Other
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..724s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, Oct. 1983, p. 724-731. NSF-supported research.
Other
34
Astronomical Photometry, Quasars, Astronomical Catalogs, Bl Lacertae Objects, Infrared Photometry, Infrared Spectroscopy, Nonthermal Radiation, Spectral Energy Distribution, Visual Photometry
Scientific paper
Visual and infrared photometry of strongly polarized QSOs (BL Lacertae objects) is reported. Spectral flux distributions of these objects are discussed in combination with results from earlier studies. With the exception of the well-resolved galaxies Mkn 421 and Mkn 501 only one object (1218 + 304) has a change in spectral index easily explained by the presence of an underlying galaxy. Six other sources appear to have either a break in their spectra near about 1 micron or a smoother general steepening of their spectra at shorter wavelengths. A spectral break at this wavelength may be attributed to a low flux of nonthermal radiation superimposed on a stellar energy distribution or by nonthermal electron energy losses.
Sitko Michael L.
Stein Wayne A.
Wisniewski Weislaw Z.
Zhang Ya-Xing
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