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The dusty nuclear torus in NGC 4151 : constraints from gemini near-infrared integral field spectrograph observations

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The dusty nuclear torus in NGC 4151 : constraints from gemini near-infrared integral field spectrograph observations

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Título The dusty nuclear torus in NGC 4151 : constraints from gemini near-infrared integral field spectrograph observations
Autor Riffel, Rogemar André
Storchi-Bergmann, Thaisa
McGregor, Peter J.
Abstract We have used a near-infrared (near-IR) nuclear spectrum (covering the Z, J, H, and K bands) of the nucleus of NGC 4151 obtained with the Gemini Near-Infrared Integral Field Spectrograph (NIFS) and adaptive optics, to isolate and constrain the properties of a near-IR unresolved nuclear source whose spectral signature is clearly present in our data. The near-IR spectrumwas combined with an optical spectrum obtained with the Space Telescope Imaging Spectrograph which was used to constrain the contribution of a power-law component. After subtraction of the power-law component, the near-IR continuum is well fitted by a blackbody function, with T = 1285 ± 50 K, which dominates the nuclear spectrum—within an aperture of radius 0".3—in the near-IR. We attribute the blackbody component to emission by a dusty structure, with hot dust mass MHD = (6.9 ± 1.5) × 10−4 Mʘ , not resolved by our observations, which provide only an upper limit for its distance from the nucleus of 4 pc. If the reddening derived for the narrow-line region also applies to the near-IR source, we obtain a temperature T = 1360±50 K and a mass MHD = (3.1±0.7)×10−4 Mʘ for the hot dust. This structure may be the inner wall of the dusty torus postulated by the unified model or the inner part of a dusty wind originating in the accretion disk.
Contido em The astrophysical journal. Bristol. Vol. 698, no. 2 (June 2009), p. 1767-1770
Assunto Galaxias seyfert
Materia interestelar
Nucleo galatico
Poeira cosmica
[en] Galaxies: active
[en] Galaxies: individual (NGC 4151)
[en] Galaxies: ISM
[en] Galaxies: nuclei
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108980
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