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The XMM deep survey in the CDF-S IX. An X-ray outflow in a luminous obscured quasar at z ˜ 1.6

Abstract: In active galactic nuclei (AGN)-galaxy co-evolution models, AGN winds and outflows are often invoked to explain why super-massive black holes and galaxies stop growing efficiently at a certain phase of their lives. They are commonly referred to as the leading actors of feedback processes. Evidence of ultra-fast (v ? 0.05c) outflows in the innermost regions of AGN has been collected in the past decade by sensitive X-ray observations for sizable samples of AGN, mostly at low redshift. Here we present ultra-deep XMM-Newton and Chandra spectral data of an obscured (NH˜ 2 × 1023 cm-2), intrinsically luminous (L2-10 keV˜ 4 × 1044 erg s-1) quasar (named PID352) at z ˜ 1.6 (derived from the X-ray spectral analysis) in the Chandra Deep Field-South. The source is characterized by an iron emission and absorption line complex at observed energies of E ˜ 2-3 keV. While the emission line is interpreted as being due to neutral iron (consistent with the presence of cold absorption), the absorption feature is due to highly ionized iron transitions (FeXXV, FeXXVI) with an outflowing velocity of 0.14+0.02-0.06c, as derived from photoionization models. The mass outflow rate – ~2 M? yr-1 – is similar to the source accretion rate, and the derived mechanical energy rate is ~9.5 × 1044 erg s-1, corresponding to 9% of the source bolometric luminosity. PID352 represents one of the few cases where indications of X-ray outflowing gas have been observed at high redshift thus far. This wind is powerful enough to provide feedback on the host galaxy.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Astronomy & Astrophysics, 2015, 583, A141

Editorial: EDP Sciences

 Fecha de publicación: 01/11/2015

Nº de páginas: 11

Tipo de publicación: Artículo de Revista

 DOI: 10.1051/0004-6361/201525852

ISSN: 0004-6361,1432-0746

 Proyecto español: AYA2012-31447 ; AYA2013-47447-C3-2-P

Url de la publicación: http://dx.doi.org/10.1051/0004-6361/201525852

Autoría

VIGNALI, CRISTIAN

IWASAWA, KAZUSHI

COMASTRI, ANDREA

GILLI, ROBERTO

LANZUISI, G.

RANALLI, PIERO

CAPPELLUTI, NICO

MAINIERI, VINCENZO

GEORGANTOPOULOS, IOANNIS

FRITZ, JACOPO

BRUSA, MARCELLA

BRANDT, WILLIAM NIELSEN

BAUER, FRANZ E.

FIORE, FABRIZIO

TOMBESI, F.