New hard X-rays sources at 38 deg declination

Details New hard X-rays sources at 38 deg declination New hard X-rays sources at 38 deg declination

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..331u&link_type=abstract

(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie

Astronomy and Astrophysics

Astronomy

1

Astronomical Spectroscopy, Balloon-Borne Instruments, X Ray Sources, Collimators, Point Sources, Proportional Counters, Prototypes, Radiant Flux Density, Spectral Resolution

Scientific paper

Balloon-borne detection of three hard X ray sources in the 15-150keV range are reported. The balloon reached 3 mb height, and carried two multiwire spectroscopic proportional counters with 2700 sq cm sensitive areas each. The strip of sky between 4 h 30 m and 7 h 30 m, centered around the 38th declination, was scanned with an instrument sensitivity of one photon/100,00 sq cm. Three excess X ray fluxes were detected and fitted with the collimator response to a point source by means of an iterative Chi-sq method. The objects were HXR 0516 + 38, HXR 0638 + 38, and HXR 0707 + 38, which could not be correlated with any known object.

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