A multi-wavelength survey of AGN in the XMM-LSS field. I. Quasar selection via the KX technique

Nakos, Theodoros; Willis, J. P.; Andreon, S.; Surdej, Jean; Riaud, Pierre; Hatziminaoglou, E.; Garcet, O.; Alloin, D.; Baes, M.; Galaz, G.; Pierre, M.; Quintana, H.; Page, M. J.; Tedds, J. A.; Ceballos, M. T.; Corral, A.; Ebrero, J.; Krumpe, M.; Mateos, S.

doi:10.1051/0004-6361:200809584

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A multi-wavelength survey of AGN in the XMM-LSS field. I. Quasar selection via the KX technique

Nakos, Theodoros; Willis, J. P.; Andreon, S. et al.

2009 • In Astronomy and Astrophysics, 494, p. 579-589

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https://hdl.handle.net/2268/15193

DOI
10.1051/0004-6361:200809584

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Keywords :

techniques: photometric; galaxies: aquasars: general; galaxies: active

Abstract :

[en] Aims. We present a sample of candidate quasars selected using the KX-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. Methods: The KX method identifies quasars on the basis of their optical (R and z') to near-infrared (K_s) photometry and point-like morphology. We combine these data with optical (u^*,g', r',i',z') and mid-infrared (3.6-24 mum) wavebands to reconstruct the spectral energy distributions (SEDs) of candidate quasars. Results: Of 93 sources selected as candidate quasars by the KX 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 <= z <= 2.5. The remaining 68/93 sources are classified as stars and unresolved galaxies.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Nakos, Theodoros; Sterrenkundig Observatorium, University of Ghent, Krijgslaan 281 S9, 9000 Ghent, Belgium ; Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août, 17, B5c, 4000 Sart Tilman, Belgium

Willis, J. P.; University of Victoria - UVic > Department of Physics and Astronomy

Andreon, S.; Osservatorio Astronomico di Brera, via Brera 28, 20121 Milano, Italy

Surdej, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Riaud, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Hatziminaoglou, E.; European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany

Garcet, O.; Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août, 17, B5c, 4000 Sart Tilman, Belgium

Alloin, D.; Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, Bât. 709, CEA Saclay, 91191 Gif sur Yvette Cedex, France

Baes, M.; Sterrenkundig Observatorium, University of Ghent, Krijgslaan 281 S9, 9000 Ghent, Belgium

Galaz, G.; Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile

More authors (9 more)

Language :

English

Title :

A multi-wavelength survey of AGN in the XMM-LSS field. I. Quasar selection via the KX technique

Publication date :

01 February 2009

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

494

Pages :

579-589

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://esoads.eso.org/abs/2009A%26A...494..579N
http://de.arxiv.org/abs/0812.3588

Commentary :

The authors thank EDP Sciences for their deposit authorization

Available on ORBi :

since 24 June 2009

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