Measuring CMB Polarization from the Garden State with CAPMAP Colin - - PowerPoint PPT Presentation

Measuring CMB Polarization from the Garden State with CAPMAP

Colin Bischoff The Path to CMBPol Workshop July 1, 2009

Overview of CAPMAP Experiment

Three observing seasons from 2003-2005 at the Crawford Hill 7-meter antenna in Holmdel, New Jersey . Third season consisted of 1658 hours from December 2004 through April 2005. Sixteen HEMT-based correlation polarimeters: 12 operating at 90 GHz (3.3' FWHM) 4 operating at 40 GHz (6.5' FWHM) E-mode polarization measured in 7 bins from 200 < < 3000 with total detection significance of B-mode polarization 95% confidence upper limit of Collaboration between U. of Chicago, Princeton, U. of Miami, and JPL

(C. Bischoff, L. Hyatt, J. McMahon, G. Nixon, D. Sambtleben,

• K. Smith, K. Vanderlinde, D. Barkats, P

. Farese, T. Gaier,

• J. Gunderson, M. Hedman, S. Staggs, B. Winstein)

CAPMAP Ring Scan

Circular scan about the NCP with 0.725 radius and 21 second period Ring scan introduces a large signal in total power data Good noise uniformity and complete parallactic angle coverage every 12 hours

• 2
• 1

1 2

• 2
• 1

1 2

20 40 60 time [seconds] 105 106 107 d0 response [mV]

Removal of Atmospheric Modes

Five parameter fit to each 21 second orbit

Removal of Atmospheric Modes

Five parameter fit to each 21 second orbit 100K <150mK 500mK <5mK TP Pol

Removal of Atmospheric Modes

Five parameter fit to each 21 second orbit Bad weather was identified using the goodness of fit for the five parameter model to total power data on two time scales

Removal of Atmospheric Modes

Five parameter fit to each 21 second orbit

10 20 χ2 100 200 300 400 number of cycles

After removing the model, polarization data is consistent with a distribution, indicating that no additional filtering is necessary .

Performance Divisions House- keeping Divisions Spectral Divisions Cryostat Divisions Time Divisions

• 50

50

• 50

50

• 20

20 40

• 20

20 40

I-> Q Le a k a g e Gro u n d

• sy

n ch ro n

• u

s St ru ct u re 1 /f N

• ise

M irro r W a rm v s Co ld LN A W a rm v s Co ld IF W a rm v s Co ld S2 v s S0 + S1 S1 v s S0 + S2 S0 v s S1 + S2 3 v s 0 + 1 + 2 2 v s 0 + 1 + 3 1 v s 0 + 2 + 3 v s 1 + 2 + 3 Qu a d ra t u re M

• rn

in g v s Ev e n in g D a y v s N ig h t Pe rio dII v sIII Pe rio dI v sIII Pe rio dI v sII

Category Null Test Flat Bandpower [µK2] Flat Bandpower [µK2] Flat Bandpower [µK2] Flat Bandpower [µK2]

Q-Band EE Q-Band BB W-Band EE W-Band BB

Null T est Suite

Thirty-six different null maps were constructed from different divisions of the data and analyzed. Results of the nulltest suite were used to tune weather cuts, gain models, etc, for a "blind" analysis

2 4 6 8 10 5 10 15 20 25 30 χ2 to Zero Number of Null Tests

Null T est Suite

Full null test results show no evidence of contamination = 77.8 for 72 degrees of freedom (P .T.E. = 30%) Not included in the null test suite is the null map made from differencing the 40 GHz and 90 GHz data, which provides evidence that foregrounds are not contributing significant power.

1000 2000 3000

• 40
• 20

20 40 60 1000 2000 3000

l(l+1)Cl / (2π) [µK2]

l l

Results from T wo Independent Pipelines

Separate analyses produced consistent results using complementary methods. Systematic errors are estimated from many full season simulations and found to be sub-dominant. EE BB

500 1000 1500 2000 2500

• 50

50 100 150

MAXIPOL DASI CBI BOOMERa nG WMAP QUAD CAPMAP 05 W-Ba nd CAPMAP 08 Q+ W

l(l+ 1)Cl / 2π [µK2] l

500 1000 1500 2000 2500 10

• 3

10

• 2

10

• 1

1 10 10

2

10

3

MAXIPOL 06 DASI 05 CBI 05 BOOMERa nG 02 QUa D 07 WMAP 06 CAPMAP 08 Q+ W

l(l+ 1)Cl / (2π) [µK2] l