A study of the 15-μm quasars in the ELAIS N1 and N2 fields

Afonso-Luis, A.; Hatziminaoglou, E.; Pérez-Fournon, I.; González-Solares, E. A.; Rowan-Robinson, M.; Vaccari, M.; Lari, C.; Serjeant, S.; Oliver, S.; Hernán-Caballero, A. and Montenegro-Montes, F. M. (2004). A study of the 15-μm quasars in the ELAIS N1 and N2 fields. Monthly Notices of the Royal Astronomical Society, 354(4) pp. 961–970.

DOI: https://doi.org/10.1111/j.1365-2966.2004.08264.x


This paper discusses the properties of the European Large Area ISO Survey (ELAIS) 15-μm quasars and tries to establish a robust method of quasar selection for future use within the Spitzer Wide-Area Infrared Extragalactic Survey (SWIRE) framework. The importance of good-quality ground-based optical data is stressed, both for the selection of candidates and for the estimation of photometric redshifts. Colour-colour plots and template fitting are used for these purposes. The properties of the 15-μm quasar sample, including variability and black hole masses, are studied and compared to the properties of other quasars that lie within the same fields but have no mid-infrared counterparts. The two subsamples do not present substantial differences and are believed to come from the same parent population.

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