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C-BASS – The C-Band All Sky Survey

Oxford University – Oliver King, Christian Holler, Mike Jones, Angela Taylor, Matthew Brock, Jaya John John, Paul Grimes Secondary Optics, Feed, Polarimeter/Receiver, Cryogenics, Backend

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C-BASS – The C-Band All Sky Survey

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  1. Oxford University – Oliver King, Christian Holler, Mike Jones, Angela Taylor, Matthew Brock, Jaya John John, Paul Grimes Secondary Optics, Feed, Polarimeter/Receiver, Cryogenics, Backend Manchester University – Rod Davies, Richard Davis Clive Dickinson, Tess Jaffe, Paddy Leahy, Stuart Lowe, Neil Roddis, Althea Wilkinson, Peter Wilkinson Low Noise Amplifiers CalTech/JPL/OVRO – Dayton Jones, Russ Keeney, Charles Lawrence, Erik Leitch, Stephen Muchovej, Tim Pearson, Tony Readhead, Graça Rocha, Matthew Stevenson Northern Survey, OVRO Antenna, Backend and Data Acquisition Rhodes University/HartRAO – Roy Booth, Charles Copley, Justin Jonas Southern Survey, MeerKAT Support Site Antenna C-BASS – The C-Band All Sky Survey

  2. 4.5-5.5 GHz all sky survey of intensity and polarization 0.85° FWHM maps to 100 µK rms noise per pixel (I, Q and U) Systematics below 5% of noise Science goals: Survey of diffuse galactic synchrotron emission Provide synchrotron foreground template for CMB missions Study galactic magnetic field and interstellar medium Instrument: Combined correlation radiometer and pseudo-correlation polarimeter with e-Merlin LNAs Actively controlled 4 K reference loads Profiled corrugated horn and planar OMT 6.1m dish at OVRO and 7.1m dish at MeerKAT support site – each with new shaped 2ndry and absorber tunnel First receiver – analogue backend for South African site Second receiver – all-digital backend for OVRO (for RFI excision) Dedicated RFI monitor at OVRO C-BASS – The C-Band All Sky Survey

  3. Receiver and optics

  4. Both antennas on-site and undergoing commissioning 1st receiver, secondary and foam support to be shipped to OVRO Weds/Thurs Receiver tested on sky in Oxford – Tsys < 20K, stability good Will be tested at OVRO with initial survey before shipping to MeerKAT site 2nd (digital backend) receiver construction to start soon Planned ship date to OVRO – Feb 2010 OVRO commissioning Jul-Sept 2009 Initial Northern survey/testing - Sept 2009-Jan 2010 Southern survey - 1 year from Mar 2010 Status and Timescales • Northern survey – 1 year from Sept 2009 • Data release 2011/12

  5. I, Q and U maps – Planck sky model Compare Planck to Planck + C-BASS (Single pixel, MCMC parameter fits) Typical high latitude pixel (2° beam): Spectral index bias reduced – Stokes I -0.14 to 0.015; Q,U -0.16 to 0.03 70 GHz synchrotron amplitude error – Stokes I 0.09 μK to 0.03 μK; Q,U 0.3 μK to 0.045 μK 70 GHz synchrotron bias – Stokes I 0.9 μK to 0.15 μK; Q,U 0.015 μK to 0.003 μK 5-7 times reduction in synchrotron residuals in CMB band Predictions

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