2009A&A...493..445D


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.04CET20:29:38

2009A&A...493..445D - Astronomy and Astrophysics, volume 493, 445-451 (2009/1-2)

An extreme EXO: a type 2 QSO at z=1.87.

DEL MORO A., WATSON M.G., MATEOS S., AKIYAMA M., HASHIMOTO Y., TAMURA N., OHTA K., CARRERA F.J. and STEWART G.

Abstract (from CDS):

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. 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. 2XMM J123204+215255 is a bright X-ray source with fX≃10–12erg/cm2/s (2-10keV 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≃5300km/s) emission line, which is almost certainly Hα at z=1.87. The X-ray spectrum shows evidence of significant absorption (NH>1023cm–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).

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: quasars: general - X-rays: galaxies - infrared: galaxies

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9708 1
2 2XMMp J123204.9+215255 QSO 12 32 04.9 +21 52 55           ~ 6 1
3 HD 119496 * 13 43 03.7342941213 +29 40 43.482966217   9.15 9.06     A2V 20 0

    Equat.    Gal    SGal    Ecl

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