Homogeneous J, H, K, L photometry of a sample of BL Lac objects

Details Homogeneous J, H, K, L photometry of a sample of BL Lac objects Homogeneous J, H, K, L photometry of a sample of BL Lac objects

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104...28b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 1, July 1992, p. 28-39.

Astronomy and Astrophysics

Astronomy

40

Astronomical Photometry, Bl Lacertae Objects, Emission Spectra, Infrared Telescopes, Near Infrared Radiation, Active Galactic Nuclei, Astronomical Observatories, Data Reduction, Iue

Scientific paper

Homogeneous J, H, K, L, photometry of 42 BL Lacertae objects is presented. The observations cover a period of 3 yr with typical time interval of 6 months. It is shown that the near-IR nonthermal emission of all the objects but two is well described by a single power law (fnu varies as nu exp -alpha) after accounting for host galaxy contribution. In spite of large flux variability, changes of spectral index are small and rare. In the few cases where significant variations of alpha are observed, no evidence of correlation with the flux level is found. The present data confirm that the spectral index distribution is bimodal with the X-ray-selected objects being significantly flatter than radio-selected ones.

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