The European Large Area ISO Survey: optical identifications of 15-μm and 1.4-GHz sources in N1 and N2期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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The European Large Area ISO Survey: optical identifications of 15-μm and 1.4-GHz sources in N1 and N2

Authors:	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 C J Willott

Institution:	Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA;Instituto de Astrofísica de Canarias, C/Via Lactea, s/n, La Laguna E38200, Spain;Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology &Medicine, Prince Consort Road, London SW7 2BZ;Astronomy Centre, Department of Physics and Astronomy, University of Sussex, Falmer, Brighton BN1 9QJ;Dipartamento di Astronomia, Universitai Padova, Vicolo Osservatorio 5, I-35122 Padova, Italy;Istituto di Radioastronomia, Via P. Gobetti 101, Bologna 40129, Italy;Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy;Centre for Astrophysics and Planetary Science, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7HR;Herzberg Institute of Astrophysics, National Research Council, 5071 West Saanich Road, Victoria, B. C. V9E 2E7, Canada

Abstract:	We present the multiwavelength properties and catalogue of the 15 μm and 1.4 GHz radio sources detected in the European Large Area ISO Survey ( ELAIS ) areas N1 and N2. Using the optical data from the Wide Field Survey we use a likelihood ratio method to search for the counterparts of the 1056 and 691 sources detected at 15 μm and 1.4 GHz, respectively, down to flux limits of S ₁₅= 0.5 mJy and S _1.4 GHz= 0.135 mJy . We find that ～92 per cent of the 15 μm ELAIS sources have an optical counterpart down to r '= 24 . All mid-infrared (IR) sources with fluxes S ₁₅≥ 3 mJy have an optical counterpart. The magnitude distribution of the sources shows a well-defined peak at relatively bright magnitudes r '～ 18 . The mid-IR-to-optical and radio-to-optical flux diagrams are presented and discussed in terms of actual galaxy models. About 15 per cent of the sources are bright galactic stars; of the extragalactic objects ～65 per cent are compatible with being normal or starburst galaxies and ～25 per cent active galactic nuclei (AGNs). Objects with mid-IR-to-optical fluxes larger than 100 are found, comprising ～20 per cent of the sample. We suggest that that these sources are highly obscured luminous and ultraluminous starburst galaxies and AGNs.

Keywords:	stars: formation galaxies: evolution galaxies: starburst cosmology: observations infrared: galaxies

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