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The European Large Area ISO Survey (ELAIS): Optical Identifications of 15 µm and 1.4GHz sources in N1 and N2

By E. A. Gonzalez-solares, I. Perez-fournon, M. Rowan-robinson, S. Oliver, M. Vaccari, C. Lari, M. Irwin, R. G. Mcmahon, S. Hodgkin, P. Ciliegi, S. Serjeant and C. J. Willott


We present the optical identification of mid-IR and radio sources detected in the European Large Area ISO Survey (ELAIS) areas N1 and N2. Using the r ’ band optical data from the Wide Field Survey we apply a likelihood ratio method to search for the counterparts of the 1056 and 691 sources detected at 15µm and 1.4GHz respectively, down to flux limits of S15 = 0.5mJy and S1.4 GHz = 0.135mJy. We find that ∼92 % of the 15µm ELAIS sources have an optical counterpart down to the magnitude limit of the optical data, r’=24. All mid-IR sources with fluxes S15 � 3mJy have an optical counterpart. The magnitude distribution of the sources shows a well defined peak at relatively bright magnitudes r’∼18. About 20 % of the identified sources show a point-like morphology; its magnitude distribution has a peak at fainter magnitudes than those of galaxies. The mid-IR-to-optical and radio-to-optical flux diagrams are presented and discussed in terms of actual galaxy models. Objects with mid-IR-tooptical fluxes larger than 1000 are found that can only be explained as highly obscure

Year: 2008
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