One to eight month X-ray light curves for active extragalactic objects

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Bl Lacertae Objects, Light Curve, Quasars, X Ray Spectra, Active Galaxies, Galactic Nuclei, Heao 1, Periodic Variations, Spatial Resolution

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Scientific paper

Abstract

Light curves of 4 extragalactic objects obtained using the 0.5 to 20 keV LASS detectors on HEAO 1 are presented. Two of the objects are quasi-stellar sources; one is a BL Lacertae object; the fourth, although not unambiguously identified, is certainly extragalactic. In each case the light curves have a temporal resolution of a few days, and (because the sources are located at high ecliptic latitudes) extend at least 30 days in length. Variability is definitely detected in 3 of the 4 objects, suggesting that significant changes in flux may be common in active galaxies on monthly time scales.

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