NAGIOS: RODERIC FUNCIONANDO

Neutrino pair annihilation near accreting, stellar-mass black holes

Manakin: DSpace XMLUI Project v2

Neutrino pair annihilation near accreting, stellar-mass black holes

Mostrar información abreviada

dc.contributor.author Birkl, R.
dc.contributor.author Aloy Toras, Miguel Angel
dc.contributor.author Janka, H.-Th
dc.contributor.author Müller, E.
dc.date.accessioned 2010-08-10T10:55:56Z
dc.date.available 2010-08-10T10:55:56Z
dc.date.issued 2007
dc.identifier.uri http://hdl.handle.net/10550/16813
dc.description.abstract Context. We investigate the deposition of energy and momentum due to the annihilation of neutrinos (ν) and antineutrinos (¯ν) in the vicinity of steady, axisymmetric accretion tori around stellar-mass black holes (BHs). This process is widely considered as an energy source for driving ultrarelativistic outflows with the potential to produce gamma-ray bursts. Aims. We analyze the influence of general relativistic (GR) effects in combination with different neutrinosphere properties on the ν¯ν-annihilation efficiency and spatial distribution of the energy deposition rate. Methods. Assuming axial symmetry, we numerically compute the annihilation rate 4-vector. For this purpose, we construct the local neutrino distribution by ray-tracing neutrino trajectories in a Kerr space-time using null geodesics. We vary the value of the dimensionless specific angular momentum a of the central BH, which provides the gravitational field in our models. We also study different shapes of the neutrinospheres, spheres, thin disks, and thick accretion tori, whose structure ranges from idealized tori to equilibrium non-selfgravitating matter distributions. Furthermore, we compute Newtonian models where the influence of the gravitational field on the annihilation process is neglected. Results. Compared to Newtonian calculations, GR effects increase the total annihilation rate measured by an observer at infinity by a factor of two when the neutrinosphere is a thin disk, but the increase is only ≈25% for toroidal and spherical neutrinospheres. Comparing cases with similar luminosities, thin disk models yield the highest energy deposition rates by ν¯ν-annihilation, and spherical neutrinospheres the lowest ones, independently of whether GR effects are included. Increasing a from 0 to 1 enhances the energy deposition rate measured by an observer at infinity by roughly a factor of 2 due to the change of the inner radius of the neutrinosphere. General relativity and rotation cause important differences in the spatial distribution of the energy deposition rate by ν¯ν-annihilation. en
dc.language.iso en en
dc.relation http://www.aanda.org/articles/aa/pdf/2007/07/aa6293-06.pdf en
dc.source BIRKL, R. ; Aloy Toras, Miguel Angel ; Janka, H.-Th ; Müller, E. , 2007, Neutrino pair annihilation near accreting, stellar-mass black holes, Astronomy and Astrophysics, vol. 463, no. 1, p. 51-67 en
dc.subject Gamma rays ; Bursts ; Neutrinos ; Accretion ; Accretion disks ; Relativity ; Black hole physics ; Neutron en
dc.title Neutrino pair annihilation near accreting, stellar-mass black holes en
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia en
dc.identifier.doi 10.1051/0004-6361:20066293 en
dc.description.private Aloy Toras, Miguel Angell, Miguel.A.Aloy@uv.es en
dc.identifier.idgrec 035922 en
Descargar:       (8.543Mb)

Este documento aparece en la(s) siguiente(s) colección(ones)

Mostrar información abreviada

Buscar en RODERIC

Búsqueda avanzada

Listar

Mi cuenta

Estadísticas