Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203l..53t&link_type=abstract
Astrophysical Journal, vol. 203, Jan. 15, 1976, pt. 2, p. L53-L55.
Astronomy and Astrophysics
Astronomy
30
Astronomical Photometry, Far Infrared Radiation, Galactic Radiation, Infrared Astronomy, Infrared Photometry, Radiant Flux Density, Seyfert Galaxies, Astronomical Spectroscopy, Infrared Spectra, Radiation Sources
Scientific paper
The detection of far-IR emission from the galaxy NGC 1068 in four passbands spanning the spectral range from 28 to 320 microns is reported. The observations were made with a 61-cm airborne IR telescope and a liquid-helium-cooled multifilter radiometer. It is found that the flux density between 38 and 100 microns increases with increasing wavelength to a maximum value of 454 (plus or minus 94) Jy, but decreases rapidly for wavelengths greater than 100 microns. The total flux is estimated to be about 3 by 10 to the -11th power W/sq m, which corresponds to a bolometric luminosity of 3.7 by 10 to 11th power times the solar luminosity at a distance of 20 Mpc. The nuclear M/L ratio is shown to be no greater than about 0.003, indicating that the scale, optical depth, or both, of a thermal far-IR source in NGC 1068 would have to be larger than those of the extended IR sources around the nuclei of our Galaxy, NGC 253, or M82.
Harper Doyal A.
Loewenstein Robert F.
Telesco Charles M.
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