Far-infrared variability in active galactic nuclei

Details Far-infrared variability in active galactic nuclei Far-infrared variability in active galactic nuclei

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..516e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 15, 1987, p. 516-535.

Astronomy and Astrophysics

Astronomy

65

Active Galactic Nuclei, Astronomical Photometry, Far Infrared Radiation, Galactic Radiation, Infrared Astronomy Satellite, Blazars, Light Curve, Seyfert Galaxies, Variability

Scientific paper

Pointed IRAS observations of 20 active galaxies were examined in the first detailed search for far-infrared variability in a large sample of active galaxies. Less extensive survey data were also checked for evidence of strong 6-month variability in 45 active galaxies. The far-infrared fluxes of three highly polarized objects ('blazars') appeared to vary by up to a factor of 2 on time scales of a few months. No convincing cases of variability greater than about 15 percent (rms) were found in any of the normal quasars or Seyfert galaxies studied. It appears that blazars tend to be variable at all wavelengths, but most active galaxies may be systematically less variable in the far-infrared than at higher frequencies.

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