The near-infrared continua of BL Lacertae objects

Details The near-infrared continua of BL Lacertae objects The near-infrared continua of BL Lacertae objects

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..969a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 199, June 1982, p. 969-978.

Astronomy and Astrophysics

Astronomy

76

Astronomical Photometry, Bl Lacertae Objects, Continuous Spectra, Infrared Astronomy, Near Infrared Radiation, Colorimetry, Cosmic Dust, Power Spectra, Quasars

Scientific paper

Fifty-three BL Lac objects were photometrically observed at J, H, and K. A power-law continuum provides an excellent fit to the data, and the colors are distinct from those of quasars, and there is no indication of the additional infrared continuum seen in quasars. It is argued that both dust and gas are scarce in BL Lac nuclei, and that the lack of optical emission lines is due to an absence of ionized nuclear gas. BL Lac objects could underlie quasars, which exhibit line and thermal continuum emission at ultraviolet, optical and near-infrared wavelengths due to the presence of circumnuclear gas and dust. BL Lac objects whose colors overlap those of the empty-radio-field infrared sources are probably the redder extreme of a range of spectral indices.

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