| Full text | |
| Author(s): |
Dors, Jr., O. L.
[1]
;
Cardaci, M. V.
[2]
;
Haegele, G. F.
[2]
;
Rodrigues, I.
[1]
;
Grebel, E. K.
[3]
;
Pilyugin, L. S.
[3, 4, 5]
;
Freitas-Lemes, P.
[1]
;
Krabbe, A. C.
[1]
Total Authors: 8
|
| Affiliation: | [1] Univ Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP - Brazil
[2] Univ Nacl La Plata, Fac Ciencias Astron & Geofis, RA-1900 La Plata - Argentina
[3] Heidelberg Univ, Astron Rechen Inst, Zentrum Astron, D-69120 Heidelberg - Germany
[4] Natl Acad Sci Ukraine, Main Astron Observ, UA-03680 Kiev - Ukraine
[5] Kazan Fed Univ, Kazan 420008 - Russia
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 453, n. 4, p. 4102-4111, NOV 11 2015. |
| Web of Science Citations: | 11 |
| Abstract | |
We examine the relation between oxygen abundances in the narrow-line regions (NLRs) of active galactic nuclei (AGNs) estimated from the optical emission lines through the strong-line method, via the direct Te-method, and the central intersect abundances in the host galaxies determined from the radial abundance gradients. We found that the Te-method underestimates the oxygen abundances by up to similar to 2 dex (with averaged value of similar to 0.8 dex) compared to the abundances derived through the strong-line method. This confirms the existence of the so-called `temperature problem' in AGNs. We also found that the abundances in the centres of galaxies obtained from their spectra trough the strong-line method are close to or slightly lower than the central intersect abundances estimated from the radial abundance gradient both in AGNs and star-forming galaxies. The oxygen abundance of the NLR is usually lower than the maximum attainable abundance in galaxies (similar to 2 times the solar value). This suggests that there is no extraordinary chemical enrichment of the NLRs of AGNs. (AU) | |
| 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 type: | Research Grants - Young Investigators Grants |
| 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 type: | Research Grants - Young Investigators Grants |