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• W4301462078 abstract "<i>Aims. <i/>We present a sample of candidate quasars selected using the <i>KX<i/>-technique. The data cover 0.68 deg<sup>2<sup/> of the X-ray Multi-Mirror (XMM) Large-Scale Structure (LSS) survey area where overlapping multi-wavelength imaging data permits an investigation of the physical nature of selected sources.<i>Methods. <i/>The <i>KX<i/> method identifies quasars on the basis of their optical (<i>R<i/> and <i>z'<i/>) to near-infrared photometry and point-like morphology. We combine these data with optical (<i>u<sup>*<sup/><i/>,<i>g'<i/>, <i>r'<i/>,<i>i'<i/>,<i>z'<i/>) and mid-infrared (3.6-24 <i>μ<i/>m) wavebands to reconstruct the spectral energy distributions (SEDs) of candidate quasars.<i>Results. <i/>Of 93 sources selected as candidate quasars by the <i>KX<i/> method, 25 are classified as quasars by the subsequent SED analysis. Spectroscopic observations are available for 12/25 of these sources and confirm the quasar hypothesis in each case. Even more, 90% of the SED-classified quasars show X-ray emission, a property not shared by any of the false candidates in the KX-selected sample. Applying a photometric redshift analysis to the sources without spectroscopy indicates that the 25 sources classified as quasars occupy the interval 0.7 <i>≤<i/> <i>z<i/> <i>≤<i/> 2.5. The remaining 68/93 sources are classified as stars and unresolved galaxies." @default.
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• W4301462078 date "2008-12-22" @default.
• W4301462078 modified "2023-10-18" @default.
• W4301462078 title "A multi-wavelength survey of AGN in the XMM-LSS field" @default.
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• W4301462078 doi "https://doi.org/10.1051/0004-6361:200809584" @default.
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