A shot-noise interpretation of the historical light curves of quasi-stellar objects

Details A shot-noise interpretation of the historical light curves of quasi-stellar objects A shot-noise interpretation of the historical light curves of quasi-stellar objects

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211..649f&link_type=abstract

Astrophysical Journal, Part 1, vol. 211, Feb. 1, 1977, p. 649-652. Research supported by the National Research Council of Canad

Astronomy and Astrophysics

Astrophysics

5

Light Curve, Quasars, Shot Noise, Astronomical Catalogs, Astronomical Models, Luminous Intensity

Scientific paper

If the optical variability of QSOs is due to a common shot-noise process, then the mean luminosity of any object should be proportional to its variance in luminosity. This hypothesis is tested with a sample of 20 QSOs for which historical light curves are available. It is evident that a single shot-noise model cannot account for all the data. However, 18 of the sample objects fall into one of two well-defined groups. In the context of the shot-noise model, this separation is simply interpreted as indicating two distinct shot amplitudes. The possibility that the two groups may be correlated with the optical image and with the radio spectral index is briefly discussed.

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