Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201l.121k&link_type=abstract
Astrophysical Journal, vol. 201, Nov. 1, 1975, pt. 2, p. L121-L124.
Astronomy and Astrophysics
Astronomy
36
Energy Spectra, Light Curve, Novae, Stellar Luminosity, X Ray Sources, Ariel Satellites, Crab Nebula, Decay, Frequency Distribution, Galactic Structure, Luminous Intensity, Spaceborne Astronomy, Transient Response, Uhuru Satellite, X Ray Astronomy
Scientific paper
The Ariel-5 satellite has monitored the X-ray light curve of A1524-62 almost continuously from 40 days prior to maximum light until its disappearance below the effective experimental sensitivity. The source exhibited maximum light on Dec. 4, 1974, at a level of 0.9 the apparent magnitude of the Crab Nebula in the energy band 3-6 keV. Although similar to previously reported transient sources with a decay time constant of about 2 months, the source exhibited an extended, variable preflare on-state of about 1 month at a level of greater than 0.1 maximum light. The four bright (greater than 0.2 of the Crab Nebula) transient sources observed during the first half-year of Ariel-5 operation are indicative of a galactic disk distribution, a luminosity at maximum in excess of 10 to the 37-th power ergs/sec, a frequency of occurrence which may be as high as 100/yr, and a median decay time which is less than 1 month.
Boldt Elihu A.
Eadie G.
Holt Stephen S.
Kaluzienski L. J.
Pounds Kenneth A.
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