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Date and Time of the Query: 2019-06-16 T14:03:02 PDT
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For refcode 2009ApJ...698.1767R:
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Copyright by American Astronomical Society. Reproduced by permission
2009ApJ...698.1767R The Dusty Nuclear Torus in NGC 4151: Constraints from Gemini Near-Infrared Integral Field Spectrograph Observations Riffel, Rogemar A.; 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 spectrum was 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 M_HD_ = (6.9 +/- 1.5) x 10^--4^ M_sun_, 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 M_HD_ = (3.1 +/- 0.7) x 10^--4^ M_sun_ 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. Key words: galaxies: active, galaxies: individual: NGC 4151, galaxies: ISM, galaxies: nuclei
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