Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966sci...154.1000m&link_type=abstract
Science, Volume 154, Issue 3752, pp. 1000-1002
Astronomy and Astrophysics
Astronomy
14
Scientific paper
The emission of 20 to 60 kev x-rays by an astronomical object in the constellation of Cygnus has been observed with a balloon-borne x-ray telescope flown from Hyderabad, India. The balloon data, used in conjunction with data pertaining to the flux in the wavelength range from 2 to 10 A can be fitted by a power law in photon energy varying as (hν)-1.7. The Cygnus object is the brightest object in the sky in the hard x-ray wavelength range and has the hardest spectrum of all observed objects that emit x-rays. The astronomical object should be capable of accelerating protons up to energies of the order of 1018 electron volts. Upper limits to the hard x-ray fluxes from Sco XR-1, Cyg XR-2, Oph XR-1, and Ser XR-1 are established; it is shown that the Sco XR-1 spectrum is very soft.
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