Nature of Hard X-ray Source from Optical Identification of the ASCA Large Sky Survey

Details Nature of Hard X-ray Source from Optical Identification of the ASCA Large Sky Survey Nature of Hard X-ray Source from Optical Identification of the ASCA Large Sky Survey

1998-11-02

arxiv.org/abs/astro-ph/9811012v1

Astronomy and Astrophysics

Astrophysics

6 pages, 6 figures. Proceeding of the first XMM workshop "Science with XMM" (30 Sep. - 2 Oct. 1998 ESTEC)

Scientific paper

We present results of optical identification of the ASCA Large Sky Survey. X-ray sources which have hard X-ray spectra were identified with type-2 AGN at redshifts smaller than 0.5. It is supported that the absorbed X-ray spectrum of type-2 AGN makes the Cosmic X-ray Background harder in the hard X-ray band than type-1 AGN, which is main contributer in the soft X-ray band. Absence of type-2 AGN at redshift larger than 1 in the identified sample, which contrasts to the existence of 6 broad-line QSOs, suggests a deficiency of so-called ``type-2 QSO'' at high redshift.

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