Other
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..160s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, Feb. 1991, p. 160-176.
Other
31
Active Galactic Nuclei, Astronomical Photometry, Blazars, Infrared Photometry, Interstellar Extinction, Luminosity, Near Infrared Radiation, Red Shift, Synchrotron Radiation
Scientific paper
Thirty-one blazars were observed photometrically in the near-infrared, with additional observations in the optical for many of them. A few of them exhibit spectral behavior indicative of multiple emission components or emission processes. Six objects were also analyzed for any possible correlation between spectral steepness and luminosity. In one object, 0735 + 178, the spectral index alpha is correlated with the flux level with 99.9 pct confidence. Two other objects, 0846 + 513 and 0851 + 202, showed similar correlations at the 98 and 90 pct confidence levels, respectively. In all three cases the spectrum became flatter at higher flux levels. the data are consistent with expectations of models of inhomogeneous synchrotron models. In some cases, the self-Compton component may contribute significantly to the optical flux.
Sitko Annamaria K.
Sitko Michael L.
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