M31: an extragalactic source of 1000 GeV gamma rays

The Dugway array of gamma-ray telescopes has been used to observe M31 at energies above 1000 GeV. An excess of gamma-ray counts was seen from the direction of M31 with a conservative maximum-likelihood significance of 1 percent and attributed to a random fluctuation. The estimated flux of about 2.2...

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Veröffentlicht in:	Astronomy and astrophysics (Berlin) 1984-07, Vol.136 (1), p.L14-L15
Hauptverfasser:	DOWTHWAITE, J. C, HARRISON, A. B, KIRKMAN, I. W, MACRAE, H. J, ORFORD, K. J, TURVER, K. E, WALMSLEY, M
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Earth, ocean, space Exact sciences and technology Gamma-ray sources gamma-ray bursts Stellar systems. Galactic and extragalactic objects and systems. The universe Unidentified sources and radiation outside the solar system
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	The Dugway array of gamma-ray telescopes has been used to observe M31 at energies above 1000 GeV. An excess of gamma-ray counts was seen from the direction of M31 with a conservative maximum-likelihood significance of 1 percent and attributed to a random fluctuation. The estimated flux of about 2.2 x 10 to the -10th photons/sq cm sec corresponds to a luminosity of 4 x 10 to the 40th erg/sec for energies above 1000 GeV. The measured spatial distribution is consistent with the angular dimension of the region of emission being about 1 degree.
ISSN:	0004-6361 1432-0746