A measurement of fluctuations in the X-ray background by UHURU

Astronomy and Astrophysics – Astronomy

Scientific paper

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Background Radiation, Radiation Measurement, Uhuru Satellite, X Ray Astronomy, Collimators, Energy Spectra, Error Analysis, Galactic Radiation, Magellanic Clouds, Photon Density, Sky Radiation

Scientific paper

Data from Uhuru are used to search for fluctuations in the 2-7 keV X-ray background. Fluctuations, intrinsic to the sky, are observed to be 3.0 percent of the mean X-ray background, over an effective solid angle of 0.004 sr. These fluctuations are less than the minimum predicted from the ln N versus ln S curve previously estimated from Uhuru, and force renormalization of that curve by a factor of order 1/2. About one-third of the Uhuru sources with galactic latitude higher than 20 deg are identified with extra-galactic objects. The predicted level of fluctuations is based on assuming that all the unidentified high-galactic-latitude sources form a homogeneous volume distribution of extragalactic sources. The discrepancy between measured and predicted fluctuations does not easily disappear if all the unidentified sources are galactic. Therefore, it is concluded that a portion of the unidentified sources represents a class of objects at cosmological distances.

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