Other
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219p...5g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, March 1, 1986, p. 5P-11P.
Other
12
Astronomical Photometry, Seyfert Galaxies, Galactic Nuclei, Infrared Photometry, Spectral Energy Distribution, Ultraviolet Spectra, X Ray Spectra
Scientific paper
JHKL observations of F9 made between 1976 and 1985 are presented. Until about 1980 the infrared output increased slowly, but during the following five years it dropped by about 1.3 mag at K(2.2 microns). The simultaneous decline at UV wavelengths was much severe. In recent months a recovery has been noted in J, H, and K but not L. The overall spectral distribution of F9 from infrared to UV has changed considerably during this period, resembling at various times the spectra of several other Seyfert 1 galaxies. The nuclear flux excess (over the expected contribution from the underlying normal galaxy) of F9 shows two components; a highly variable UV-optical continuum and a less variable infrared one. The latter may have its origin in dust heated by the former.
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