Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..391p&link_type=abstract
(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews
Astronomy and Astrophysics
Astronomy
1
Astronomical Spectroscopy, Milky Way Galaxy, X Ray Sources, Autocorrelation, Black Holes (Astronomy), Exosat Satellite, Spectrum Analysis, Variability
Scientific paper
The authors present the results of four observations made by the EXOSAT Observatory of the X-ray transient 4U1630-47 during its 1984 outburst. They observed marked spectral changes as the source decayed from a maximum observed intensity of 8×10-9erg/cm2/sec (1.5 - 10 keV). The spectrum could be modelled by a soft "thermal-like" component with a high energy power-law tail. The relative contribution of the soft to hard component decreased as the total luminosity decreased. The authors compare these changes with those observed from the black hole candidate Cyg X-1 when it transits from a high to a low state. In addition they report the discovery of short timescale intensity variations (down to ≡50 msec) with a characteristic timescale of ≡20 sec. The authors present a precise position for this unidentified source.
Parmar Arvind N.
Stella Luigi
White Nicholas E.
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