English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/6765
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

INTEGRAL observations of the cosmic X-ray background in the 5-100 keV range via occultation by the Earth

AutorChurazov, E.; Sunyaev, R.; Revnivtsev, M.; Sazonov, S.; Molkov, S.; Grebenev, S.; Winkler, C.; Parmar, A.; Bazzano, A.; Falanga, M.; Gros, A.; Lebrun, F.; Natalucci, L.; Ubertini, P.; Roques, J. P.; Bouchet, L.; Jourdain, E.; Knödlseder, J.; Diehl, R.; Budtz-Jorgensen, C.; Brandt, S.; Lund, N.; Westergaard, N. J.; Neronov, A.; Türler, M.; Chernyakova, M.; Walter, Malcolm R.; Produit, N.; Mowlavi, N.; Mas-Hesse, J. Miguel ; Domingo-Garau, Albert ; Gehrels, N.; Kuulkers, E.; Kretschmar, P.; Schmidt, M.
Palabras claveX-rays: diffuse background
X-rays: general
Galaxies: active
Fecha de publicación2007
EditorEDP Sciences
CitaciónA&A 467, 529-540 (2007)
Resumen[Aims] We study the spectrum of the cosmic X-ray background (CXB) in energy range ~ 5-100 keV.
[Methods] Early in 2006 the INTEGRAL observatory performed a series of four 30 ks observations with the Earth disk crossing the field of view of the instruments. The modulation of the aperture flux due to occultation of extragalactic objects by the Earth disk was used to obtain the spectrum of the Cosmic X-ray Background (CXB). Various sources of contamination were evaluated, including compact sources, Galactic Ridge emission, CXB reflection by the Earth atmosphere, cosmic ray induced emission by the Earth atmosphere and the Earth auroral emission.
[Results] The spectrum of the cosmic X-ray background in the energy band 5-100 keV is obtained. The shape of the spectrum is consistent with that obtained previously by the HEAO-1 observatory, while the normalization is ~10% higher. This difference in normalization can (at least partly) be traced to the different assumptions on the absolute flux from the Crab Nebulae. The increase relative to the earlier adopted value of the absolute flux of the CXB near the energy of maximum luminosity (20-50 keV) has direct implications for the energy release of supermassive black holes in the Universe and their growth at the epoch of the CXB origin.
Descripción12 pages, 12 figures.-- arXiv:0608250 astro-ph pre-print supplied.-- Final full-text version of the paper available at:
Versión del editorhttp://dx.doi.org/10.1051/0004-6361:20066230
Aparece en las colecciones: (CAB) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
0608250v2.pdf539,46 kBAdobe PDFVista previa
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.