| Full text | |
| Author(s): |
Dors, Jr., Oli L.
[1]
;
Cardaci, Monica V.
[2, 3]
;
Haegele, Guillermo F.
[2, 3]
;
Krabbe, Angela C.
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP - Brazil
[2] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF - Argentina
[3] Natl Univ La Plata, Fac Ciencias Astron & Geofis, RA-1900 La Plata - Argentina
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 443, n. 2, p. 1291-1300, SEP 11 2014. |
| Web of Science Citations: | 20 |
| Abstract | |
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{[}(CIV+CIII])/HeII] 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 semi-analytic models of galaxy formation set within the cold dark matter merging hierarchy (for z less than or similar to 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/Z(circle dot)) approximate to -0.8 for some objects in the range 1.5 < z < 3 is derived. (AU) | |
| FAPESP's process: | 10/01490-3 - Interacting galaxies: effects in the stellar population and the physical properties of the ionized gas |
| Grantee: | Angela Cristina Krabbe |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 09/14787-7 - Physical properties of star formation regions in circumnuclear rings and in (U)LIRGs |
| Grantee: | Oli Luiz Dors Junior |
| Support Opportunities: | Research Grants - Young Investigators Grants |