The European Large Area ISO survey: Optical identifications of 15-mu m and 1.4-GHz sources in N1 and N2

Gonzalez-Solares, Eduardo and Perez-Fournon, Ismael and Rowan-Robinson, Michael and Oliver, Seb and Vaccari, Mattia and Lari, C. and Irwin, M.J. and McMahon, R.G. and Hodgkin, S. and Ciliegi, P. and Serjeant, Stephen and Willott, C.J. (2005) The European Large Area ISO survey: Optical identifications of 15-mu m and 1.4-GHz sources in N1 and N2. Monthly Notices of the Royal Astronomical Society, 358 (2). pp. 333-340. ISSN 0035-8711. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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We present the multiwavelength properties and catalogue of the 15 mu m 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 mu m and 1.4 GHz, respectively, down to flux limits of S-15 = 0.5 mJy and S-1.4GHz = 0.135 mJy. We find that similar to 92 per cent of the 15 mu m 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' similar to 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.

Item Type: Article
Additional information: 29 BLACKWELL PUBLISHING LTD 906VZ
Uncontrolled keywords: stars : formation; galaxies : evolution; galaxies : starburst; cosmology : observations; infrared :\galaxies HUBBLE-DEEP-FIELD; DIGITAL SKY SURVEY; DATA REDUCTION; SOUTHERN FIELD; SOURCE COUNTS; ELAIS; GALAXIES; WFS; IR
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Maggie Francis
Date Deposited: 06 Sep 2008 00:48
Last Modified: 18 Jul 2014 10:50
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