On the Nature of Angular Momentum Transport in Nonradiative Accretion Flows
The principles underlying a proposed class of black hole accretion models are examined. The flows are generally referred to as ``convection-dominated,'' and are characterized by inward transport of angular momentum by thermal convection and outward viscous transport, vanishing mass accreti...
| Main Authors: | , |
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| Formato: | Journal article |
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2002
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| _version_ | 1826275851567628288 |
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| author | Balbus, S Hawley, J |
| author_facet | Balbus, S Hawley, J |
| author_sort | Balbus, S |
| collection | OXFORD |
| description | The principles underlying a proposed class of black hole accretion models are examined. The flows are generally referred to as ``convection-dominated,'' and are characterized by inward transport of angular momentum by thermal convection and outward viscous transport, vanishing mass accretion, and vanishing local energy dissipation. We examine the viability of these ideas by explicitly calculating the leading order angular momentum transport of axisymmetric modes in magnetized, differentially rotating, stratified flows. The modes are destabilized by the generalized magnetorotational instability. There are no inward transporting modes at all unless the magnitude of the (imaginary) Brunt frequency is comparable to the epicyclic frequency, a condition requiring substantial levels of dissipation. When inward transporting modes do exist, they appear at long wavelengths, unencumbered by magnetic tension. Moreover, very general thermodynamic principles prohibit the complete recovery of irreversible dissipative energy losses, a central feature of convection-dominated models. Dissipation of the free energy of differential rotation inevitably requires outward angular momentum transport. Our results are in good agreement with global MHD simulations, which find significant levels of outward transport and energy dissipation, whether or not destabilizing entropy gradients are present. |
| first_indexed | 2024-03-06T23:05:06Z |
| format | Journal article |
| id | oxford-uuid:637faf2c-d5ea-40c1-8ce6-0c7c4c5d415f |
| institution | University of Oxford |
| last_indexed | 2024-03-06T23:05:06Z |
| publishDate | 2002 |
| record_format | dspace |
| spelling | oxford-uuid:637faf2c-d5ea-40c1-8ce6-0c7c4c5d415f2022-03-26T18:13:26ZOn the Nature of Angular Momentum Transport in Nonradiative Accretion FlowsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:637faf2c-d5ea-40c1-8ce6-0c7c4c5d415fSymplectic Elements at Oxford2002Balbus, SHawley, JThe principles underlying a proposed class of black hole accretion models are examined. The flows are generally referred to as ``convection-dominated,'' and are characterized by inward transport of angular momentum by thermal convection and outward viscous transport, vanishing mass accretion, and vanishing local energy dissipation. We examine the viability of these ideas by explicitly calculating the leading order angular momentum transport of axisymmetric modes in magnetized, differentially rotating, stratified flows. The modes are destabilized by the generalized magnetorotational instability. There are no inward transporting modes at all unless the magnitude of the (imaginary) Brunt frequency is comparable to the epicyclic frequency, a condition requiring substantial levels of dissipation. When inward transporting modes do exist, they appear at long wavelengths, unencumbered by magnetic tension. Moreover, very general thermodynamic principles prohibit the complete recovery of irreversible dissipative energy losses, a central feature of convection-dominated models. Dissipation of the free energy of differential rotation inevitably requires outward angular momentum transport. Our results are in good agreement with global MHD simulations, which find significant levels of outward transport and energy dissipation, whether or not destabilizing entropy gradients are present. |
| spellingShingle | Balbus, S Hawley, J On the Nature of Angular Momentum Transport in Nonradiative Accretion Flows |
| title | On the Nature of Angular Momentum Transport in Nonradiative Accretion
Flows |
| title_full | On the Nature of Angular Momentum Transport in Nonradiative Accretion
Flows |
| title_fullStr | On the Nature of Angular Momentum Transport in Nonradiative Accretion
Flows |
| title_full_unstemmed | On the Nature of Angular Momentum Transport in Nonradiative Accretion
Flows |
| title_short | On the Nature of Angular Momentum Transport in Nonradiative Accretion
Flows |
| title_sort | on the nature of angular momentum transport in nonradiative accretion flows |
| work_keys_str_mv | AT balbuss onthenatureofangularmomentumtransportinnonradiativeaccretionflows AT hawleyj onthenatureofangularmomentumtransportinnonradiativeaccretionflows |