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.; Montenegro-Montes, F. M.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society, Volume 354, Issue 4, pp. 961-970.

Fecha de publicación:
11
2004
Número de autores
11
Número de autores del IAC
5
Número de citas
8
Número de citas referidas
7
Descripción
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.