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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Evolution of M82-like starburst winds revisited: 3D radiative cooling hydrodynamical simulations

Texto completo
Melioli, C. [1] ; de Gouveia Dal Pino, E. M. [1] ; Geraissate, F. G. [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, IAG, Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 430, n. 4, p. 3235-3248, APR 2013.
Citações Web of Science: 24

In this study we present three-dimensional radiative cooling hydrodynamical simulations of galactic winds generated particularly in M82-like starburst galaxies. We have considered intermittent winds induced by supernova (SN) explosions within super star clusters randomly distributed (in space and time) in the central region of the galaxy (within a radius of R = 150 pc) and were able to reproduce the observed M82 wind conditions with its complex morphological outflow structure. We have found that the environmental conditions in the disc in the nearly recent past are crucial to determine whether the wind will develop a large-scale rich filamentary structure, as in M82 wind, or not. If a sufficiently large number of super stellar clusters are built up in a starburst mainly over a period of a few million years, then the simulations reproduce the multiphase gas observed in M82-like winds, i.e. with filaments of sizes about 20-300 pc, velocities of similar to 200-500 km s(-1), densities in the range 10(-1)-10 cm(-3), embedded in a hot, low-density gas with a density smaller than 10(-2) cm(-3) and a velocity of similar to 2000 km s(-1). Otherwise, a `superbubble-like' wind develops, with very poor or no cold filamentary structures. Also, the numerical evolution of the SN ejecta has allowed us to obtain the abundance distribution over the first similar to 3 kpc extension of the wind and we have found that the SN explosions change significantly the metallicity only of the hot, low-density wind component for which we obtained abundances similar to 5-10 Z(circle dot) in fair consistency with the observations. Moreover, we have found that the SN-driven wind transports to outside the disc large amounts of energy, momentum and gas, but the more massive high-density component reaches only intermediate altitudes smaller than 1.5 kpc. Therefore, no significant amounts of gas mass are lost to the intergalactic medium and the mass evolution of the galaxy is not much affected by the starburst events occurring in the nuclear region. (AU)

Processo FAPESP: 06/50654-3 - Investigação de fenômenos de altas energias e plasmas astrofísicos: teoria, observação e simulações numéricas
Beneficiário:Elisabete Maria de Gouveia Dal Pino
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 11/22078-6 - Conexão entre a evolução de galáxias e formação estelar: das escalas de pc até escalas de kpc
Beneficiário:Claudio Melioli
Linha de fomento: Bolsas no Brasil - Pós-Doutorado