... OF 2-5 AND 5-10 keV SKY MAPS USING XMM-NEWTON ARCHIVAL OBSERVATIONS AND THEIR APPLICATION TO STUDY OF EXTRAGALACTIC X-RAY BACKGROUND Savchenko D.O., Iakubovskyi D.A. Bogolyubov Institute for Theoretical Physics of the NAS of Ukraine Sky maps are powerful ...
... juicy, realistic description of the star sky can teach many authors of popular ... quasars selected from the recent 7th Data Release of the Sloan Digital Sky Survey ... radioactively pure LiF crystal (553 g) deep underground in the Gran Sasso National ...