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Relativistic outflow in CXO CDFS J033260.0-274748

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arxiv astro-ph/0508225 v1 pith:RAL2NKCC submitted 2005-08-10 astro-ph

J. X. Wang , T. G. Wang , P. Tozzi , R. Giacconi , G. Hasinger , L. Kewley , V. Mainieri , M. Nonino
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C. Norman A. Streblyanska G. Szokoly T. Yaqoob A. Zirm
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keywords absorptionbroadextremelyrelativisticblueshiftedcdfsedgefeature
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In this letter we report the detection of a strong and extremely blueshifted X-ray absorption feature in the 1 Ms Chandra spectrum of CXO CDFS J033260.0-274748, a quasar at z = 2.579 with L_2-10keV ~ 4x10^44 ergs/s. The broad absorption feature at ~ 6.3 keV in the observed frame can be fitted either as an absorption edge at 20.9 keV or as a broad absorption line at 22.2 keV rest frame. The absorber has to be extremely ionized with an ionization parameter \xi ~ 10^4, and a high column density N_H >5x10^23 cm^-2. We reject the possibility of a statistical or instrumental artifact. The most likely interpretation is an extremely blueshifted broad absorption line or absorption edge, due to H or He--like iron in a relativistic jet-like outflow with bulk velocity of ~ 0.7-0.8 c. Similar relativistic outflows have been reported in the X-ray spectra of several other AGNs in the past few years.

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