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19962023
most citedCosmological Evolution of the Hard X-ray AGN Luminosity Function and the Origin of the Hard X-ray Background

1.1k citations · 16.2k across the 230 of their papers we have counts for

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astro-ph2001★ 21 cited

A candidate of a type-2 QSO at z=0.9: Large X-ray absorption with a strong broad-H-alpha emission line

Masayuki Akiyama, Kouji Ohta, Yoshihiro Ueda

Deep hard X-ray and near infrared observations of a type-2 radio-quiet QSO candidate at z=0.9, AXJ08494+4454, are reported. The 0.5-10keV Chandra X-ray Observatory spectrum of AXJ0…