Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...259...38s&link_type=abstract
Astrophysical Journal, Part 1, vol. 259, Aug. 1, 1982, p. 38-47.
Astronomy and Astrophysics
Astronomy
13
Bl Lacertae Objects, Heao 1, Light Curve, Synchrotron Radiation, X Ray Sources, Astronomical Models, Galactic Nuclei, Radio Astronomy, Relativistic Particles, Sky Surveys (Astronomy)
Scientific paper
The Large Area Sky Survey (LASS) experiment on HEAO 1 that monitored the N galaxy/BL Lacertae object 3C 371 from August 19 to November 7, 1977 is discussed, noting that statistically significant threefold or larger intensity variations were observed in the flux range 0.5-20 keV. It is found that the degree of variability depends on the time of observation, with the source sometimes appearing constant and sometimes changing on time scales of 1 to 2 weeks. Also observed was an X-ray flare that lasted approximately 25 days. The total 80-day X-ray light curve is seen as suggesting either a superposition of X-ray flares or a variable injection rate that changes on weekly time scales. The observed X-ray flux is found to be consistent with that expected by extrapolating the nonthermal optical spectrum, suggesting that the optical to X-ray flux could be synchrotron radiation, provided that it is possible to account for the patterns of variability seen at optical and X-ray wavelengths and to dispose of inverse Compton difficulties.
Byram Edward T.
Chubb Talbot. A.
Friedman Harvey
Meekins John F.
Smathers Herbert W.
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