Determination of metallicity and chemical abundances in active galactic nuclei (C...
Metallicity determinations in AGNs observed with SDSS-IV MaNGA
Narrow-band photometry applications for galactic archaeology
| Full text | |
| Author(s): |
Oliveira Jr, C. B.
;
Krabbe, A. C.
;
Hernandez-Jimenez, J. A.
;
Dors Jr, O. L.
;
Zinchenko, I. A.
;
Haegele, G. F.
;
Cardaci, M., V
;
Monteiro, A. F.
Total Authors: 8
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 515, n. 4, p. 16-pg., 2022-08-23. |
| Abstract | |
The ionizing source of Low Ionization Nuclear Emission Regions (LINERs) is uncertain. Because of this, an empirical relation to determine the chemical abundances of these objects has not been proposed. In this work, for the first time, we derived two semi-empirical calibrations based on photoionization models to estimate the oxygen abundance of LINERS as a function of the N2 and O3N2 emission-line intensity ratios. These relations were calibrated using oxygen abundance estimations obtained by comparing the observational emission-line ratios of 43 LINER galaxies (taken from the MaNGA survey) and grids of photoionization models built with the CLOUDY code assuming post-Asymptotic Giant Branch (post-AGB) stars with different temperatures. We found that the oxygen abundance of LINERs in our sample is in the 8.48 less than or similar to 12 +log(O/H)less than or similar to 8.84 range, with a mean value of 12 + log(O/H)=8.65. We recommend the use of the N2 index to estimate the oxygen abundances of LINERs, since the calibration with this index presented a much smaller dispersion than the O3N2 index. In addition, the estimated metallicities are in good agreement with those derived by extrapolating the disk oxygen abundance gradients to the centre of the galaxies showing that the assumptions of the models are suitable for LINERs. We also obtained a calibration between the logarithm of the ionization parameter and the [OIII]/[OII] emission-line ratio. (AU) | |
| FAPESP's process: | 21/08920-8 - Interacting galaxies: new catalog with data from the S-Plus survey and characterization of physical properties with data from the Survey MaNGA. |
| Grantee: | Jose Andres Hernandez Jimenez |
| Support Opportunities: | Scholarships in Brazil - Technical Training Program - Technical Training |
| FAPESP's process: | 19/11934-0 - Chemical abundance in galaxies liner with SDSS-IV MaNGA |
| Grantee: | Celso Benedito de Oliveira Junior |
| Support Opportunities: | Scholarships in Brazil - Doctorate |