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Diffraction-limited Imaging and Photometry of NGC 1068

Weinberger, A. J. and Neugebauer, G. and Matthews, K. (1999) Diffraction-limited Imaging and Photometry of NGC 1068. Astronomical Journal, 117 (6). pp. 2748-2756. ISSN 1538-3881. doi:10.1086/300865.

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The nearby Seyfert 2 galaxy NGC 1068 was observed with speckle imaging techniques in the near-infrared H band (1.6 μm) with the 200-inch Hale Telescope on Palomar Mountain and K band (2.2 μm) with the 10 m Keck I Telescope at the W. M. Keck Observatory. Images with diffraction-limited or near–diffraction-limited resolutions of 0”.05–0”.1 were obtained and used to search for structure in the nuclear region. Images of the nucleus of NGC 1068 reveal an extended region of emission, accounting for nearly 50% of the nuclear flux in the K band. This region extends 10 pc on either side of an unresolved point-source nucleus that is at most 0”.02 or 1.4 pc in size. Both the point source and the newly imaged extended emission are very red, with identical H-K colors corresponding to a color temperature of 800 K. While the point source is of a size to be consistent with grains in thermal equilibrium with the nuclear source, the extended emission is not. It must consist either of nuclear emission that has been reflected off an extended dusty disk or of small grains raised to transiently high temperatures by reflected UV photons.

Item Type:Article
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URLURL TypeDescription Paper
Weinberger, A. J.0000-0001-6654-7859
Additional Information:© 1999 The American Astronomical Society. Received 1998 July 15; accepted 1999 February 16. We thank Andrea Ghez for her help with the observations and data analysis, Tom Soifer for many helpful conversations on models of NGC 1068, and the telescope operators at the Palomar and Keck Observatories for their efforts during time-consuming speckle observing. Infrared astronomy at Caltech is supported by the NSF.
Funding AgencyGrant Number
Subject Keywords:Galaxies: individual (NGC 1068); infrared radiation; techniques: interferometric
Issue or Number:6
Record Number:CaltechAUTHORS:20170221-124813952
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Official Citation:A. J. Weinberger et al 1999 AJ 117 2748
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74427
Deposited By: Melissa Ray
Deposited On:21 Feb 2017 21:28
Last Modified:11 Nov 2021 05:27

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