JHK observations of quasars and BL Lac objects

Details JHK observations of quasars and BL Lac objects JHK observations of quasars and BL Lac objects

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..795g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 194, Mar. 1981, p. 795-804.

Astronomy and Astrophysics

Astronomy

45

Bl Lacertae Objects, Infrared Astronomy, Infrared Spectrophotometers, Near Infrared Radiation, Quasars, Continuums, Hubble Diagram, Infrared Photometry, Line Spectra, Red Shift, Stellar Luminosity, Variable Stars

Scientific paper

Infrared photometry of 40 QSOs and seven BL Lac objects is presented. In some cases the observations extend over several years. Twelve additional QSOs were not detected at a 3 Sigma upper limit of K = 14.5. The colors of non-variable QSOs as a function of redshift can be understood in terms of the presence or absence of spectral lines and continua in the various bandpasses. It is shown that the violently variable QSOs have colors indicative of a power law flux distribution, that they are mostly of high luminosity and that they make a major contribution to the scatter present in the infrared Hubble diagram.

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