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

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

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Título The nucleus of C16.16 : another case of a double-peaked active galactic nucleus
Autor Rodriguez-Ardila, Alberto
Pastoriza, Miriani Griselda
Bica, Eduardo Luiz Damiani
Maza, Jose
Resumo 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.
Contido em The astrophysical journal. Chicago. Vol. 463, no. 2, pt. 1 (June 1996), p. 522-527
Assunto Astrofisica extragalatica
Discos de acrecao
Espectros astronômicos
Galaxias seyfert
Nucleo galatico
[en] Galaxies: individual (C16.16)
[en] Galaxies: nuclei
[en] Galaxies: seyfert
[en] Line: profiles
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108767
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