ISSN:
1476-4687
Quelle:
Nature Archives 1869 - 2009
Thema:
Biologie
,
Chemie und Pharmazie
,
Medizin
,
Allgemeine Naturwissenschaft
,
Physik
Notizen:
[Auszug] The cosmic X-ray background (XRB) is usually discussed in two energy bands. In the soft band below 2 keV an excess is observed in the spectrum3 5 and much of the emission is resolved into quasars4'5. Above 3 keV, where most of the energy density resides, the spectrum is hard, the sky is ...
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1038/364693a0
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