The near-infrared variability of a sample of optically selected quasars

Details The near-infrared variability of a sample of optically selected quasars The near-infrared variability of a sample of optically selected quasars

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..957n&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, April 1989, p. 957-977. Research supported by NASA, NSF, and California Institut

Astronomy and Astrophysics

Astronomy

51

Astronomical Photometry, Infrared Sources (Astronomy), Near Infrared Radiation, Quasars, Luminosity, Sky Surveys (Astronomy), Statistical Analysis, Variability

Scientific paper

A complete sample of 108 optically selected quasars, the Palomar-Green quasars, has been studied at near-infrared wavelengths over an average time base of about 6 yr; in some cases the time base extends to 20 yr. The measurements show that about half the quasars have a high probability of having varied, but that half show little evidence of variability, in sharp contrast to published studies indicating that most quasars vary on comparable timescales at optical wavelengths. The maximum amplitude of variation is less than 1 mag and generally near 0.5 mag.

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