Spectral distinction between black holes and neutron stars: the contribution of the sigma telescope

Details Spectral distinction between black holes and neutron stars: the contribution of the sigma telescope Spectral distinction between black holes and neutron stars: the contribution of the sigma telescope

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..19...45l&link_type=abstract

Advances in Space Research, Volume 19, Issue 1, p. 45-54.

Computer Science

1

Scientific paper

After more than four years of operation, the imaging gamma- ray telescope SIGMA has accumulated several days of observation toward black holes and neutron stars. So far, more than twenty five of them have been detected with SIGMA. Although all these sources have spectra dominated by comptonisation, it is remarkable that suspected black hole systems are particularly numerous among the most luminous sources above 150 keV. Also, two black hole candidates have shown a strong transient emission around 511 keV, which has been interpreted as electron-positron annihilation features. We will discuss in this paper the reliability of these two phenomena, a strong luminosity above 150 keV and the emission of an annihilation line, as potential black hole criteria.

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