Near-infrared images of the nuclear region of NGC 5128

Details Near-infrared images of the nuclear region of NGC 5128 Near-infrared images of the nuclear region of NGC 5128

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393..648t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 2, July 10, 1992, p. 648-657. Research supported by NASA, NSF, and

Astronomy and Astrophysics

Astronomy

23

Active Galactic Nuclei, Centaurus Constellation, Elliptical Galaxies, Infrared Imagery, Interstellar Extinction, Light Scattering, Color Photography, Near Infrared Radiation, Radio Galaxies, Radio Jets (Astronomy)

Scientific paper

High-resolution near-infrared images of NGC 5128 (Centaurus A) are presented, which probe the optically obscured nuclear region. The images show a central source at K (2.23 microns) and 3.26 microns. This central object is not prominent in the shorter wavelength images at J and H (1.23 and 1.65 micron, respectively), probably due to high extinction. The color images (H - K and J - H) provide evidence for a steep gradient in extinction across the array field. The images indicate three components: a red, variable, compact nucleus; the diffuse elliptical galaxy starlight; and a blue extension to the NE. The nucleus has decreased in flux density by a factor of 2.5 over less than about 5 yr at 3.26 microns. However, current spectral constraints on the nuclear source at near-infrared wavelengths cannot definitively determine the relative contributions from the known ratio synchrotron source (AGN) and from various possible dust-enshrouded thermal sources. The blue spot, approximately 7.6 +/- 0.1 arcsec NE of the nucleus appears to be a hole in the extinction, possibly enhanced by scattered light from the active galactic nucleus.

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