The C-Band All-Sky Survey: instrument design, status, and first-look data

The C-Band All-Sky Survey (C-BASS) aims to produce sensitive, all-sky maps of diffuse Galactic emission at 5 GHz in total intensity and linear polarization. These maps will be used (with other surveys) to separate the several astrophysical components contributing to microwave emission, and in particular will allow an accurate map of synchrotron emission to be produced for the subtraction of foregrounds from measurements of the polarized Cosmic Microwave Background. We describe the design of the analog instrument, the optics of our 6.1 m dish at the Owens Valley Radio Observatory, the status of observations, and first-look data.

[1]  R. Davies.  On the Nature of the Cygnus-X Radio Source as Derived from Observations in the Continuum and at the Hydrogen-Line Frequency , 1957 .

[2]  Martin J. Rees,et al.  POLARIZATION AND SPECTRUM OF THE PRIMEVAL RADIATION IN AN ANISOTROPIC UNIVERSE. , 1968 .

[3]  C. G. T. Haslam,et al.  A 408 MHz all-sky continuum survey. I - Observations at southern declinations and for the North Polar region , 1981 .

[4]  W. Reich,et al.  A radio continuum survey of the northern sky at 1420 MHz. II , 1986 .

[5]  U. Seljak,et al.  An all sky analysis of polarization in the microwave background , 1996, astro-ph/9609170.

[6]  Albert Stebbins,et al.  Statistics of cosmic microwave background polarization , 1997 .

[7]  George D. Nicolson,et al.  The Rhodes/HartRAO 2326‐MHz radio continuum survey , 1998 .

[8]  P. Reich,et al.  A radio continuum survey of the southern sky at 1420 MHz - The atlas of contour maps , 2001 .

[9]  M. Zaldarriaga,et al.  Benchmark parameters for CMB polarization experiments , 2002, astro-ph/0210096.

[10]  M. Halpern,et al.  Design, Implementation, and Testing of the Microwave Anisotropy Probe Radiometers , 2003 .

[11]  Michael Seiffert,et al.  Offset balancing in pseudo-correlation radiometers for CMB measurements , 2003 .

[12]  J. Bond,et al.  Polarization Observations with the Cosmic Background Imager , 2001, Science.

[13]  D. Barkats,et al.  First Measurements of the Polarization of the Cosmic Microwave Background Radiation at Small Angular Scales from CAPMAP , 2005 .

[14]  W. Imbriale,et al.  Antennas for the array-based deep space network: current status and future designs , 2005, 2005 IEEE Aerospace Conference.

[15]  John E. Carlstrom,et al.  Degree Angular Scale Interferometer 3 Year Cosmic Microwave Background Polarization Results , 2005 .

[16]  T. L. Landecker,et al.  An absolutely calibrated survey of polarized emission from the northern sky at 1.4 GHz. Observations , 2005, astro-ph/0510456.

[17]  P. A. R. Ade,et al.  A Measurement of the CMB EE Spectrum from the 2003 Flight of BOOMERANG , 2005, astro-ph/0507514.

[18]  J. R. Bond,et al.  Implications of the Cosmic Background Imager Polarization Data , 2007 .

[19]  O. King,et al.  Compact broadband planar orthomode transducer , 2007, 0709.1777.

[20]  Edward J. Wollack,et al.  Three Year Wilkinson Microwave Anistropy Probe (WMAP) Observations: Polarization Analysis , 2006, astro-ph/0603450.

[21]  Matias Zaldarriaga,et al.  CMBPol Mission Concept Study Probing Ination with CMB Polarization , 2008, 0811.3919.

[22]  Edward J. Wollack,et al.  FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE * OBSERVATIONS: COSMOLOGICAL INTERPRETATION , 2008, 0803.0547.

[23]  UK,et al.  Design, development and verification of the 30 and 44 GHz front-end modules for the Planck Low Frequency Instrument , 2009, 1001.4743.

[24]  M. Halpern,et al.  FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: GALACTIC FOREGROUND EMISSION , 2008, 0803.0715.