Notes on C-BASS N raster analysis and polarization calibration

ACT - August 19, 2013

Schedules Run

17-Jul-2013:13:53:34 	 17-Jul-2013:21:57:50 	 /home/cbass/gcpCbass/control/sch/source_raster_8x4x0.05.sch( 8h   , taua )
16-Jul-2013:13:48:20 	 16-Jul-2013:21:08:10 	 /home/cbass/gcpCbass/control/sch/source_raster_8x4x0.05.sch( 10h    , m42)


Analaysis notes

Each raster was analysed using matlab code using the pipeline to calibrate it in terms of noise diode units only. Rfi flagging and load corrections were applied.

The individual raster scans were saved as .fits files along with a .fits file for the complete dataset.

Polarization calibration matrices were determined for M42 and TauA.

The data The data were mapped using a simple binning code in matlab - in Az/El and in RA/DEC.In each case the data were mapped before and after parallactic angle rotations and with and without polarization calibration.

The data were also mapped using descart, primarily to check consistency and to check that the polarization was being correctly recovered.


Results - TauA

Az-El maps made in matlab

1) Uncalibrated data without PA rotation



2) Uncalibrated data with PA rotation



3)Calibrated data without PA rotation



4)Calibrated data with PA rotation




RA-DEC raster maps made in descart, .png made in hidl using cartview

A) dpsi(U) = -pi/4

1) Uncalibrated I data



2) Uncalibrated P data



B) dpsi(U) = +pi/4

1) Uncalibrated I data



2) Uncalibrated P data




RA-DEC cut-outs from August 2013 all-sky map descart , .png made in hidl using cartview

A) dpsi(U) = -pi/4

1) Uncalibrated I data



2) Uncalibrated P data



B) dpsi(U) = +pi/4

1) Uncalibrated I data



2) Uncalibrated P data



Results - M42

Az-El maps made in matlab

1) Uncalibrated data without PA rotation



2) Uncalibrated data with PA rotation



3)Calibrated data without PA rotation



4)Calibrated data with PA rotation




RA-DEC raster maps made in descart, .png made in hidl using cartview

A) dpsi(U) = -pi/4

1) Uncalibrated I data



2) Uncalibrated P data



B) dpsi(U) = +pi/4

1) Uncalibrated I data



2) Uncalibrated P data




RA-DEC cut-outs from August 2013 all-sky map descart , .png made in hidl using cartview

A) dpsi(U) = -pi/4

1) Uncalibrated I data



2) Uncalibrated P data



B) dpsi(U) = +pi/4

1) Uncalibrated I data



2) Uncalibrated P data