Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984xue..conf..114s&link_type=abstract
In Max-Planck Inst. für Physik und Astrophysik X-Ray and UV Emission from Active Galactic Nuclei p 114-117 (SEE N85-17790 08-88)
Astronomy and Astrophysics
Astrophysics
2
Bl Lacertae Objects, Light Curve, Quasars, X Ray Spectra, Active Galaxies, Galactic Nuclei, Heao 1, Periodic Variations, Spatial Resolution
Scientific paper
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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