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Hard X-ray imaging of the Galactic black hole candidate GX 339 - 4Imaging and spectral observations in the energy range 25-250 keV of the black hole candidate GX 339 - 4 have been obtained with the Energetic X-ray Imaging Telescope Experiment. Observations were made during a balloon flight from Alice Springs, Australia on UT 1989 May 8-10. A single source of nearly 6-sigma significance is detected near the center of the 3.4-deg field of view with a position consistent with GX 339 - 4. This is the first imaging observation of GX 339 - 4 at hard X-ray energies. This result confirms previously reported results from nonimaging experiments showing significant hard X-ray flux up to greater than about 60 keV, with a power-law spectral fit similar to the other black hole candidates such as Cygnus X - 1. The source may have been in an outburst state similar to that recently detected with BATSE on GRO.
Document ID
19920050421
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Covault, C. E.
(NASA Headquarters Washington, DC United States)
Grindlay, J. E.
(NASA Headquarters Washington, DC United States)
Manandhar, R. P.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 388
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
92A33045
Funding Number(s)
CONTRACT_GRANT: NAGW-624
Distribution Limits
Public
Copyright
Other

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