Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106...11f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 1, p. 11-27.
Astronomy and Astrophysics
Astronomy
41
Bl Lacertae Objects, Blazars, Elliptical Galaxies, Infrared Astronomy, Near Infrared Radiation, Visual Observation, Active Galactic Nuclei, Energy Sources, Thermal Emission
Scientific paper
We present simultaneous optical to NIR observations of 34 blazars, most of which classical BL Lacertae objects, with repeated observations for 21 of them. The observations cover a period of three years with a typical time interval of six months. With the sole exception of PKS 2208-137, all observed optical to NIR flux distributions can be described either by a single power law or by a power law plus the contribution of a standard elliptical galaxy. The optical and NIR emission are strongly correlated and usually maintain the spectral index even under substantial flux variations. The average spectral index of the nonthermal emission, in the range 8 x 10 exp 13 to 7 x 10 exp 14 Hz, is 1.08 +/- 0.06 with significantly flatter spectra for the X-ray-selected subsample.
Bersanelli Marco
Bouchet Patrice
Falomo Renato
Tanzi Enrico G.
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