Emergence of hot corona and truncated disc in simulations of accreting stellar mass black holes

Autor(es)

Nemmen, Rodrigo ; Vemado, Artur ; Almeida, Ivan ; Garcia, Javier ; Motta, Pedro N.

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 531, n. 1, p. 10-pg., 2024-05-17.

Resumo

Stellar mass black holes in X-ray binaries (XRBs) are known to display different states characterized by different spectral and timing properties, understood in the framework of a hot corona coexisting with a thin accretion disc whose inner edge is truncated. There are several open questions related to the nature and properties of the corona, the thin disc, and dynamics behind the hard state. This motivated us to perform 2D hydrodynamical simulations of accretion flows onto a 10M(circle dot) black hole. We consider a two-temperature plasma, incorporate radiative cooling with bremmstrahlung, synchrotron, and Comptonization losses and approximate the Schwarzschild space-time via a pseudo-Newtonian potential. We varied the mass accretion rate in the range 0.02 <= M/M-Edd <= 0.35. Our simulations show the natural emergence of a colder truncated thin disc embedded in a hot corona, as required to explain the hard state of XRBs. We found that as M increases, the corona contracts and the inner edge of the thin disc gets closer to the event horizon. At a critical accretion rate 0.02 <= M-erit /M-Edd <= 0.06, the thin disc disappears entirely. We discuss how our simulations compare with XRB observations in the hard state. (AU)

• Processo FAPESP: 21/01563-5 - Simulações de buracos negros binários estelares
• Beneficiário: Pedro Naethe Motta
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 22/10460-8 - Como os jatos de buracos negros são ativados?
• Beneficiário: Rodrigo Nemmen da Silva
• Modalidade de apoio: Bolsas no Exterior - Pesquisa
• Processo FAPESP: 17/01461-2 - O universo extremo: buracos negros e o telescópio Fermi
• Beneficiário: Rodrigo Nemmen da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 22/07456-9 - Simulações de buracos negros binários estelares
• Beneficiário: Pedro Naethe Motta
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Mestrado
• Processo FAPESP: 17/25710-1 - Resfriamento radiativo no ambiente de buracos negros
• Beneficiário: Artur Vemado
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 19/10054-7 - Ventos e feedback de buracos negros
• Beneficiário: Ivan Carlos de Almeida
• Modalidade de apoio: Bolsas no Brasil - Doutorado