X-ray observations of GX17+2 and GX9+9 by Aryabhata

Details X-ray observations of GX17+2 and GX9+9 by Aryabhata X-ray observations of GX17+2 and GX9+9 by Aryabhata

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.260..226k&link_type=abstract

Nature, vol. 260, Mar. 18, 1976, p. 226, 227. Research supported by the Department of Space of India.

Astronomy and Astrophysics

Astronomy

1

Satellite Observation, Spaceborne Astronomy, Spectral Energy Distribution, X Ray Sources, Bremsstrahlung, High Temperature Plasmas, Plasma Radiation, Proportional Counters, X Ray Telescopes

Scientific paper

The results of X-ray observations of GX17+2 and GX9+9 using the proportional counter telescope on the Indian satellite Aryabhata are reported. The spectrum of GX17+2 can be fitted to an exponential function, yielding a characteristic kT value of 9.31 plus or minus 0.03 keV. If the X radiation arises from bremsstrahlung in a hot plasma, the equivalent temperature of the emitting body at the time of observation was about 108 million K. The spectral distribution of GX9+9 is apparently governed by a power law with an exponent of about 1.2, and suggests a non-thermal mechanism for X-ray emission. Comparison of the present energy flux data with rocket observations indicates that emission from GX9+9 is variable.

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