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A rocket observation of cosmic X-rays in the energy range between 0.15 and 20 keV

  • S. Hayakawa (a1), T. Kato (a1), F. Makino (a1), H. Ogawa (a1), Y. Tanaka (a1), K. Yamashita (a1), M. Matsuoka (a2), S. Miyamoto (a2), M. Oda (a2) and Y. Ogawara (a2)...

Abstract

Cosmic X-rays were observed with three sets of proportional counters covering the energy range between 0.15 and 20 keV. The detector born on a spinning rocket scanned a celestial region in which the galactic latitude b II changed from 30° to −55° across the galactic plane in the Cygnus-Cassiopeia region. The spectrum of Cyg XR-2 thus obtained is represented by a thermal bremsstrahlung of temperature 3.4 keV modified by the interstellar absorption for the hydrogen column density of 3 × 1021 cm−2. The diffuse component showed an interstellar absorption effect, which was however found much weaker than one would expect if the diffuse component were due entirely to be of extragalactic origin. The spectrum obtained in the highest latitude region is represented approximately by a power law E −1.8 but shows a possible trough at about 1 keV.

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References

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[1] Gorenstein, P., Gursky, H., and Garmire, G.: 1968, Astrophys. J. 153, 885.
[2] Giacconi, R.: this volume, p. 107.
[3] Bell, K. L. and Kingston, A. E.: 1967, Monthly Notices Roy. Astron. Soc. 136, 241.
[4] Bunner, A. N., Coleman, P. L., Kraushaar, W. L., McCammon, D., Palmieri, T. M., Shilepsky, A., and Ulmer, M.: 1969, Nature 223, 1222.
[5] Bowyer, C. S., Field, G. B., and Mack, J. E.: 1968, Nature 217, 32.

A rocket observation of cosmic X-rays in the energy range between 0.15 and 20 keV

  • S. Hayakawa (a1), T. Kato (a1), F. Makino (a1), H. Ogawa (a1), Y. Tanaka (a1), K. Yamashita (a1), M. Matsuoka (a2), S. Miyamoto (a2), M. Oda (a2) and Y. Ogawara (a2)...

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