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Issue A&A
Volume 432, Number 3, March IV 2005
Page(s) 835 - 839
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20041804



A&A 432, 835-839 (2005)
DOI: 10.1051/0004-6361:20041804

The XMM-Newton spectrum of the high-z optically-obscured QSO RX J1343.4+0001: a classic radio quiet QSO

E. Piconcelli1, M. Guainazzi1, M. Cappi2, E. Jimenez-Bailon1 and N. Schartel1

1  XMM-Newton Science Operations Centre (ESAC), Apartado 50727, 28080 Madrid, Spain
    e-mail: epiconce@xmm.vilspa.esa.es
2  IASF/CNR, via Piero Gobetti 101, 40129 Bologna, Italy

(Received 25 August 2004 / Accepted 10 November 2004 )

Abstract
We present a 30 ks XMM-Newton observation of the z = 2.35 type II radio quiet quasar RX J1343.4+0001. These data provide the first good quality X-ray spectrum for this object. We measured a continuum slope $\Gamma = 1.85\pm0.10$ with only an upper limit on the column density of the absorbing material of $N_{\rm H}^{z}$ $\la$ 1022 cm-2 as well as an Fe K$\alpha$ emission line at the 3$\sigma$ confidence level. We do not find therefore a highly absorbed object nor a truly flat spectrum as suggested on the basis of previous less sensitive ROSAT and ASCA measurements. The $N_{\rm H}^{z}$ upper limit is fully consistent with the optical extinction 3<AV <10 inferred from IR observations. The Fe K$\alpha$ line is consistent with fluorescence from neutral iron and, noteworthy, is one of the most distant observed so far. The X-ray spectral properties of RX J1343.4+0001 agree well with the steep continuum slope ( $\Gamma \approx 1.9$) being independent of increasing redshift and luminosity as inferred by X-ray studies of large samples of RQ QSOs.


Key words: galaxies: individual: RX J1343.4+0001 -- galaxies: active -- galaxies: quasars: general -- X-ray: galaxies

SIMBAD Objects



© ESO 2005


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