Abstract
OBSERVATIONS of the Seyfert galaxy NGC4151 by Ariel V, OSOI VII and UCSD (refs 1–3 respectively) have demonstrated that it has a relatively flat X-ray spectrum up to photon energies greater than 100 keV. The X-ray luminosity of this object is of the order of 4 × 1043 erg s−1 if a distance of 20 Mpc is assumed, and exceeds the integrated luminosity at all the other observed greater wavelengths. Long-term observations4 by Ariel V indicate that the X-ray emission may originate from a compact object with dimensions less than 8 × 1015 cm, presumably the nucleus of the Galaxy. Here we present the preliminary results of a positive measurement in the low energy γ-ray region of the spectrum, which are in good agreement with the X-ray data and confirm the intense high energy luminosity of the object.
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References
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DI COCCO, G., BOELLA, G., PEROTTI, F. et al. Low energy γ-ray observation of NGC4151. Nature 270, 319–320 (1977). https://doi.org/10.1038/270319a0
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DOI: https://doi.org/10.1038/270319a0
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