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A multi-wavelength survey of AGN in the XMM-LSS field, I : quasar selection via the KX technique

(2009) ASTRONOMY & ASTROPHYSICS. 494(2). p.579-589
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Abstract
Aims. We present a sample of candidate quasars selected using the KX-technique. The data cover 0.68 deg(2) 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 mu m) 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.
Keywords
PHOTOMETRIC REDSHIFTS, REDDENED QUASARS, SWIRE, NEWTON, RED QUASARS, DIGITAL SKY SURVEY, PHOTON IMAGING CAMERA, ACTIVE GALACTIC NUCLEI, INFRARED EXTRAGALACTIC SURVEY, SPECTRAL ENERGY-DISTRIBUTIONS, galaxies: active, galaxies: aquasars: general, techniques: photometric

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MLA
Nakos, Theodoros et al. “A Multi-wavelength Survey of AGN in the XMM-LSS Field, I : Quasar Selection via the KX Technique.” ASTRONOMY & ASTROPHYSICS 494.2 (2009): 579–589. Print.
APA
Nakos, T., Willis, J., Andreon, S., Surdej, J., Riaud, P., Hatziminaoglou, E., Garcet, O., et al. (2009). A multi-wavelength survey of AGN in the XMM-LSS field, I : quasar selection via the KX technique. ASTRONOMY & ASTROPHYSICS, 494(2), 579–589.
Chicago author-date
Nakos, Theodoros, JP Willis, S Andreon, J Surdej, P Riaud, E Hatziminaoglou, O Garcet, et al. 2009. “A Multi-wavelength Survey of AGN in the XMM-LSS Field, I : Quasar Selection via the KX Technique.” Astronomy & Astrophysics 494 (2): 579–589.
Chicago author-date (all authors)
Nakos, Theodoros, JP Willis, S Andreon, J Surdej, P Riaud, E Hatziminaoglou, O Garcet, D Alloin, Maarten Baes, G Galaz, M Pierre, H Quintana, MJ Page, JA Tedds, MT Ceballos, A Corral, J Ebrero, M Krumpe, and S Mateos. 2009. “A Multi-wavelength Survey of AGN in the XMM-LSS Field, I : Quasar Selection via the KX Technique.” Astronomy & Astrophysics 494 (2): 579–589.
Vancouver
1.
Nakos T, Willis J, Andreon S, Surdej J, Riaud P, Hatziminaoglou E, et al. A multi-wavelength survey of AGN in the XMM-LSS field, I : quasar selection via the KX technique. ASTRONOMY & ASTROPHYSICS. 2009;494(2):579–89.
IEEE
[1]
T. Nakos et al., “A multi-wavelength survey of AGN in the XMM-LSS field, I : quasar selection via the KX technique,” ASTRONOMY & ASTROPHYSICS, vol. 494, no. 2, pp. 579–589, 2009.
@article{950031,
  abstract     = {Aims. We present a sample of candidate quasars selected using the KX-technique. The data cover 0.68 deg(2) 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 mu m) 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.},
  author       = {Nakos, Theodoros and Willis, JP and Andreon, S and Surdej, J and Riaud, P and Hatziminaoglou, E and Garcet, O and Alloin, D and Baes, Maarten and Galaz, G and Pierre, M and Quintana, H and Page, MJ and Tedds, JA and Ceballos, MT and Corral, A and Ebrero, J and Krumpe, M and Mateos, S},
  issn         = {0004-6361},
  journal      = {ASTRONOMY & ASTROPHYSICS},
  keywords     = {PHOTOMETRIC REDSHIFTS,REDDENED QUASARS,SWIRE,NEWTON,RED QUASARS,DIGITAL SKY SURVEY,PHOTON IMAGING CAMERA,ACTIVE GALACTIC NUCLEI,INFRARED EXTRAGALACTIC SURVEY,SPECTRAL ENERGY-DISTRIBUTIONS,galaxies: active,galaxies: aquasars: general,techniques: photometric},
  language     = {eng},
  number       = {2},
  pages        = {579--589},
  title        = {A multi-wavelength survey of AGN in the XMM-LSS field, I : quasar selection via the KX technique},
  url          = {http://dx.doi.org/10.1051/0004-6361:200809584},
  volume       = {494},
  year         = {2009},
}

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