Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Lanfranchi, Gustavo A. [1] ; Hazenfratz, Roberto [1] ; Caproni, Anderson [1] ; Silk, Joseph [2, 3, 4, 5]
Total Authors: 4
[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
Total Affiliations: 5
Document type: Journal article
Source: ASTROPHYSICAL JOURNAL; v. 914, n. 1 JUN 2021.
Web of Science Citations: 0

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)

FAPESP's process: 17/03173-4 - Gas removal in the Ursa Minor galaxy: linking hydrodynamics and chemical evolution models
Grantee:Anderson Caproni
Support type: Regular Research Grants - Publications - Scientific article
FAPESP's process: 17/25651-5 - Numerical studies of extragalactic objects in the local universe and at high redshifts
Grantee:Anderson Caproni
Support type: Regular Research Grants
FAPESP's process: 14/11156-4 - What drives the stellar mass growth of Early-Type galaxies? Born or made: the saga continues
Grantee:Reinaldo Ramos de Carvalho
Support type: Research Projects - Thematic Grants