J/MNRAS/468/L113 Nitrogen abundance of Seyfert 2 AGN (Dors+, 2017)
New quantitative nitrogen abundance estimations in a sample of Seyfert 2
active galactic nuclei.
Dors O.L.Jr, Arellano-Cordova K.Z., Cardaci M.V., Hagele G.F.
<Mon. Not. R. Astron. Soc., 468, L113-117 (2017)>
=2017MNRAS.468L.113D 2017MNRAS.468L.113D (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, Seyfert ; Active gal. nuclei ; Abundances
Keywords: galaxies: abundances - galaxies: evolution - galaxies: formation -
galaxies: ISM - galaxies: nuclei - galaxies: Seyfert
Abstract:
We obtained new quantitative determinations of the nitrogen abundance
and a consistent relation between the nitrogen and oxygen abundances
for a sample of Seyfert 2 galaxies located at redshift z<0.1. We
carried out this analysis using the CLOUDY code to build detailed
photoionization models. We were able to reproduce observed optical
narrow emission line intensities for 44 sources compiled from the
literature. Our results show that Seyfert 2 nuclei have nitrogen
abundances ranging from ∼0.3 to ∼7.5 times the solar value.
We derived the relation log
(N/H)=1.05(±0.09)x[log(O/H)]-0.35(±0.33). Results for N/O versus
O/H abundance ratios derived for Seyfert 2 galaxies are in consonance
with those recently derived for a sample of extragalactic disc HII
regions with high metallicity.
Description:
We compiled from the literature narrow optical emission line
intensities for a sample of Sy2s. Standard photoionization models were
built in order to reproduce the intensities of these emission lines.
We present new results of the nitrogen and oxygen abundances
calculated for a large sample of Sy2s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 45 Dereddened fluxes (relative to Hβ=1.00)
for a sample of Seyfert 2 nuclei
table2.dat 54 44 Assumed model parameter values used to fit the
emission lines observed in the 44 modeled
Seyfert 2 nuclei
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Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Object Object name
16- 20 F5.2 --- F[OII]O Observed dereddened [OII]3726,3729 flux
(relative to Hβ=100)
22- 25 F4.2 --- F[OII]M Predicted dereddened [OII]3726,3729 flux
(relative to Hβ=100) (1)
27- 31 F5.2 --- F[OIII]O Observed dereddened [OIII]5007 flux
(relative to Hβ=100)
33- 37 F5.2 --- F[OIII]M Predicted dereddened [OIII]5007 flux
(relative to Hβ=100) (1)
39- 42 F4.2 --- F[NII]O Observed dereddened [NII]6584 flux
(relative to Hβ=100)
44- 47 F4.2 --- F[NII]M Predicted dereddened [NII]6584 flux
(relative to Hβ=100) (1)
49- 52 F4.2 --- F[SII]O Observed dereddened [SII]7618+7631 flux
(relative to Hβ=100)
54- 57 F4.2 --- F[SII]M Predicted dereddened [SII]7618+7631 flux
(relative to Hβ=100) (1)
59- 64 F6.4 --- z Redshift (from NED)
66- 67 I2 --- Ref References (2)
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Note (1): the predicted values by the photoionization models
(see Sect. 3 of the paper).
Note (2): References as follows:
1 = Kraemer et al. (1994ApJ...435..171K 1994ApJ...435..171K)
2 = Contini et al. (2012MNRAS.425.1205C 2012MNRAS.425.1205C)
3 = Koski (1978ApJ...223...56K 1978ApJ...223...56K)
4 = Cohen (1983ApJ...273..489C 1983ApJ...273..489C)
5 = Alloin et al. (1992A&A...266..117A 1992A&A...266..117A)
6 = Schmitt et al. (1994ApJ...423..237S 1994ApJ...423..237S)
7 = Radovich & Rafanelli (1996A&A...306...97R 1996A&A...306...97R)
8 = Osterbrock (1981ApJ...249..462O 1981ApJ...249..462O)
9 = Phillips et al. (1983ApJ...266..485P 1983ApJ...266..485P)
10 = Goodrich & Osterbrock (1983ApJ...269..416G 1983ApJ...269..416G)
11 = Shuder (1980ApJ...240...32S 1980ApJ...240...32S )
12 = Durret & Bergeron (1988A&AS...75..273D 1988A&AS...75..273D)
13 = Shuder & Osterbrock (1981ApJ...250...55S 1981ApJ...250...55S)
14 = Dopita et al. (2015, Cat. J/ApJS/217/12)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Object Object name
16- 22 F7.4 [-] log(O/H) Abundance O/H
24- 30 F7.4 [-] log(N/H) Abundance N/H
32- 38 F7.4 [-] log(S/H) Abundance S/H
40- 43 I4 cm-3 Ne Electron density
45- 49 F5.2 [-] log[Q(H)] Number of ionizing photons
51- 54 F4.1 --- alpha alpha index, for Fν∝να
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Mar-2020