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PKS 0208-512 detected at MeV energies by COMPTEL: a new "MeV-blazar" candidateстатья
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
- Авторы: Blom J.J., Bennett K., Bloemen H., Collmar W., Diehl R., Hermsen W., Iyudin A.F., Schoenfelder V., Stacy J.G., Steinle H., Williams O.R., Winkler C.
- Журнал: Astronomy and Astrophysics
- Том: 298
- Год издания: 1995
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 33
- Последняя страница: 37
- Аннотация: We report evidence for intense MeV emission of the blazar-type AGN PKS 0208-512 from two COMPTEL observations in May-June 1993. No significant indication was seen during a series of earlier observations performed in the second half of 1991. EGRET detected high-energy γ-rays during both periods, with similar average fluxes in both (and a short flare in September 1991). We argue that the MeV emission from PKS 0208-512 seems to represent a distinct spectral component, characterized by either a bumped shape or strong time variability, or possibly both. This might be a valuable clue in our understanding of "MeV Blazars" (i.e. blazars that are exceptionally bright at MeV energies), suggesting a possibly transient nature of the MeV-blazar phenomenon. As a consequence, essentially all γ-rays blazars might contribute to the MeV bump in the diffuse cosmic background radiation during certain epochs rather than any specific sub-class. --------------------------------------------------------------------------------
- Добавил в систему: Июдин Анатолий Федорович