26 research outputs found
The evolution of type 1 AGN at 15 μm from ELAIS
No full textWe present the first preliminary estimate of the evolution of type 1 AGNs at 15μm. A new sample of sources selected from the ELAIS-S1 survey has been used together with the RMS sample. The ELAIS-S1 survey covers an effective area of 2.2 deg2 (total: 4 deg2) down to 1.2 mJy at 15 μm. Spectroscopic identifications have been carried out in the range 17.2 < R < 20.0 at the 3.6m/ESO, NTT/ESO and 2dF/AAT. The luminosity function is steeper at bright luminosities in comparison to the previous estimates of Rush, Malkan & Spinoglio (1993). The evolution is compatible with a Pure Luminosity Evolution model with L(z) ~ L(0)(1+z)3.4
ELAIS: final band-merged catalogue
No full textThe catalog represents the final band-merged European Large-Area ISO Survey (ELAIS) Catalogue at 6.7, 15, 90 and 175{mu}m, and the associated data at U, g', r', i', Z, J, H, K and 20cm. Details about the origin of the survey, the observations, data reduction and optical identification are described in the paper. In addition to fluxes in the radio, infrared and optical passbands, spectroscopic redshifts are tabulated, where available. For the N1 and N2 areas, the Isaac Newton Telescope ugriz Wide Field Survey permits photometric redshifts to be estimated for galaxies and quasars
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Mid-FIR properties of ELAIS sources.
No full textWe present the properties of all the galaxies detected by ISO at 7, 15 and 90 microns in ELAIS northern fields. The spectral energy distribution (SED) of those 20 galaxies with IRAS detections can generally be well fitted by a predominant cirrus component plus a modest starburst contribution. Follow-up spectroscopy has shown that all the objects are emission-line galaxies but without a very intense star formation event. Most of the galaxies analyzed by means of optical R band photometry result to host an important exponential disk component, in good agreement with the SED IR modelling. We note that galaxies with morphological signs of perturbations seem to show slightly higher f15/f6.7 ratios, indicating that star formation could be more important in them. One of the objects is a broad-line, radio-quiet quasar at z=1.099; its spectral energy distribution indicates that it is a hyperluminous infrared galaxy (HLIG), the first HLIG detected in the ELAIS areas
ELAIS: ISOPHOT results using the MPIA-pipeline
No full textInternational audienceThe European Large Area ISO Survey (ELAIS) will provide infrared observations of 4 regions in the sky with ISO. Around 2000 Infrared sources have been detected at 7 and 15 μm (with ISOCAM), 90 and 175 μm (with ISOPHOT)) over 13 square degrees of the sky. We present the source extraction pipeline of the 90 μm ISOPHOT observations, describe and discuss the results obtained and derive the limits of the ELAIS observation strategy
ELAIS: Near-infrared observations of the southern fields
No full textInternational audienceThe European Large Area ISO Survey (ELAIS) is a survey of 4 main regions of the sky at 15 and 90 μm. The follow-up programmes from the ground are summarized. We present preliminary results from near-infrared (K-band) observations in the southern ELAIS fields. We show the histogramme distribution of the K-band magnitude for all objects in the observed regions. The ``stellarity'' index derived from the source extraction is also shown. We roughly find that 2/3 of the objects detected in the fields are elongated (i.e. galaxies). For a small sample of ISOPHOT detections, the corresponding NIR sources are classified as follows: a) 20% of stars: b) 70% of galaxies and c) 10% of interacting systems
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The European Large Area ISO Survey: a pathfinder for SIRTF.
No full textThe European Large Area ISO Survey, ELAIS, was the largest Open Time survey on the Infrared Space Observatory, ISO. It was designed to explore obscured galaxies and hence quantify the recent star-formation history of the Universe. We have recently completed our final reanalysis of the data, compiled band-merged catalogue products with associations across many wavelengths and released the data to the global astronomical community (http://astro.imperial.ac.uk/elais/). This paper summarizes some of the key results
The European Large Area ISO Survey: ISOPHOT Final Analysis - Number Counts
No full textInternational audienceThe European Large Area ISO Survey is a consortium of 26 institutes whose goal is to study the Infra-red objects and Infra-red background in 4 main areas of the sky using ISO. In this paper, we present the final analysis pipeline of the ISOPHOT data and will show the latest results extracted from the pipeline. We also present and discuss the number counts extracted from the ELAIS areas that extend the IRAS number count by an order of magnitude
GALEX UV Spectroscopy and Deep Imaging of LIRGs in the ELAIS S1 field
Get PDFThis paper has been published as part of the GALEX ApJL Special IssueThe ELAIS S1 field was observed by GALEX in both its Wide Spectroscopic and Deep Imaging Survey modes. This field was previously observed by the Infrared Space Observatory and we made use of the catalogue of multi-wavelength data published by the ELAIS consortium to select galaxies common to the two samples. Among the 959 objects with GALEX spectroscopy, 88 are present in the ELAIS catalog and 19 are galaxies with an optical spectroscopic redshift. The distribution of redshifts covers the range $
The European Large Area ISO Survey - ISOPHOT results using the MPIA-pipeline
No full textThe European Large Area ISO Survey (ELAIS) will provide Infrared observations of 4 regions in the sky with ISO. Around 2000 Infrared sources have been detected at 7 and 15 microns (with ISOCAM), 90 and 175 microns (with ISOPHOT)) over 13 square degrees of the sky. We present the source extraction pipeline of the 90 microns ISOPHOT observations, describe and discuss the results obtained and derive the limits of the ELAIS observational strategy
The European large area ISO survey: ELAIS
No full textInternational audienceThe European Large Area ISO Survey (ELAIS) has surveyed ~ 12 square degrees of the sky at 15 and 90 μ m and subsets of this area at 6.75 and 175 μ m using the Infrared Space Observatory (ISO). This project was the largest single open time programme executed by ISO, taking 375 hours of data. A preliminary catalogue of more than 1000 galaxies has been produced. In this paper we describe the goals of the project, describe the follow-up programmes that are in progress, and present some first scientific results including a provisional number count analysis at 15 and 90 μ m
