Mid Infrared Spectral Energy Distribution of NGC 1068 with 0.1 arcsec Spatial Resolution

Abstract

The central region of the Seyfert 2 galaxy NGC 1068 is imaged in the mid infrared (MIR) using the Mid-Infrared Test Observation System on the 8.2 m Subaru Telescope. The oversampling pixel scale associated with shift-and-add method shows 0.1 arcsec resolution images with a high dynamic range after deconvolution. Along with an extended structure at a position angle (P.A.) of -10 degrees with higher surface brightness, another structure extends wider with lower surface brightness at a P.A. of 20 degrees. The central peak elongates north-south with FWHM of 0.3 x 0.2 arcsec. Spectral energy distribution (SED) of the central peak is fitted to have the silicate absorption feature of tau_9.7um = 0.9 +/- 0.3. This is half of the absorption expected from the near-infrared (NIR) feature of carbonaceous dust. This suggests a temperature gradient of the absorbing dust along the line of sight. Another possibility, which is not distinguishable here, is the size distribution of dust different from our Galaxy. Intrinsic luminosity of emission from the central peak is 3 x 10^37 W. The SED shows a hint of the poly aromatic hydrocarbon (PAH) emission features. Although a high spatial resolution MIR spectrum is required, it suggests that the PAH carriers near the active galactic nuclei (AGNs) are sheltered from the high-energy emission from the AGNs and the AGNs have nuclear starbursts. For the NIR disklike structures, no counterparts are detected in the MIR. The nature of the structures remains unclear.

22 pages LaTeX, 5 postscript figures. Printed in ApJ, 2001, vol. 557, p.637. (C) 2001. The American Astronomical Society. All rights reserved

References in corpus (2)

• Absorption and Reddening in the Seyfert Galaxy NGC 3227
• Thermal Infrared 3--5 $\mu$m Colors of Obscured and Unobscured Active Galactic Nuclei

Cited by in corpus (37)

• Molecular line emission in NGC1068 imaged with ALMA. I An AGN-driven outflow in the dense molecular gas
• Resolving the mid-infrared cores of local Seyferts
• Dusty, Radiation Pressure Dominated Photoionization. I. Model Description, Structure And Grids
• Radiative Transfer Modeling of Three-Dimensional Clumpy AGN Tori and its Application to NGC 1068
• Torus and AGN properties of nearby Seyfert galaxies: Results from fitting IR spectral energy distributions and spectroscopy
• Dusty Structure Around Type-I Active Galactic Nuclei: Clumpy Torus Narrow Line Region and Near-Nucleus Hot Dust
• ALMA resolves the torus of NGC 1068: continuum and molecular line emission
• Parsec-scale dust emission from the polar region in the type 2 nucleus of NGC 424
• ALMA images the many faces of the NGC1068 torus and its surroundings
• Molecular gas streamers feeding and obscuring the active nucleus of NGC1068
• ALMA Reveals an Inhomogeneous Compact Rotating Dense Molecular Torus at the NGC 1068 Nucleus
• Spatially-resolved mid-infrared spectroscopy of NGC 1068: the nature and distribution of the nuclear material
• Silicate emissions in active galaxies - From LINERs to QSOs
• The spectral energy distribution of the central parsecs of the nearest AGN
• Revealing the large nuclear dust structures in NGC 1068 with MIDI/VLTI
• Extended silicate dust emission in PG QSOs
• Organic matter in Seyfert2 nuclei : comparison with our Galactic center lines of sight
• Mid-Infrared Imaging of Active Galaxies: Active Nuclei and Embedded Star Clusters
• ALMA 0.1-0.2 arcsec resolution imaging of the NGC 1068 nucleus - compact dense molecular gas emission at the putative AGN location
• The Galaxy Activity, Torus and Outflow Survey (GATOS): II. Torus and polar dust emission in nearby Seyfert galaxies
• Revisiting the location and environment of the central engine in NGC1068
• The emission and distribution of dust of the torus of NGC 1068
• High-Spatial Resolution SED of NGC 1068 from Near-IR to Radio. Disentangling the thermal and non-thermal contributions
• The Baldwin effect in the narrow emission lines of AGNs
• Investigating the sensitivity of observed spectral energy distributions to clumpy torus properties in Seyfert galaxies
• Hydrocarbon Dust Absorption in Seyfert Galaxies and ULIRGs
• Mid-infrared imaging of NGC1068 with VISIR at the VLT
• ALMA polarimetry measures magnetically aligned dust grains in the torus of NGC 1068
• Near-IR 2D-Spectroscopy of the 4''x 4'' region around the Active Galactic Nucleus of NGC1068 with ISAAC/VLT
• The First Spatially Resolved Mid-IR Spectra of NGC 1068 Obtained at Diffraction-limited Resolution with LWS at Keck I Telescope
• Mid-infrared imaging- and spectro-polarimetric subarcsecond observations of NGC 1068
• Spectropolarimetry of the 3.4 micron absorption feature in NGC 1068
• Distribution of dust clouds around the central engine of NGC 1068
• NGC 1068: No change in the mid-IR torus structure despite X-ray variability
• Mid-infrared interferometry of Seyfert galaxies: Challenging the Standard Model
• Classifying Radio Emitters from the Sloan Digital Sky Survey: Spectroscopy and Diagnostics
• The complex infrared dust continuum emission of NGC1068: ground-based N- and Q-band spectroscopy and new radiative transfer models