Identification of a complete sample of northern ROSAT All‐Sky Survey X‐ray sources | Zendy

Zickgraf F.J. | Zendy; Pakull M. W. | Zendy; Krautter J. | Zendy; Appenzeller I. | Zendy; Thiering I. | Zendy; Voges W. | Zendy; Mujica R. | Zendy; Serrano A. | Zendy; Chavarria C. | Zendy

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Identification of a complete sample of northern ROSAT All‐Sky Survey X‐ray sources

Author(s) -

Zickgraf F.J.,

Pakull M. W.,

Krautter J.,

Appenzeller I.,

Thiering I.,

Voges W.,

Mujica R.,

Serrano A.,

Chavarria C.

Publication year - 1998

Publication title -

astronomische nachrichten

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.394

H-Index - 63

eISSN - 1521-3994

pISSN - 0004-6337

DOI - 10.1002/asna.2123190121

Subject(s) - rosat , physics , astrophysics , galaxy

We report on the discovery of the rst z> 4 QSO in the ROSAT All Sky Survey (RASS) near the X-ray source RXJ1028.6 0844. From the Ly emission line found in an optical spectrum we measured z =4 :276 0:005. This is so far the hightest redshift for a QSO in the RASS. The RASS X-ray count rate of 0.035 ctss 1 leads to an X-ray flux of fx= 8.3310 13 ergs 1 cm 2 andaluminosityofLx 61046 ergs 1 in the 2 10keV rest frame energy band of the QSO if galactic column density of neutral hydrogen and a photon index = 2 isassumed.Thespectralenergydistributionasinferredfromthe observed hardness ratios indicates the presence of considerable intrinsic absorption in the QSO around 2 2:5keV.

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