Volume 470, Number 2, August I 2007
|Page(s)||497 - 503|
|Published online||16 May 2007|
RBS1423 – a new QSO with relativistic reflection from an ionised disk*
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: firstname.lastname@example.org
Accepted: 2 April 2007
Aims.We present the analysis and results of a 20 ks XMM-Newton observation of RBS1423.
Methods.X-ray spectral analysis is used to establish a significantly broadened relativistic iron Kα line from a highly ionised disk.
Results.A QSO at was considered to be the optical counterpart of this ROSAT Bright Survey X-ray source. Based on the improved XMM-Newton source position we identified a QSO as optical counterpart to RBS1423. The 0.2–12 keV X-ray luminosity of this radio-quiet QSO is 6 1044 erg/s. The XMM-EPIC spectra are well described by a power law with a significantly broadened iron Kα line. Disk line models for both Schwarzschild and Kerr black holes require hydrogen-like iron ions to fit the measured line profile. Significant ionisation of the reflection disk is confirmed by model fits with ionised disk models, resulting in an ionisation parameter ξ ~ 2000.
Key words: galaxies: active / quasar: general / X-rays: individuals: RBS1423
© ESO, 2007
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