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- W28912618 abstract "The SIGMA telescope on board the GRANAT satellite accumulated 82 hours of observation on the Seyfert galaxy NGC 4151 during 1990. The average photon spectrum obtained by combining all data is unusually steep (α≃3) and difficult to reconcile both with a previous detection of a few MeV γ-ray excess in 1977 and a single power law mean galaxy spectrum of α≃1.5 in the 2-300 keV band, unless strong spectral variability is present above 50-100 keV. Further, its extrapolation to tens of MeV energies in order to meet the SAS-2 and COS-B upper limits does not require a break or rollover at high energies. On the contrary, comparison of SIGMA data with the observed range of soft X-ray spectra, including a quasi contemporaneous one, indicates the need for a break at E≃50 keV" @default.
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- W28912618 date "1992-03-01" @default.
- W28912618 modified "2023-09-23" @default.
- W28912618 title "SIGMA observation of a steep spectral shape in NGC 4151 above 35 keV" @default.
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