High resolution optical and UV observations of the centers of NGC 1316 and NGC 3998 with the Hubble Space Telescope

Details High resolution optical and UV observations of the centers of NGC 1316 and NGC 3998 with the Hubble Space Telescope High resolution optical and UV observations of the centers of NGC 1316 and NGC 3998 with the Hubble Space Telescope

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434...67f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 434, no. 1, p. 67-81

Astronomy and Astrophysics

Astronomy

30

Active Galactic Nuclei, Astronomical Models, Brightness Distribution, Radio Galaxies, Ultraviolet Astronomy, Ultraviolet Emission, Visible Spectrum, Astronomical Photometry, Faint Object Camera, High Resolution, Hubble Space Telescope, Interstellar Extinction, Interstellar Matter

Scientific paper

B and UV high-resolution images obtained with Hubble Space Telescope (HST) Faint Object Camera reveal centrally increasing surface brightness and UV-bright point sources at the nuclei of the early-type galaxies NGC 1316 and NGC 3998. Model fitting of the surface brightness distribution dose not exclude a central flattening, which could however be the result of extinction and/or of improper evaluation of the point-source component. The present data, while not requiring the presence of central massive black holes in these two galaxies, make them possible candidates. Follow-up work is needed to study this point further. The presence of unresolved nuclei gives model-dependent support to this quest, if these sources are due to small Active Galactic Nuclei (AGN). These UV-bright sources could belong to the low-luminosity end of active galactic nuclear emission.

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