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Metallicity evolution of AGNs from UV emission-lines

Dors, Oli L. et al · Wiley Blackwell Publishing, Inc · 2014

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Author / responsible party
Dors, Oli L. et al
Publisher
Wiley Blackwell Publishing, Inc
Year
2014
ISSN
1291-1300
ISSN
1291-1300
Language
English

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We analysed the evolution of the metallicity of the gas with the redshift for a sample of AGNs in a very wide redshift range (0 < z<4) using ultraviolet emission lines from the narrow-line regions (NLRs) and photoionization models. The new index C43 = log[(C IV+C III])/He II] is suggested as a metallicity indicator for AGNs. Based on this indicator, we confirmed the no metallicity evolution of NLRs with the redshift pointed out by previous works. We found that metallicity of AGNs shows similar evolution than the one predicted by cosmic semianalytic models of galaxy formation set within the cold dark matter merging hierarchy (for z < 3). Our results predict a mean metallicity for local objects in agreement with the solar value (12+log(O/H)=8.69). This value is about the same that the maximum oxygen abundance value derived for the central parts of local spiral galaxies. Very low metallicity log (Z/Zsun) ~ −0.8 for some objects in the range 1.5<z<3 is derived. Fil: Dors, Oli L.. Universidade do Vale do Paraíba; Brasil Fil: Cardaci, Monica Viviana. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina

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APA 7

Dors, O. L. E. A. (2014). Metallicity evolution of AGNs from UV emission-lines. http://hdl.handle.net/11336/35481

MLA

Dors, Oli L. et al. "Metallicity evolution of AGNs from UV emission-lines." 2014. http://hdl.handle.net/11336/35481.

Chicago

Dors, Oli L. et al. 2014. "Metallicity evolution of AGNs from UV emission-lines.". http://hdl.handle.net/11336/35481.

Harvard

Dors, O. L. E. A. 2014, Metallicity evolution of AGNs from UV emission-lines, Wiley Blackwell Publishing, Inc, available at: http://hdl.handle.net/11336/35481 [Accessed 7 Aug. 2026].

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Title
Metallicity evolution of AGNs from UV emission-lines
Author / contributors
Dors, Oli L. et al
Publisher
Wiley Blackwell Publishing, Inc
Publication year
2014
ISSN
1291-1300
ISSN
1291-1300
Language
English

Subjects

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Abundances (galaxias); Evolution of galaxies; Formation of galaxies; https://purl.org/becyt/ford/1.3; https://purl.org/becyt/ford/1
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