1 / 21

NIKA run#3 October 2011 Report on data analysis February 2012

NIKA run#3 October 2011 Report on data analysis February 2012 F.-Xavier Désert on behalf of the Nika team. Basics. Run #3 motivations : Test cryocooler Test the new magnetic shielding Test photometry with a new method Test an improved 1mm channel Moreover Show the ability to go deeper

brit
Download Presentation

NIKA run#3 October 2011 Report on data analysis February 2012

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NIKA run#3 October 2011 Report on data analysis February 2012 F.-Xavier Désert on behalf of the Nika team

  2. Basics Run #3 motivations : Test cryocooler Test the new magnetic shielding Test photometry with a new method Test an improved 1mm channel Moreover Show the ability to go deeper Use New beam splitter

  3. Characteristics 2 channels readout with 2 independent coaxial cable pairs and electronics 2x150 timeline outputs at 22 Hz about 80 @2mm, 90@1mm valid kids (+10 off resonance at 2mm) FWHM: 17” Pointing accuracy determination: <2 arcsecond per detector Array pointing accuracy: < 1arcsec

  4. Raw data 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

  5. 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.

  6. 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

  7. FPG kid position 4 scans

  8. FPG kid FWHM

  9. FPG optics

  10. Photometry Relative photometry Rf_dIdQ method provides a big improvement with respect to 2010 run A new improved method based on polynomial fitting using I, Q, dI, dQ is tested. Cannot be real time, but after each scan

  11. 3rd degree Polynomial

  12. 3rd degree Polynomial

  13. Relative Photometry 10 hours later

  14. 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, MWC349, quasars Has been tested on the 18 and 19th Oct data Compared with PdB (Samuel) or RJ for Uranus Neptune Neptune 3C84 MWC349

  15. 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)

  16. M82

  17. Sky and Electronic noise Decorrelation

  18. Sensitivity NFA 2mm Flux from final det avg is 9.5 +- 0.8 mJy NFB 1mm Flux from final det avg is 24.2 +- 7.6 ½ hour, 7 scans 1

  19. Sensitivity APM source NFA Flux from final det avg is 1.6 +- 0.6 mJy NFB Flux from final det avg is 1.2 +- 2.2 NEFD (mJy.s1/2 /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

  20. 2011 run #3, Spectral bandpasses(dot=run #2)

More Related