We report the results of a multi-wavelength study in the North Ecliptic Pole (NEP) deep field and examine the far infrared-radio correlation (FIRC) for high and low redshift objects. We have found a correlation between the GMRT data at 610 MHz and the Herschel data at 250μm that has been used to define a spectral index. This spectral index shows no evolution against redshift. As a result of the study, we show a radio colour-infrared diagram that can be used as a redshift indicator.

ABSTRACT
1. INTRODUCTION
2. FIR-RADIO CORRELATION
3. SPECTRAL INDEX
4. RADIO FLUX - COLOUR DIAGRAMS
5. CONCLUSIONS
REFERENCES

• Laia Barrufet(RAL Space, The Rutherford Appleton Laboratory)
• Glenn J. White(RAL Space, The Rutherford Appleton Laboratory/Dept of Physical sciences, The Open University)
• Chris Pearson(RAL Space, The Rutherford Appleton Laboratory/Dept of Physical sciences, The Open University)
• Stephen Serjeant(Dept of Physical sciences, The Open University)
• Tanya Lim(RAL Space, The Rutherford Appleton Laboratory)
• Hideo Matsuhara(Inst of Space and Astronautical Science, Japan Aerospace Exploration Agency)
• Nagisa Oi(Inst of Space and Astronautical Science, Japan Aerospace Exploration Agency)
• Marios Karouzos(CEOU-Astronomy Program, Department of Physics & Astronomy, Seoul National University)
• AKARI-NEP Team(Inst of Space and Astronautical Science, Japan Aerospace Exploration Agency)