ISSN:
1476-4687
Quelle:
Nature Archives 1869 - 2009
Thema:
Biologie
,
Chemie und Pharmazie
,
Medizin
,
Allgemeine Naturwissenschaft
,
Physik
Notizen:
[Auszug] A high-resolution image from the Rosat X-ray satellite reveals many faint discrete sources in the 0.1–2-keV energy range. Optical spectroscopy of these sources performed at the Anglo-Australian Telescope shows that many of them are quasars, and the inferred density of quasars on the sky ...
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1038/353315a0
Permalink