Neutrino-dominated relativistic viscous accretion flows around rotating black holes with shocks
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arXiv
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2025
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| author | Kumar, Amit Chakrabarti, Sayan Das, Santabrata |
| author_facet | Kumar, Amit Chakrabarti, Sayan Das, Santabrata |
| contents | 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 ($\varepsilon$), angular momentum ($λ$), accretion rate ($\dot{m}$), viscosity ($α$) and black hole spin ($a_{\rm k}$), NDAFs may harbor standing shocks where the Rankine-Hugoniot shock conditions (RHCs) are satisfied. Utilizing these shock-induced NDAF solutions, we compute the neutrino luminosity ($L_ν$) and neutrino annihilation luminosity ($L_{ν\barν}$) across a wide range of model parameters. We further calculate maximum neutrino luminosity ($L_ν^{\rm max}$) and neutrino annihilation luminosity ($L_{ν\barν}^{\rm max}$) resulting in $L_ν^{\rm max} \sim 10^{51-53}$ erg s$^{-1}$ ($10^{48-51}$ erg s$^{-1}$) and $L_{ν\barν}^{\rm max} \sim 10^{48-52}$ erg s$^{-1}$ ($10^{42-49}$ erg s$^{-1}$) for $a_{\rm k}=0.99$ (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 $L^{\rm obs}_{ν\barν}$ for five GRBs with known redshifts and estimate their accretion rate (${\dot m}$) based on the spin ($a_{\rm k}$) of the central source of GRBs under consideration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_07080 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Neutrino-dominated relativistic viscous accretion flows around rotating black holes with shocks Kumar, Amit Chakrabarti, Sayan Das, Santabrata High Energy Astrophysical Phenomena 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 ($\varepsilon$), angular momentum ($λ$), accretion rate ($\dot{m}$), viscosity ($α$) and black hole spin ($a_{\rm k}$), NDAFs may harbor standing shocks where the Rankine-Hugoniot shock conditions (RHCs) are satisfied. Utilizing these shock-induced NDAF solutions, we compute the neutrino luminosity ($L_ν$) and neutrino annihilation luminosity ($L_{ν\barν}$) across a wide range of model parameters. We further calculate maximum neutrino luminosity ($L_ν^{\rm max}$) and neutrino annihilation luminosity ($L_{ν\barν}^{\rm max}$) resulting in $L_ν^{\rm max} \sim 10^{51-53}$ erg s$^{-1}$ ($10^{48-51}$ erg s$^{-1}$) and $L_{ν\barν}^{\rm max} \sim 10^{48-52}$ erg s$^{-1}$ ($10^{42-49}$ erg s$^{-1}$) for $a_{\rm k}=0.99$ (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 $L^{\rm obs}_{ν\barν}$ for five GRBs with known redshifts and estimate their accretion rate (${\dot m}$) based on the spin ($a_{\rm k}$) of the central source of GRBs under consideration. |
| title | Neutrino-dominated relativistic viscous accretion flows around rotating black holes with shocks |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2501.07080 |