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Título: | An extreme EXO: a type 2 QSO at z = 1.87 |
Autor: | Moro, A. del; Watson, Mike; Mateos, Silvia CSIC ORCID ; Akiyama, Masayuki; Hashimoto, Y.; Tamura, N.; Ohta, K.; Carrera, Francisco J. CSIC ORCID CVN ; Stewart, G. C. | Palabras clave: | Galaxies: quasars: general Infrared: galaxies X-ray galaxies Galaxies: active |
Fecha de publicación: | 2009 | Editor: | EDP Sciences | Citación: | Astronomy and Astrophysics 493(2): 445-451 (2009) | Resumen: | [Aims]: We aim to understand the multi-wavelength properties of 2XMM J123204+215255, the source with the most extreme X-ray-to-optical flux ratio amongst a sample of bright X-ray selected EXOs drawn from a cross-correlation of the 2XMMp catalogue with the SDSS-DR5 catalogue. [Methods]: We use 2XMMp X-ray data, SDSS-DR5, NOT and UKIRT optical/NIR photometric data and Subaru MOIRCS IR spectroscopy to study the properties of 2XMM J123204+215255. We created a model SED including an obscured QSO and the host galaxy component to constrain the optical/IR extinction and the relative contribution of the AGN and the galaxy to the total emission. [Results]: 2XMM J123204+215255 is a bright X-ray source with fx ≈ 10-12 erg cm-2 s-1 (2-10 keV energy band) which has no detection down to a magnitude i′ 25.2. NIR imaging reveals a faint K-band counterpart and NIR spectroscopy shows a single broad (FWHM =≃ 5300 km s-1) emission line, which is almost certainly Hα at z = 1.87. The X-ray spectrum shows evidence of significant absorption (NH > 1023 cm-2), typical of type 2 AGN, but the broad Hα emission suggests a type 1 AGN classification. The very red optical/NIR colours (i′ - K > 5.3) strongly suggest significant reddening however. We find that simple modelling can successfully reproduce the NIR continuum and strongly constrain the intrinsic nuclear optical/IR extinction to Av ≈ 4, which turns out to be much smaller than the expected from the X-ray absorption (assuming Galactic gas-to-dust ratio). © ESO 2009. | Versión del editor: | http://dx.doi.org/10.1051/0004-6361:200809665 | URI: | http://hdl.handle.net/10261/169646 | DOI: | 10.1051/0004-6361:200809665 | Identificadores: | doi: 10.1051/0004-6361:200809665 issn: 0004-6361 e-issn: 1432-0746 |
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EXOQSO.pdf | 573,48 kB | Adobe PDF | Visualizar/Abrir |
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