E C M Young and K N Yu 1989 J. Phys. G: Nucl. Part. Phys. 15 1053 doi:10.1088/0954-3899/15/7/013
E C M Young and K N Yu
Show affiliationsThe authors have used the SAS-2 gamma -ray data and the Lick survey galaxy count data to determine the functional relationships between the absolute gamma -ray luminosities Ly and the absolute optical or X-ray luminosities of different classes of extragalactic objects such as quasars, Seyfert galaxies and X-ray clusters. From these, the authors are able to derive their contribution to the extragalactic gamma -ray background. They have shown that quasars (B<20) and Seyfert (type 1 and 1.5) galaxies together contribute to a substantial part (59-26+55%) of the diffuse gamma -ray background in the 35-100 MeV range, while X-ray clusters are negligible contributors. Therefore they conclude that the extragalactic gamma -ray background is likely to be generated by active galaxies such as quasars and Seyfert galaxies.
98.70.Vc Background radiations
98.70.Qy X-ray sources; X-ray bursts
Issue 7 (July 1989)
E C M Young and K N Yu 1989 J. Phys. G: Nucl. Part. Phys. 15 1053
Yue Chunxiao et al 2009 J. Phys.: Conf. Ser. 188 012006
John Hunt et al 2009 J. Radiol. Prot. 29 23
S Williams et al 2008 J. Phys.: Conf. Ser. 125 012038
M V Berry et al 2005 J. Opt. A: Pure Appl. Opt. 7 685
W. M. Holmes et al 2004 Europhys. Lett. 66 464
Weimin Kuang et al 2005 J. Opt. A: Pure Appl. Opt. 7 525
Mariano Bossi et al 2006 New J. Phys. 8 275
Francesco Nesi and Michele Modugno 2004 J. Phys. B: At. Mol. Opt. Phys. 37 S101
R G Andrzejak et al 2006 New J. Phys. 8 6