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Deep, high resolution radio imaging of the Subaru/XMM- Newton Deep Survey field

Deep, high resolution radio imaging of the Subaru/XMM- Newton Deep Survey field. Vinodiran Arumugam Institute for Astronomy, University of Edinburgh In collaboration with: R.J. Ivison (UK ATC, IfA ), Edo Ibar (UK ATC),

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Deep, high resolution radio imaging of the Subaru/XMM- Newton Deep Survey field

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  1. Deep, high resolution radio imaging of the Subaru/XMM-Newton Deep Survey field Vinodiran Arumugam Institute for Astronomy, University of Edinburgh In collaboration with: R.J. Ivison (UK ATC, IfA), Edo Ibar (UK ATC), C. Simpson (Liverpool John Moores University) & M. Cirasuolo (IfA, UK ATC)

  2. Outline • Extragalactic radio surveys at 1.4 GHz • An overview of the survey (hereafter UDS20) and some results • The nature of the radio population

  3. Extragalactic Radio Surveys @ 1.4 GHz Sensitive to star-forming galaxies (SFGs) and active galactic nuclei (AGNs) Unaffected by dust obscuration Dust-enshrouded SFGs Torus-obscured AGNs High-resolution proxy for submillimetre and far-infrared (FIR) observations exploits the FIR-radio correlation Ikarashi et al. 2010, Michalowski et al. 2011 (in prep.) Simpson C. et al., 2006, MNRAS,372, 741 Condon 1992

  4. UDS20: Overview • Mosaic of 14 pointings (red circles) in the Subaru/XMM-Newton Deep Survey Field ~ 1.3 deg2 • 160 hrs in A,B and C->DnC configurations of the NRAO Very Large Array at 1.4 GHz • High resolution ≈ 1.82” UDS • rms noise <8 μJy beam-1 towards the centre and • Central 0.7 deg2 - ~10 μJy beam-1 • Coincides with UKIDSS Ultra Deep Survey (UDS) region • Yielded a 4σ (local rms) catalogue with 6861 sources Contours at 8 (blue), 10 (red), 15 (green), 20 (gold), 30 (purple), 50 (cyan) & 100 (yellow) μJy beam-1

  5. UDS20: multiwavelength data

  6. 1.4 GHz Radio Source Counts

  7. The radio population Faint radio population consists of a mix of AGNs and SFGs AGN AGN Robust AGN/SFG discrimination needed! AGN L1.4 GHz > 1024.5 W Hz-1

  8. AGN/SFG diagnostics * * AGN AGN O X-ray sources IRAC colour-colour plot (Stern et al. 2005)

  9. AGN/SFG diagnostics IRAC-MIPS colour-colour plot (Ivison et al. 2004)

  10. Summary • Extragalactic radio surveys play an important role in understanding galaxy evolution • Sensitive to synchrotron emission from SFGs and AGNs • UDS20 has deep, high-resolution radio data • Complemented by multi-wavelength data, this should allow for the study of the faint radio population • The faint radio population is believed to consist of a mix of AGNs and SFGs • Robust starburst/AGN diagnostics needed to disentangle the two – work in progress…

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