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New Hard X-ray Sources Observed With HEAO A2


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1977-09-01 to 1978-03-09


This data set contains on tape the results of a complete sky survey conducted by the Cosmic X-ray Experiment on the HEAO 1 satellite. This particular survey identified new weak <30 UFU) X-ray sources. Included are 47 new sources for which intensity is typically 1-2 UFU, seven sources only recently discovered, and improved positions for another six previously known sources. The data are in the form of a list of error boxes, size, source intensities, approximate times of observation, and suggested identification. The data set magnetic tape and contains two identical files of the source list, one written in ASCII and the other in EBCDIC. The logical record size is 124 bytes. Each logical record is an image of a line normally printed on a line printer. The physical block size is 2480 bytes. This source list, together with a brief description of the instrument and analytical method used in determining the error boxes, was published in the paper "New Hard X-ray Sources with HEAO A-2," F.E. Marshall et al., Astrophys. J. Suppl., v. 40, pp. 657-665, 1979.

Alternate Names

  • New Hard X-ray Sources


  • Astronomy: X-Ray


  • 77-075A-02D

Additional Information



Questions and comments about this data collection can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Elihu A. BoldtData ProviderNASA Goddard Space Flight

Selected References

  • Marshall, F. E., et al., New hard X-ray sources observed with HEAO A-2, Astrophys. J. Suppl. Ser., 40, No. 3, 657-666, doi:10.1086/190600, July 1979.
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