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Constraints on the broad-line region properties and extinction in local Seyferts

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Constraints on the broad-line region properties and extinction in local Seyferts

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Título Constraints on the broad-line region properties and extinction in local Seyferts
Autor Schnorr Müller, Allan
Davies, Richard I.
Korista, Kirk T.
Burtscher, Leonard
Rosario, David
Storchi-Bergmann, Thaisa
Contursi, Alessandra
Genzel, Reinhard
Gracia-Carpio, Javier
Hicks, Erin K. S.
Janssen, Annemieke
Koss, Michael
Lin, Ming-Yi
Lutz, Dieter
Maciejewski, Witold B.
Muller-Sanchez, Francisco
Orban de Xivry, Gilles
Riffel, Rogério
Riffel, Rogemar André
Schartmann, Marc
Sternberg, Amiel
Sturm, Eckhard
Tacconi, Linda J.
Veilleux, Sylvain
Ulrich, Otho Adam
Abstract We use high-spectral resolution (R>8000) data covering 3800–13 000 Å to study the physical conditions of the broad-line region (BLR) of nine nearby Seyfert 1 galaxies. Up to six broad HI lines are present in each spectrum. A comparison – for the first time using simultaneous optical to near-infrared observations – to photoionization calculations with our devised simple scheme yields the extinction to the BLR at the same time as determining the density and photon flux, and hence distance from the nucleus, of the emitting gas. This points to a typical density for the HI emitting gas of 1011 cm−3 and shows that a significant amount of this gas lies at regions near the dust sublimation radius, consistent with theoretical predictions. We also confirm that in many objects, the line ratios are far from case B, the best-fitting intrinsic broad-line Hα/H β ratios being in the range 2.5–6.6 as derived with our photoionization modelling scheme. The extinction to the BLR, based on independent estimates from HI and He II lines, is AV ≤ 3 for Seyfert 1–1.5s, while Seyfert 1.8–1.9s have AV in the range 4–8.Acomparison of the extinction towards the BLR and narrow-line region (NLR) indicates that the structure obscuring the BLR exists on scales smaller than the NLR. This could be the dusty torus, but dusty nuclear spirals or filaments could also be responsible. The ratios between the X-ray absorbing column NH and the extinction to the BLR are consistent with the Galactic gas-to-dust ratio if NH variations are considered.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 462, no. 4 (Nov. 2016), p. 3570–3590
Assunto Galaxias seyfert
Nucleo galatico
Poeira cosmica
[en] Dust
[en] Extinction
[en] Galaxies: active
[en] Galaxies: ISM
[en] Galaxies: nuclei
[en] Galaxies: Seyfert
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/163729
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