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Parameterizing the Outflow from a Central Black Hole in Dwarf Spheroidal Galaxies: A 3D Hydrodynamic Simulation

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Autor(es):
Lanfranchi, Gustavo A. [1] ; Hazenfratz, Roberto [1] ; Caproni, Anderson [1] ; Silk, Joseph [2, 3, 4, 5]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Cidade Sao Paulo, Nucleo Astrofis, R Galvao Bueno 868, Liberdade, BR-01506000 Sao Paulo, SP - Brazil
[2] Johns Hopkins Univ, Dept Phys & Astron, Homewood Campus, Baltimore, MD 21218 - USA
[3] Sorbonne Univ, UMR7095 CNRS, Inst Astrophys Paris, F-75014 Paris - France
[4] Sorbonne Univ, UPMC, F-75014 Paris - France
[5] Univ Oxford, Beecroft Inst Particle Astrophys & Cosmol, Dept Phys, Keble Rd, Oxford OX1 3RH - England
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: ASTROPHYSICAL JOURNAL; v. 914, n. 1 JUN 2021.
Citações Web of Science: 0
Resumo

Large galaxies harbor massive central black holes and their feedback exerts a substantial impact on their evolution. Recently, observations have suggested that dwarf galaxies might host black holes in their centers, but with lower masses (intermediate-mass black holes-IMBHs). The impact of IMBHs on the evolution of dwarf spheroidal galaxies (dSphs), however, has so far not been properly analyzed. In this work, we investigate the effects of an outflow from an IMBH on gas dynamics in dSphs by means of noncosmological, three-dimensional hydrodynamic simulations, letting the galactic gas distribution evolve over 3 Gyr under the influence of the IMBH's outflow and supernova feedback. All simulations have a numerical resolution of 20.0 pc cell(-1). Two scenarios are considered to infer differences in the propagation of the outflow, one with a homogeneous interstellar medium (ISM) and another one with inhomogeneities caused by supernova feedback. A minimal initial speed and a minimal initial density are required for the outflow to propagate, with the values depending on the conditions of the medium. In an unperturbed medium, the outflow propagates freely in both directions with the same velocity (lower than the initial one), removing a small fraction of gas from the galaxy (the exact fraction depends on the initial physical conditions of the outflow). However, in an inhomogeneous ISM, the impact of the outflow is substantially reduced, and its contribution to the removal of gas from the galaxy is almost negligible. (AU)

Processo FAPESP: 17/03173-4 - Gas removal in the Ursa Minor galaxy: linking hydrodynamics and chemical evolution models
Beneficiário:Anderson Caproni
Modalidade de apoio: Auxílio à Pesquisa - Publicações científicas - Artigo
Processo FAPESP: 17/25651-5 - Estudos numéricos de objetos extragalácticos no universo local e em altos redshifts
Beneficiário:Anderson Caproni
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 14/11156-4 - O que determina o crescimento da massa estelar de galáxias elípticas? Intrínseco ou ambiente: a saga contínua
Beneficiário:Reinaldo Ramos de Carvalho
Modalidade de apoio: Auxílio à Pesquisa - Temático