Sloan Digital Sky Survey quasars in the Spitzer Wide-Area Infrared Extragalactic Survey (SWIRE) ELAIS N1 field:: Properties and spectral energy distributions

We present a mid-infrared ( MIR) analysis of 35 quasars with spectroscopic redshifts selected from the Spitzer Wide-Area Infrared Extragalactic Survey ( SWIRE). We discuss their optical and MIR colors and show that these quasars occupy well-defined regions in MIR color-color space. We examine the issue of type 1 active galactic nuclei candidate selection in detail and propose new selection methods based on MIR colors. The available multiband data allow us to construct two new, well-sampled quasar templates, covering wavelengths from the ultraviolet to the MIR.