| Автор | E C M Young |
| Автор | K N Yu |
| Дата выпуска | 1989-07-01 |
| dc.description | The 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 L<sub>y</sub> 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<sub>-26</sub><sup>+55</sup>%) 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. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | The contribution from extragalactic objects to the cosmic gamma-ray background |
| Тип | paper |
| DOI | 10.1088/0954-3899/15/7/013 |
| Electronic ISSN | 1361-6471 |
| Print ISSN | 0954-3899 |
| Журнал | Journal of Physics G: Nuclear and Particle Physics |
| Том | 15 |
| Первая страница | 1053 |
| Последняя страница | 1066 |
| Аффилиация | E C M Young; Dept. of Appl. Sci., City Polytech. of Hong Kong, Hong Kong |
| Аффилиация | K N Yu; Dept. of Appl. Sci., City Polytech. of Hong Kong, Hong Kong |
| Выпуск | 7 |
