Abstract
To reveal the origin of the cosmic X-ray background (CXB) in the hard band, we are now conducting a wide (∼ 7 deg2) and deep (∼ 1 × 10−13 erg sec−1 cm−2 in the 2-10 keV band) survey with the ASCA (the ASCA Large Sky Survey, hereafter LSS). We have detected 83 sources above 4 sigma level in the 0.7–10 keV band with the GIS and resolved ∼30% of the CXB in the 2–10 keV band into discrete sources (Ueda 1996). AGNs (type 1 and type 2) and clusters of galaxies are expected to be major contributers to these X-ray sources.
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