Concepedia

Publication | Closed Access

The Soft X-Ray Spectra of Three Cosmic Sources and Simultaneous Optical Observations of SCO XR-1

DOI

20

Citations

0

References

1970

Year

R. J. Grader, R. W. Hill, F. D. Seward, W. A. Hiltner
The Astrophysical Journal

Abstract

New X-ray spectra have been obtained for Sco XR-1, the Crab Nebula, and a low -energy source currently designated Vela XR-2. The range of photon energies covered was 150 eV-10 keV. The Sco XR-1 data are interpreted as thin-source, thermal bremsstrahlung with absorption in cool material, The new data are compared with previous low-energy spectra of Sco XR-1, and this source is shown to be probably variable in the soft X-ray region. The spectrum of the Crab Nebula shows absorption in cool material at low energies. Vela XR-2 is the most intense source of the three at photon energies <0.5 keV.