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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

On the central abundances of active galactic nuclei and star-forming galaxies

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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
[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

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