Chavushyan, Vahram H.; León-Tavares, Jonathan; Jiménez-Bailón, Elena; López-Martín, L.; Martínez, Benoni; Cruz-González, Irene; Fuentes-Carrera, Isaura; Méndez-Abreu, J.; Benítez, Erika
Bibliographical reference
The Astrophysical Journal, Volume 763, Issue 1, article id. 36, 13 pp. (2013).
Description
A sample of 10 nearby intermediate-type active galactic nuclei (AGNs)
drawn from the Sloan Digital Sky Survey is presented. The aim of this
work is to provide estimations of the black hole (BH) mass for the
sample galaxies from the dynamics of the broad-line region. For this
purpose, a detailed spectroscopic analysis of the objects was done.
Using Baldwin-Phillips-Terlevich diagnostic diagrams, we have carefully
classified the objects as true intermediate-type AGNs and found that
80%+7.2% –17.3% are composite AGNs. The BH
mass estimated for the sample is within 6.54 ± 0.16 < log M
BH < 7.81 ± 0.14. Profile analysis shows that five
objects (J120655.63+501737.1, J121607.08+504930.0, J141238.14+391836.5,
J143031.18+524225.8, and J162952.88+242638.3) have narrow double-peaked
emission lines in both the red (Hα, [N II]
λλ6548,6583 and [S II] λλ6716, 6731) and the
blue (Hβ and [O III] λλ4959, 5007) regions of the
spectra, with velocity differences (ΔV) between the double peaks
within 114 km s–1 <ΔV < 256 km
s–1. Two of them, J121607.08+504930.0 and
J141238.14+391836.5, are candidates for dual AGNs since their
double-peaked emission lines are dominated by AGN activity. In searches
of dual AGNs, type 1, type II, and intermediate-type AGNs should be
carefully separated, due to the high serendipitous number of narrow
double-peaked sources (50% ± 14.4%) found in our sample.
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