Effective temperature of ionizing stars in extragalactic H II regions : II. Nebular parameter relationships based on CALIFA data

We calculate the effective temperature (T<sub>eff</sub>) of ionizing star(s), the oxygen abundance of the gas phase (O/H)⁠, and the ionization parameter U for a sample of H II regions located in the discs of 59 spiral galaxies in the redshift range 0.005 < z < 0.03. We use spectros...

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Autores principales: Zinchenko, Igor A., Dors, Oli L., Hägele, Guillermo Federico, Cardaci, Mónica Viviana, Krabbe, Angela
Formato: Articulo
Lenguaje:Inglés
Publicado: 2018
Materias:
Ciencias Astronómicas
Física
galaxies: abundances
ISM: abundances
H II regions
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124566
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124566
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Física
galaxies: abundances
ISM: abundances
H II regions
spellingShingle Ciencias Astronómicas
Física
galaxies: abundances
ISM: abundances
H II regions
Zinchenko, Igor A.
Dors, Oli L.
Hägele, Guillermo Federico
Cardaci, Mónica Viviana
Krabbe, Angela
Effective temperature of ionizing stars in extragalactic H II regions : II. Nebular parameter relationships based on CALIFA data
topic_facet Ciencias Astronómicas
Física
galaxies: abundances
ISM: abundances
H II regions
description We calculate the effective temperature (T<sub>eff</sub>) of ionizing star(s), the oxygen abundance of the gas phase (O/H)⁠, and the ionization parameter U for a sample of H II regions located in the discs of 59 spiral galaxies in the redshift range 0.005 < z < 0.03. We use spectroscopic data taken from the CALIFA data release 3 (DR3) and theoretical (for T<sub>eff</sub> and U) and empirical (for O/H) calibrations based on strong emission lines. We consider the spatial distribution and radial gradients of these parameters in each galactic disc for the objects in our sample. Most of the galaxies in our sample (∼70 per cent) show positive T<sub>eff</sub> radial gradients, although some exhibit negative or flat ones. The median value of the T<sub>eff</sub> radial gradient is 0.762 kK/R25. We find that the radial gradients of both log U and T<sub>eff</sub> depend on the oxygen abundance gradient, in the sense that the gradient of log U increases as the log(O/H) gradient increases while there is an anti-correlation between the gradient of T<sub>eff</sub> and the oxygen abundance gradient. Moreover, galaxies with flat oxygen abundance gradients tend to have flat log U and T<sub>eff</sub> gradients as well. Although our results are in agreement with the idea of the existence of positive T<sub>eff</sub> gradients along the disc of the majority of spiral galaxies, it seems that this is not a universal property for these objects.
format Articulo
Articulo
author Zinchenko, Igor A.
Dors, Oli L.
Hägele, Guillermo Federico
Cardaci, Mónica Viviana
Krabbe, Angela
author_facet Zinchenko, Igor A.
Dors, Oli L.
Hägele, Guillermo Federico
Cardaci, Mónica Viviana
Krabbe, Angela
author_sort Zinchenko, Igor A.
title Effective temperature of ionizing stars in extragalactic H II regions : II. Nebular parameter relationships based on CALIFA data
title_short Effective temperature of ionizing stars in extragalactic H II regions : II. Nebular parameter relationships based on CALIFA data
title_full Effective temperature of ionizing stars in extragalactic H II regions : II. Nebular parameter relationships based on CALIFA data
title_fullStr Effective temperature of ionizing stars in extragalactic H II regions : II. Nebular parameter relationships based on CALIFA data
title_full_unstemmed Effective temperature of ionizing stars in extragalactic H II regions : II. Nebular parameter relationships based on CALIFA data
title_sort effective temperature of ionizing stars in extragalactic h ii regions : ii. nebular parameter relationships based on califa data
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/124566
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bdutipo_str Repositorios
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