High Angular Resolution Imaging of the Nucleus of NGC 1068 at 10 Microns

Details High Angular Resolution Imaging of the Nucleus of NGC 1068 at 10 Microns High Angular Resolution Imaging of the Nucleus of NGC 1068 at 10 Microns

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.0404w&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #04.04; Bulletin of the American Astronomical Society, Vol. 28, p.824

Astronomy and Astrophysics

Astronomy

Scientific paper

We have imaged the nuclear region of the Seyfert Galaxy NGC 1068 in the 10 mu m region, using the JPL-developed 10 mu m camera, MIRLIN, on the 5-m Hale telescope at Mt. Palomar. MIRLIN uses a 128x128 Si:As IBC array provided by Rockwell. The large well depth of the individual pixels allows observations to be made with high throughput and broad spectral bandwidths. For the observations of NGC 1068, the pixel size was 0.15 arcsec, and images were obtained at 8.8, 10.3, and 12.5 mu m [bandwidth ~ 1mu m]. At each wavelength, the observed shift-and-added image shows a definite N-S elongation. Images of the standard stars alpha Tau and beta And were obtained at all three wavelengths and used for flux calibration and to establish a PSF template for deconvolution. The images were deconvolved using a Bayesian estimator which provided superresolution from the incorporation of prior information consisting of a positivity constraint. The independently obtained and deconvolved images are essentially identical at the three wavelengths, showing a bright <_ ~ 0.2 x 0.6 arcsec central core with its long axis in the N-S direction, embedded in a narrow ridge of emission which is elongated by about 1.5 arcsec in the N-S direction but is less than 0.5 arcsec in E-W extent. Lower surface brightness emission is seen at each wavelength to the N-E of the central core. The results will be compared with HST images of the core of NGC 1068 and with theoretical models for the size and appearance of the source in the thermal infrared. This work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

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