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Дата изменения: Wed Feb 18 14:45:27 2004
Дата индексирования: Mon Oct 1 22:35:49 2012
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Поисковые слова: ngc 253
SIGMA telescope





SIGMA is the coded-mask telescope capable to get images and spectra in the
30-1000 keV energy range with ~10' angluar resolutiuon and the field of view
(fully coded) of 4.3X4.7 degrees.
SIGMA assembly to GRANAT satellite is shown here


The main results from SIGMA include the VERY deep (more than 5 billion
seconds) imaging of the galactic center region, discovery of the
electron-positron annihilation lines from the Galactic "micro-quasar"
1E1740-294, and X-ray Nova Muscae, study of spectra and time variability of
the balck-hole candidates.




SIGMA view of the
galactic plane (220K)




511 keV line from the X-ray Nova Muscae:

  • spectrum

  • sky image in the 511
    kev line     (180K)




    SIGMA spectrum of the
    "Great Annihilator" 1E1740-294