-dominated Relativistic Viscous Accretion Flows around Rotating Black Holes with Shocks |
| title_sort | neutrino dominated relativistic viscous accretion flows around rotating black holes with shocks |
| topic | Accretion Hydrodynamics Black hole physics Shocks |
| url | https://doi.org/10.3847/1538-4357/adabc8 |
| work_keys_str_mv | AT amitkumar neutrinodominatedrelativisticviscousaccretionflowsaroundrotatingblackholeswithshocks AT sayanchakrabarti neutrinodominatedrelativisticviscousaccretionflowsaroundrotatingblackholeswithshocks AT santabratadas neutrinodominatedrelativisticviscousaccretionflowsaroundrotatingblackholeswithshocks |