Spectral shape of the UV ionizing background and He II absorption at redshifts 1.8 $<$ z $<$ 2.9

Publisher： Edp Sciences

E-ISSN： 1432-0746|461|3|893-909

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.461, Iss.3, 2007-01, pp. : 893-909

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