Reference : Near- and mid-infrared colours of star-forming galaxies in European Large Area ISO Su...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/32021
Near- and mid-infrared colours of star-forming galaxies in European Large Area ISO Survey fields
English
Vaisanen, Petri [Observatory, PO Box 14, University of Helsinki, Finland > > > >]
Morel, Thierry [Inter University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007, India > > > >]
Rowan-Robinson, M. [Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology & Medicine, Prince Consort Road, London SW7 2BZ]
Serjeant, S. [Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology & Medicine, Prince Consort Road, London SW7 2BZ]
Oliver, S. [Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology & Medicine, Prince Consort Road, London SW7 2BZ;]
Sumner, T. [Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology & Medicine, Prince Consort Road, London SW7 2BZ]
Crockett, H. [Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology & Medicine, Prince Consort Road, London SW7 2BZ]
Gruppioni, C. [Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy;]
Tollestrup, E. V. [Boston University, Department of Astronomy, 725 Commonwealth Avenue, Boston, MA 02215, USA;]
1-Dec-2002
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
337
1043-1058
Yes (verified by ORBi)
International
0035-8711
Oxford
United Kingdom
[en] surveys ; galaxies: evolution ; galaxies: starburst ; infrared: galaxies ; infrared: stars
[en] We present J- and K-band near-infrared (near-IR) photometry of a sample of mid-infrared (mid-IR) sources detected by the Infrared Space Observatory (ISO) as part of the European Large Area ISO Survey (ELAIS) and study their classification and star-forming properties. We have used the Preliminary ELAIS Catalogue for the 6.7-μm (LW2) and 15-μm (LW3) fluxes. All of the high-reliability LW2 sources and 80 per cent of the LW3 sources are identified in the near-IR survey reaching K~ 17.5 mag. The near-IR/mid-IR flux ratios can effectively be used to separate stars from galaxies in mid-IR surveys. The stars detected in our survey region are used to derive a new accurate calibration for the ELAIS ISOCAM data in both the LW2 and LW3 filters. We show that near- to mid-IR colour-colour diagrams can be used to classify galaxies further, as well as to study star formation. The ELAIS ISOCAM survey is found mostly to detect strongly star-forming late-type galaxies, possibly starburst-powered galaxies, and it also picks out obscured active galactic nuclei. The ELAIS galaxies yield an average mid-IR flux ratio LW2/LW3 = 0.67 +/- 0.27. We discuss the f[SUB]ν[/SUB](6.7 μ m)/f[SUB]ν[/SUB](15 μ m) ratio as a star formation tracer using ISO and IRAS data of a local comparison sample. We find that the f[SUB]ν[/SUB](2.2 μ m)/f[SUB]ν[/SUB](15 μ m) ratio is also a good indicator of activity level in galaxies and conclude that the drop in the f[SUB]ν[/SUB](6.7 μ m)/f[SUB]ν[/SUB](15 μ m) ratio seen in strongly star-forming galaxies is a result of both an increase of 15-μm emission and an apparent depletion of 6.7-μm emission. Near-IR together with the mid-IR data make it possible to estimate the relative amount of interstellar matter in the galaxies.
http://hdl.handle.net/2268/32021
10.1046/j.1365-8711.2002.06006.x
http://adsabs.harvard.edu/abs/2002MNRAS.337.1043V
http://de.arxiv.org/abs/astro-ph/0208412

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