ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] The quasar PKS0558 - 504 (z = 0.137, V = 15.0) was identified optically on the basis of X-ray positions from the HEAO-1 survey2. The X-ray spectrum is remarkably steep, with an energy index ax=1.31 (Sxoc E~a*, where 5X is the radiation flux per energy interval, and E is the photon energy) of ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/350589a0
Permalink