Submillimeter photometry of extragalactic objects

Details Submillimeter photometry of extragalactic objects Submillimeter photometry of extragalactic objects

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216..698h&link_type=abstract

Astrophysical Journal, Part 1, vol. 216, Sept. 15, 1977, p. 698-705. Research supported by the Fannie and John Hertz Foundation

Other

96

Astronomical Photometry, Extragalactic Radio Sources, Galactic Radiation, Infrared Spectra, Submillimeter Waves, Thermal Emission, Absorption Spectra, Compton Effect, Cosmic Dust, Galaxies, Interferometers, Ionized Gases, Quasars, Radiant Flux Density, Seyfert Galaxies, Synchrotron Radiation, Thermal Radiation

Scientific paper

Submillimeter flux densities from five extragalactic objects have been measured, and upper limits set for three others. The galaxies NGC 253 and NGC 1068 have submillimeter spectra steeper than the cube of frequency. Of several source mechanisms considered for the far-infrared and submillimeter flux from NGC 1068, only thermal emission from dust at about 30 K is consistent with the data. The source of that flux, if thermal, must have a diameter of at least 5 arcsec. If one assumes radiation from dust, the masses of interstellar material derived for the central 80-arcsec diameter regions of NGC 253, NGC 1068, and NGC 5236 are, respectively, 800 million, 10 billion, and 3 billion solar masses. Measurements of submillimeter flux densities for 3C 273, BL Lac, NGC 1275, and NGC 5128 show no excess above values obtained by interpolation between radio and mid-infrared data.

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