Bibcode
Sánchez Almeida, J.; Caon, N.; Muñoz-Tuñón, C.; Filho, M.; Cerviño, M.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 476, Issue 4, p.4765-4781
Fecha de publicación:
6
2018
Número de citas
25
Número de citas referidas
22
Descripción
Using a representative sample of 14 star-forming dwarf galaxies in the
local Universe, we show the existence of a spaxel-to-spaxel
anticorrelation between the index N2 ≡ log ([N II]λ 6583/H
α ) and the H α flux. These two quantities are commonly
employed as proxies for gas-phase metallicity and star formation rate
(SFR), respectively. Thus, the observed N2 to H α relation may
reflect the existence of an anticorrelation between the metallicity of
the gas forming stars and the SFR it induces. Such an anticorrelation is
to be expected if variable external metal-poor gas fuels the
star-formation process. Alternatively, it can result from the
contamination of the star-forming gas by stellar winds and SNe, provided
that intense outflows drive most of the metals out of the star-forming
regions. We also explore the possibility that the observed
anticorrelation is due to variations in the physical conditions of the
emitting gas, other than metallicity. Using alternative methods to
compute metallicity, as well as previous observations of H II regions
and photoionization models, we conclude that this possibility is
unlikely. The radial gradient of metallicity characterizing disc
galaxies does not produce the correlation either.
Proyectos relacionados
Grupo de Estudios de Formación Estelar GEFE
El proyecto interno GEFE está enmarcado en el proyecto coordinado, ESTALLIDOS, financiado por el plan nacional desde el año 2001. El ultimo proyecto aprobado es ESTALLIDOS 6.0 (AYA2016- 79724-C4-2-P). En el proyecto GEFE trabajamos en base al caso científico del proyecto ESTALLIDOS 6.0. Los estallidos de formación estelar (Starbursts o SB) son
Casiana
Muñoz Tuñón