Final pager
The power spectra presented here are analyzed from the input HEALPix maps
using the
S2HAT
and
PS2HAT
libraries (see also
arXiv:0903.2350).
Custom MATLAB mex bindings
interface to the (P)S2HAT library and permit us to finishing processing using
the MATLAB pipeline used for standard BICEP/Keck analysis (i.e. our FFT steps
are replaced with (P)S2HAT, but debiasing, suppression factor correction, etc
follow the same code path as used in BK analysis; see for example
arXiv:1403.3985 and
arXiv:1603.05976
for more details on the BK pipeline).
Short summary of processing details:
- This posting makes use of and presents the 02.00, 02.01, and
02.02 maps as discussed in
Experiment Definitions.
1000 realizations of noise and (variable \(A_L\)) lensed-ΛCDM + noise
+ foregrounds (aka combined) input maps have been processed
to power spectra.
- No E-to-B leakage debias has been applied. The use of the PS2HAT
library minimizes leakage such that this should be unnecessary
(and no unlensed-ΛCDM sims were processed from which the debias
would normally be taken).
- Suppression factors (from the beam function and any
algorithmic/processing losses) are computed from so-called “direct
BPWFs” for each frequency band. The cross-frequency BPWFs are assumed
to be the geometric mean of the auto-frequency BPWFs. See
BK-VII §7.3
for a complete description of the method.
- The “real” data points are just realization 0 of the combined maps
data set.
Legend for first half of the "Figure types":
- Thick red :
lensed-ΛCDM scalars
- Thick black :
Real data
- Colored : lensed-ΛCDM + noise + foreground realizations
Legend for second half of the "Figure types":
spectra
- thick red
: lensed-ΛCDM
- thin gray :
s+n+f simulations with lensed-ΛCDM (sim type 5) and
foregrounds (sim type 3) as signal, debiased with noise (sim type
6)
- thick gray :
mean of sims (thin gray)
- red points with blue error bars :
real data, debiased with the noise, uncertainties from the spread of
the s+n+f sims (thin gray)
bp devs
- thin gray :
s+n+f sims
- thin red :
1 sigma contours
- thin green :
2 sigma contours
- thick black + markers :
real data
- red markers :
bins that go into chi2 analysis
Note: The contours mark the simulated bandpower in each bin closest
to the respective percentile.
chi2
- red vertical :
real data
- blue :
distribution from s+n+f sims
- green :
chi2 probability distribution fitted to blue
sum bp devs
- red vertical :
real data
- blue :
distribution from s+n+f sims
uncertainties
- red :
std of s+n+f sims
- blue :
std of noise-only sims
Note: Remember that bandpower is a variance. Hence bandpower error bar
is the std of a variance. This means noise and sample fluctuation
components straight add, no quadrature — i.e. the difference between blue
and red is the signal fluctatution component.