Index of /group/cmb/data_release/ps/5min

[ICO]NameLast modifiedSizeDescription

[DIR]Parent Directory  -
[   ]Cl10-Dec-2000 21:06 240
[TXT]FILES08-Dec-2000 10:55 1.1K
[   ]MAXIMA-1.tar10-Dec-2000 21:07 50K
[   ]beam08-Dec-2000 10:55 33K
[   ]beamerr08-Dec-2000 10:55 330
[   ]bin08-Dec-2000 10:55 100
[   ]fisher_1008-Dec-2000 10:55 1.7K
[   ]summary.dat08-Dec-2000 10:55 516
[   ]xb08-Dec-2000 10:55 81

This archive/directory contains the information on the power spectrum
and related data, e.g. beam filter function, Fisher matrix, that may
be necessary for using the MAXIMA-1 data (as published in Hanany et al
(2000) and Balbi et al (2000)).

---

Data Files:

Cl     -- bandpowers (power spectrum) and error in 10 bins (b)
	[<ell>] [Bandpower <l(l+1)C_l/(2pi)>_b/uK^2] [sig_l/uK^2]

	Bandpower_bin = <l(l+1)C_l/(2pi)>_bin
	the error, sig_l, in each bin is calculated from the diagonal
	elements of the correlation matrix, the inverse of the fisher
	matrix:
		sig_bin = sqrt[ (fisher^-1)_bin,bin ]

	IMPORTANT NOTE: we report here unorthogonalized bandpowers,
	unlike Table 2 of Hanany et al 2001. These are related by a
	simple linear transformation based on the fisher matrix (file
	fisher_10, below) as explained in, for example, BJK98.

FILES
      -- A short summary of the various data files.

MAXIMA_1.tar
      -- A tar file containing the entire contents of this director,
         including this README file.

beam   -- B_l, the experimental beam, convolved with the pixel window
          function, as in [Wu et al].  The first entry corresponds to
	  to l=0, and each successive entry is for +1 in ell.

beamerr
       -- fractional uncertainty in the power in each bin due to the 5
	  arcmin uncertainty in the beam measurement. See Wu et al 2001.
	  For each l bin, the columns are 
		<+1sig fractional err> <-1sig fractional err>

bin    -- the list of l bins used in calculating the bandpower

   Note that these files [bin and beam] are in the format required for
   the MADCAP software package. 

fisher_10
       -- the fisher (inverse correlation) matrix.
	  it is a 10x10 symmetric matrix stored "flattened" (column or
          row major).

	[ units are 1/uK^2 ]

	  See, e.g., BJK98

summary.dat
      -- information from Cl, xb and bin in a single file for ease of
         use.

xb     -- parameters needed for the offset lognormal ansatz for the
	  likelihood; see BJK00.
	  For each bin, the file gives x_bin in [ uK^2 ]

----

Uncertainties:

In addition to the error (actually, the ensemble-average curvature of
the likelihood function) given in the file Cl, there are additional
sources of uncertainty that must be factored into any further
processing of these data:

   There is an overall calibration uncertainty of 4% in Temperature
   (8% in power) in all bins.

   There is an uncertainty in the beam (see Wu et al 2000 for details)
   +-1sigma values given in the file beamerr, due primarily to the 5
   arcminute uncertainty in the size of the beam. This uncertainty
   acts like an additional (asymmetric) calibration uncertainty in
   each bin.

----

Note:

The data are given with many more significant figures than warranted
by the error bars. the extra digits are included to ensure that
round-off error is not important and for format reasons.

----

References:

http://cfpa.berkeley.edu/group/cmb/index.html

A.Balbi et al, ``Constraints on Cosmological Parameters from
Maxima-1'' Ap.J.Lett., to appear (astro-ph/0005124).

S.Hanany et al, ``Maxima-1: A Measurement of the Cosmic Microwave
Background Anisotropy on angular scales of 10 arcminutes to 5
degrees'' Ap.J.Lett., to appear. (astro-ph/0005123).

J.H.P. Wu et al, ``Asymmetric Beams in Cosmic Microwave Background Anisotropy
  Experiments'', Ap.J.Supp., to appear. (astro-ph/0007212).

[BJK98] J.R.Bond, A.H.Jaffe & L.Knox,``Estimating the Power Spectrum
of the Cosmic Microwave Background,'' Phys. Rev. D57, 2117,
1998. (astro-ph/9708203).

[BJK00] J.R.Bond, A.H.Jaffe & L.Knox, ``Radical Compression of Cosmic
Microwave Background Data,'' Astrophys. J., 533, 19-37, 2000.
(astro-ph/9808264)

[MADCAP] http://cfpa.berkeley.edu/~borrill/cmb/madcap.html