NIKA run#3 October 2011 Report on data analysis February 2012 F. -Xavier Désert on behalf of the Nika team F. -Xavier Désert IRAM NIKA 8 February 2012 p. 1/21
Basics Run #3 motivations : – – Test cryocooler Test the new magnetic shielding Test photometry with a new method Test an improved 1 mm channel Moreover – Show the ability to go deeper – Use New beam splitter F. -Xavier Désert IRAM NIKA 8 February 2012 p. 2/21
Characteristics • 2 channels readout with 2 independent coaxial cable pairs and electronics • 2 x 150 timeline outputs at 22 Hz • about 80 @2 mm, 90@1 mm valid kids (+10 off resonance at 2 mm) • FWHM: 17” • Pointing accuracy determination: <2 arcsecond per detector • Array pointing accuracy: < 1 arcsec F. -Xavier Désert IRAM NIKA 8 February 2012 p. 3/21
Raw data file necessary for Quick Look Analysis and instrument control IDL routine transforming to fits file (Juan, Xavier) Imported to IMBFITS (Albrecht, Robert) according to an agreed-upon format (doc) Real-time of fits files was not available during the campaign Fits files will be available during the next run and after each scan, via a C-program interfaced with data acquisition program F. -Xavier Désert IRAM NIKA 8 February 2012 p. 4/21
Systematic effects Common glitches – simultaneous, one sample affected, widely varying intensity, seen on the off resonance ---> electronic cross-talk plateau on Mars – ---> attributed to the same effect (cross talk) Jumps in the data aligned in a straight oblique line on the 2 arrays drifting in time across the line – ---> A flying bug is a likely culprit. This occurs rarely. No other jumps : the magnetic shield worked wonders. F. -Xavier Désert IRAM NIKA 8 February 2012 p. 5/21
Focal Plane Geometry Linear fit to the expected position Mopsic method (Robert) IDL-based multi-beam fitter (Nicolas, Juan, Alain) Polynomial distortion enough Larger than expected Beam width is larger than expected Beam and distortion are correlated → optical effect F. -Xavier Désert IRAM NIKA 8 February 2012 p. 6/21
FPG kid position 4 scans F. -Xavier Désert IRAM NIKA 8 February 2012 p. 7/21
FPG kid FWHM F. -Xavier Désert IRAM NIKA 8 February 2012 p. 8/21
FPG optics F. -Xavier Désert IRAM NIKA 8 February 2012 p. 9/21
Photometry Relative photometry Rf_d. Id. Q method provides a big improvement with respect to 2010 run A new improved method based on polynomial fitting using I, Q, d. I, d. Q is tested. – Cannot be real time, but after each scan F. -Xavier Désert IRAM NIKA 8 February 2012 p. 10/21
3 rd degree Polynomial F. -Xavier Désert IRAM NIKA 8 February 2012 p. 11/21
3 rd degree Polynomial F. -Xavier Désert IRAM NIKA 8 February 2012 p. 12/21
Relative Photometry 10 hours later F. -Xavier Désert IRAM NIKA 8 February 2012 p. 13/21
Absolute Photometry Calibrated on Uranus Tau correction incorrect and based on taumeter (Xavier and Phil working on real time total power estimation of opacities) Neptune, MWC 349, quasars Has been tested on the 18 and 19 th Oct data Compared with Pd. B (Samuel) or RJ for Uranus Neptune 3 C 84 F. -Xavier Désert IRAM NIKA MWC 349 8 February 2012 p. 14/21
Map making In-house Real time Mopsic after-scan real time offline processing – – – IDL custom routines (IPAG) Blast-based routines (Cardiff) IDL based noise decorrelation method (LPSC) Selenepix (IAS) Scanamorphos (IAP) F. -Xavier Désert IRAM NIKA 8 February 2012 p. 15/21
F. -Xavier Désert IRAM NIKA 8 February 2012 p. 16/21
M 82 F. -Xavier Désert IRAM NIKA 8 February 2012 p. 17/21
Sky and Electronic noise Decorrelation F. -Xavier Désert IRAM NIKA 8 February 2012 p. 18/21
Sensitivity NFA 2 mm Flux from final det avg is 9. 5 +- 0. 8 m. Jy NFB 1 mm Flux from final det avg is 24. 2 +- 7. 6 ½ hour, 7 scans 1 F. -Xavier Désert IRAM NIKA 8 February 2012 p. 19/21
Sensitivity APM source NFA Flux from final det avg is NFB Flux from final det avg is 1. 6 +1. 2 +- 0. 6 m. Jy 2. 2 NEFD (m. Jy. s 1/2 /beam) A&B 22. 7 81. 0 Total Exposure Time (s) 3024 Valid data integration time (and ratio with Exp Time) 2963 0. 980 Total Telescope time (and ratio with Exp Time) 4173 1. 380 F. -Xavier Désert IRAM NIKA 8 February 2012 p. 20/21
2011 run #3, Spectral bandpasses (dot=run #2) F. -Xavier Désert IRAM NIKA 8 February 2012 p. 21/21
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