The question of extinction in active galactic nuclei - Infrared spectral observations of NGC 1614, NGC 7469 and NGC 1275

Details The question of extinction in active galactic nuclei - Infrared spectral observations of NGC 1614, NGC 7469 and NGC 1275 The question of extinction in active galactic nuclei - Infrared spectral observations of NGC 1614, NGC 7469 and NGC 1275

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196p.101a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 196, Sept. 1981, p. 101P-107P.

Astronomy and Astrophysics

Astronomy

66

Active Galactic Nuclei, Infrared Astronomy, Interstellar Extinction, Seyfert Galaxies, Active Galaxies, Emission Spectra, Infrared Spectra, Line Spectra, Neon, Red Shift

Scientific paper

Spectra of nuclei in the active galaxies NGC 1614, 7469 and 1275 are presented. The Ne II fine structure line and the 11.25 micron feature are observed in a NGC 7469 Seyfert nucleus and the high luminosity emission-line nucleus of NGC 1614. Observations are found to be consistent with no large optical extinction, although the 11.25 and 8.65 micron emission features make doubtful quantitative estimates of extinction based on the 10 micron minimum. Silicate absorption interpretation of the 10 micron minimum for M82 and NGC 1614 requires massive visual extinction, while the spectrum of NGC 7469 indicates no large internal extinction. Such features in the type 1 Seyfert NGC 7469 and 1614 indicate a dust-emission mechanism, while the featureless spectrum of NGC 1275 may arise from mechanisms such as synchrotron radiation, greybody thermal emission or self-absorbed silicate emission.

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