High Resolution Mid-Infrared Imaging of the Nucleus of NGC 1068

Details High Resolution Mid-Infrared Imaging of the Nucleus of NGC 1068 High Resolution Mid-Infrared Imaging of the Nucleus of NGC 1068

1998-07-03

arxiv.org/abs/astro-ph/9807035v1

Astronomy and Astrophysics

Astrophysics

accepted by Astrophysical Journal 29 June 1998, 18 pages, 2 figures

Scientific paper

10.1086/311559

We have obtained mid-infrared images of the nucleus of NGC 1068 from the Hale 5 m telescope at Mt. Palomar with diffraction-limited resolution and high sensitivity at 8.8, 10.3, and 12.5 microns. Deconvolved images show that the infrared emission extends north to south in the inner 2", consisting of a central peak, a component extending 1" north of the central source, a component extending 1" south of the central source, and several smaller structures located 1" to the northeast. The central peak is extended 0.4" N-S and unresolved (<= 0.2") E-W. We find that 50 +/- 5% of the flux emerges from the central 0.4" and that a single unresolved point source can account for only 27 +/- 5% of the total flux. However, if the central peak arises from optically thick emission, we estimate that the emitting region has a projected area >= 2 pc^2, and may thus contain a compact source such as a parsec-scale torus. We observe a correspondence between the northern extension and the northeastern sources appearing on the mid-infrared images and the [OIII] clouds A-C & E. We interpret the faint optical counterpart to the mid-infrared southern extension as being due to partial obscuration by the intervening disk of the host galaxy. The N-S extension of the mid-infrared emission coincides with one wall of the conical narrow line region and aligns with the N-S orientation of the radio jet close to the nucleus. We interpret the infrared emission as arising from optically thick dust lining the walls of the low density cavity formed by the radio jet and heated by radiation from the central source.

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