XMM-Newton observations of an absorbed z=0.67 QSO: no dusty torus?

Details XMM-Newton observations of an absorbed z=0.67 QSO: no dusty torus? XMM-Newton observations of an absorbed z=0.67 QSO: no dusty torus?

2003-02-19

arxiv.org/abs/astro-ph/0302375v1

Mon.Not.Roy.Astron.Soc.342:321,2003

Astronomy and Astrophysics

Astrophysics

To appear in MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06547.x

We present XMM-Newton observations of AXJ0341.4-4453, a mildly reddened A_V<7 QSO at a redshift of z=0.672. The XMM-Newton spectrum shows a large obscuring column N_H~10^23 cm^{-2} corresponding to A_V~70, in agreement with previous results based on the lower limit of the ASCA hardness ratio. The X-ray spectrum is represented by a 'scattering' model with Gamma~2.0 with the scattered power-law normalization being a few per cent of the hard component. No FeK line is detected with a 90 per cent upper limit on its equivalent width of ~360eV. The large discrepancy between the column density observed in X-rays and that inferred from the Balmer decrement can be explained by dust sublimation near the nucleus. Then, the X-ray and the optical obscuration come from two different regions: the X-ray close to the accretion disk while the optical at much larger >0.25pc scales.

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