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Title:
Distribution of Dust Clouds around the Central Engine of NGC 1068
Authors:
Tomono, Daigo; Terada, Hiroshi; Kobayashi, Naoto
Affiliation:
AA(Subaru Telescope, National Astronomical Observatory of Japan, 650 North A`ohoku Place, Hilo, HI 96720; tomono@subaru.naoj.org), AB(Subaru Telescope, National Astronomical Observatory of Japan, 650 North A`ohoku Place, Hilo, HI 96720; tomono@subaru.naoj.org), AC(Institute of Astronomy, Graduate School of Science, University of Tokyo 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan)
Publication:
The Astrophysical Journal, Volume 646, Issue 2, pp. 774-782. (ApJ Homepage)
Publication Date:
08/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Active, Galaxies: Individual: NGC Number: NGC 1068, Galaxies: Nuclei, Galaxies: Seyfert, Infrared: Galaxies
DOI:
10.1086/505125
Bibliographic Code:
2006ApJ...646..774T

Abstract

We studied the distribution of dust clouds around the central engine of NGC 1068 based on shifted and added 8.8-12.3 μm (MIR) multifilter images and 3.0-3.9 μm (L-band) spectra obtained with the Subaru Telescope. In a region of 100 pc (1.4") around the central peak, we successfully constructed maps of color temperatures and emissivities of the MIR and L-band continua as well as the 9.7 and 3.4 μm dust features with spatial resolutions of 26 pc (0.37") in the MIR and 22 pc (0.3") in the L band. Our main results are the following: (1) The color temperature of the MIR continuum scatters around the thermal equilibrium temperature with the central engine as the heat source, while that of the L-band continuum is higher and independent of distance from the central engine. (2) The peak of the 9.7 μm silicate absorption feature is shifted to a longer wavelength at some locations. (3) The ratio of the optical depths of the dust features is different from the Galactic values and shows a complicated spatial distribution. (4) There is a pie-shaped warm dust cloud as an enhancement in the emissivity of the MIR continuum extending about 50 pc to the north from the central engine. We speculate that material falls into the central engine through this cloud.

Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.

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