Low energy γ-ray observation of NGC4151

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 × 10 43 erg s −1 if a distance of 20 Mp...

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Published in:Nature (London) 1977-01, Vol.270 (5635), p.319-320
Main Authors: DI COCCO, G., BOELLA, G., PEROTTI, F., STIGLITZ, R., VILLA, G., BAKER, R. E., BUTLER, R. C., DEAN, A. J., MARTIN, S. J., RAMSDEN, D.
Format: Article
Language:English
Subjects:
Humanities and Social Sciences
letter
multidisciplinary
Science
Science (multidisciplinary)
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Summary: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 × 10 43 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 observations 4 by Ariel V indicate that the X-ray emission may originate from a compact object with dimensions less than 8 × 10 15 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.
ISSN:0028-0836
1476-4687
DOI:10.1038/270319a0