CCD photometry of Seyfert galaxy NGC 1068

Astronomy and Astrophysics – Astronomy

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Astronomical Photometry, Brightness Distribution, Charge Coupled Devices, Galactic Nuclei, Galactic Structure, Seyfert Galaxies, Absorption Spectra, Cosmic Dust, Galactic Bulge, Infrared Spectra, Radio Spectra, Stellar Evolution, Ubv Spectra

Scientific paper

CCD observations of NGC 1068 at the F. L. Whipple Observatory 0.61-m and MMT telescopes at B, V, and R wavelengths are analyzed for color and brightness features of the Seyfert galaxy nucleus and spiral arms. A comparison of published aperture photometry with the new CCD data shows agreement to within the errors of the published data. The differential brightness and color profiles of the galaxy show the presence of very young star forming regions dominating the spiral structure out to r = 18 arcsec (900 pc with H0 = 100 km/s per Mpc), surrounded by a region of abnormally strong dust absorption of between 18 and 36 arcsec. These two features cause the previously noted discontinuity between 'inner' and 'outer' spiral structure. From a fit to the nuclear bulge and disk of the galaxy, it is found that 9 percent of the luminosity within a 10-arcsec radius arises from the R = 12.74 mag semistellar nucleus. An arc of bright optical knots may be related to the proposed radio jet and may link Seyfert activity in the nucleus to star-formation activity in the disk.

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