Name | Last modified | Size | Description | |
---|---|---|---|---|

Parent Directory | - | |||

Cl | 10-Dec-2000 21:06 | 240 | ||

FILES | 08-Dec-2000 10:55 | 1.1K | ||

MAXIMA-1.tar | 10-Dec-2000 21:07 | 50K | ||

beam | 08-Dec-2000 10:55 | 33K | ||

beamerr | 08-Dec-2000 10:55 | 330 | ||

bin | 08-Dec-2000 10:55 | 100 | ||

fisher_10 | 08-Dec-2000 10:55 | 1.7K | ||

summary.dat | 08-Dec-2000 10:55 | 516 | ||

xb | 08-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