Metal content in the central region of galaxies

Accurate abundance determinations for the central regions of a great amount of galaxies would be necessary to improve the calibration of abundances in the over solar regime. Circumnuclear Star Forming Regions (CNSFRs) in early type galaxies, being close to the galactic nuclei, arc expected to be of...

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Autores principales: Cardaci, Mónica Viviana, Hägele, Guillermo Federico, Díaz, Ángeles I., Rodriguez-Pascual, Pedro, Santos-Lleó, María, Dors, Oli L.
Formato: Objeto de conferencia
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Astronómicas
Metal
galaxies
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/165643
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-165643
record_format dspace
spelling I19-R120-10915-1656432024-05-03T20:06:41Z http://sedici.unlp.edu.ar/handle/10915/165643 Metal content in the central region of galaxies Cardaci, Mónica Viviana Hägele, Guillermo Federico Díaz, Ángeles I. Rodriguez-Pascual, Pedro Santos-Lleó, María Dors, Oli L. 2016-11 2018 2024-05-03T18:58:58Z en Ciencias Astronómicas Metal galaxies Accurate abundance determinations for the central regions of a great amount of galaxies would be necessary to improve the calibration of abundances in the over solar regime. Circumnuclear Star Forming Regions (CNSFRs) in early type galaxies, being close to the galactic nuclei, arc expected to be of high metal content and in fact empirical abundance indicators constructed with strong optical emission lines point to oversolar abundances up to 3 times solar. Due to the difficulty in deriving abundances directly the calibrations have to be provided by theoretical photoionization models which require several assumptions to be made. Different models/assumptions provide different calibrations. The optical observational analysis of the warm ionized gas of CNSFRs yields oxygen abundances lower than expected from empirical abundance indicators. These findings point to a deficiency of light alpha elements (O, Ne) in the central regions of M82. If this is common among regions dominated by recent star formation, the estimated oxygen abundances might not be representative of the true metal content of these regions. This could have a profound effect on abundance calibrations leading to fundamental relations like the Mass-Metallicity and Luminosity-Metallicity relations. X-ray emission analysis can provide abundances for the hot gas phase. This hot plasma is thought to be mainly heated by the super novae explosions so that the X-ray gas should trace the current abundances of the galaxies. These alternative estimations of the metal content of the central region of galaxies would provide new observational constrains for models of chemical evolution. Facultad de Ciencias Astronómicas y Geofísicas Objeto de conferencia Objeto de conferencia http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 59-67
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Metal
galaxies
spellingShingle Ciencias Astronómicas
Metal
galaxies
Cardaci, Mónica Viviana
Hägele, Guillermo Federico
Díaz, Ángeles I.
Rodriguez-Pascual, Pedro
Santos-Lleó, María
Dors, Oli L.
Metal content in the central region of galaxies
topic_facet Ciencias Astronómicas
Metal
galaxies
description Accurate abundance determinations for the central regions of a great amount of galaxies would be necessary to improve the calibration of abundances in the over solar regime. Circumnuclear Star Forming Regions (CNSFRs) in early type galaxies, being close to the galactic nuclei, arc expected to be of high metal content and in fact empirical abundance indicators constructed with strong optical emission lines point to oversolar abundances up to 3 times solar. Due to the difficulty in deriving abundances directly the calibrations have to be provided by theoretical photoionization models which require several assumptions to be made. Different models/assumptions provide different calibrations. The optical observational analysis of the warm ionized gas of CNSFRs yields oxygen abundances lower than expected from empirical abundance indicators. These findings point to a deficiency of light alpha elements (O, Ne) in the central regions of M82. If this is common among regions dominated by recent star formation, the estimated oxygen abundances might not be representative of the true metal content of these regions. This could have a profound effect on abundance calibrations leading to fundamental relations like the Mass-Metallicity and Luminosity-Metallicity relations. X-ray emission analysis can provide abundances for the hot gas phase. This hot plasma is thought to be mainly heated by the super novae explosions so that the X-ray gas should trace the current abundances of the galaxies. These alternative estimations of the metal content of the central region of galaxies would provide new observational constrains for models of chemical evolution.
format Objeto de conferencia
Objeto de conferencia
author Cardaci, Mónica Viviana
Hägele, Guillermo Federico
Díaz, Ángeles I.
Rodriguez-Pascual, Pedro
Santos-Lleó, María
Dors, Oli L.
author_facet Cardaci, Mónica Viviana
Hägele, Guillermo Federico
Díaz, Ángeles I.
Rodriguez-Pascual, Pedro
Santos-Lleó, María
Dors, Oli L.
author_sort Cardaci, Mónica Viviana
title Metal content in the central region of galaxies
title_short Metal content in the central region of galaxies
title_full Metal content in the central region of galaxies
title_fullStr Metal content in the central region of galaxies
title_full_unstemmed Metal content in the central region of galaxies
title_sort metal content in the central region of galaxies
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/165643
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AT hageleguillermofederico metalcontentinthecentralregionofgalaxies
AT diazangelesi metalcontentinthecentralregionofgalaxies
AT rodriguezpascualpedro metalcontentinthecentralregionofgalaxies
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