SIMBAD references

1997A&A...323L..21Z - Astronomy and Astrophysics, volume 323L21-24 (1997/7-1)

Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources. V. Discovery of a z=4.28 QSO near the RASS source RX J1028.6-0844.

ZICKGRAF F.-J., VOGES W., KRAUTTER J., THIERING I., APPENZELLER I., MUJICA R. and SERRANO A.

Abstract (from CDS):

We report on the discovery of the first z>4 QSO in the ROSAT All Sky Survey (RASS) near the X-ray source RX J1028.6-0844. From the Lyα 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 0.035ct/s leads to an X-ray flux of fx=8.3310–13erg/s/cm and a luminosity of Lx≃6x1046erg/s in the 2-10keV rest frame energy band of the QSO if galactic column density of neutral hydrogen and a photon index {GAMMA}=-2 is assumed. The spectral energy distribution as inferred from the observed hardness ratios indicates the presence of considerable intrinsic absorption in the QSO around 2-2.5keV.

Abstract Copyright: ∼

Journal keyword(s): Surveys - X-rays: general - X-rays: galaxies - (Galaxies:) quasars: general - Galaxies: active - (Galaxies:) quasars: emission lines

Simbad objects: 3

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