The nucleus of C16.16 : another case of a double-peaked active galactic nucleus

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Date
1996Type
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Abstract in Portuguese (Brasil)
We study optical spectra in high and low activity states of the faint, distant Seyfert 1 galaxy C16.16. A strong stellar population contribution to the continuum is observed, even in the high-state spectrum. The low-ionization emission lines show large equivalent widths. Narrow-line ratios are used to parameterize and investigate the physical conditions in the narrow-line region. Photoionization models with nitrogen depletion, ionization continuum typical of an active galactic nucleus (AGN), an ...
We study optical spectra in high and low activity states of the faint, distant Seyfert 1 galaxy C16.16. A strong stellar population contribution to the continuum is observed, even in the high-state spectrum. The low-ionization emission lines show large equivalent widths. Narrow-line ratios are used to parameterize and investigate the physical conditions in the narrow-line region. Photoionization models with nitrogen depletion, ionization continuum typical of an active galactic nucleus (AGN), and an ionization parameter U = 10 -2.8 reproduce the observed narrow lines. The AGN continuum shows a strong variation, while the Balmer lines vary moderately. The Balmer lines have a broad and asymmetric component with double-peaked structure. Using the profiles of emission lines originated in a relativistic circular disk, we successfully fit the observed broad Hα profile. This disk component shows no variation in the observations. A variable, intermediate-width (~6000 km s-ˡ) Balmer component is also found. These two com ponents seem to arise by different processes. ...
In
The astrophysical journal. Chicago. Vol. 463, no. 2, pt. 1 (June 1996), p. 522-527
Source
Foreign
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Journal Articles (35809)Exact and Earth Sciences (5620)
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