ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] At present we are not aware of any QSOs with steep radio spectra which have redshifts greater than 2.4; all those with higher redshifts have flat or concave radio spectra. (We use the spectral categories defined by Stannard1, except that the spectral index is determined at 1 GHz observed frequency ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/252209a0
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