ball1.gif SuZIE

Church et al. (1997 [SuZIE94], in preparation [SuZIE98]) use 140 GHz data from the ground-based SuZIE (Sunyaev-Zel'dovich Infrared Experiment) experiment on Mauna Kea to constrain CMBR anisotropy. Ganga et al. (1997b) summarize the SuZIE94 experiment.

The FWHM of the beams, assumed to be gaussian, are $\sigma_{\rm FWHM} =
1.68^\prime$ (SuZIE94) and $1.4^\prime$ (SuZIE98). The zero-lag window function of the smooth-scan, two-beam experiment is

$\displaystyle W_\ell = e^{-\sigma_{\rm G}{}^2 (\ell + 0.5)^2}$ $\textstyle {}$ $\displaystyle \sum_{k=0}^\ell
{\Gamma (k + 0.5) \Gamma (\ell - k + 0.5) \over
...\left((\ell - 2k) \Delta\phi/2\right) \over
(\ell - 2k) \Delta\phi/2} \right]^2$  
  $\textstyle {}$ $\displaystyle      \times {4 \over \pi}
\left[ {\rm sin} \left( (\ell - 2k) \Phi_0 \right) \right]^2 ,$ (5)

where $\sigma_{\rm G} = \sigma_{\rm FWHM}/\sqrt{8 {\rm ln} 2}$, the bin size $\Delta\phi = 0.75^\prime$ (SuZIE94) and $0.5^\prime$ (SuZIE98), and $\Phi_0 = 2.38^\prime$ (SuZIE94) and $2.5^\prime$ (SuZIE98) is half of the peak-to-peak chop angle.

The first column in the window function file is $\ell$, which runs from 2 to 15000. The second and third columns are the SuZIE94 and SuZIE98 zero-lag $W_\ell$'s.

Table: SuZIE zero-lag Window Function Parameters
  $\ell_{e^{-0.5}}$ $\ell_{\rm e}$ $\ell_{\rm m}$ $\ell_{e^{-0.5}}$ $\sqrt{I(W_\ell)}$
SuZIE94 1327 2335.8 2398 3665 1.26
SuZIE98 1330 2544.4 2400 3676 1.85

The quoted bandtemperature values for SuZIE94 are from Ganga et al. (1997b). They were computed assuming a flat bandpower spectrum and, following Ganga et al. (1997a), account for the SuZIE absolute calibration uncertainty of 8%. The SuZIE98 results are preliminary and account for the calibration uncertainty by adding it in quadrature to the statistical 1 $\sigma$ error bars.

Ganga et al. (1997b) and Ratra et al. use the SuZIE94 data to constrain cosmological parameters.

Fig.: SuZIE zero-lag window functions. (Postscript version here.) win_SuZIE.gif


ball23.gifLink to the experiment webpage.

S.E. Church, K.M. Ganga, P.A.R. Ade, W.L. Holzapfel, P.D. Mauskopf, T.M. Wilbanks, and A.E. Lange, ``An Upper Limit to Arcminute-Scale Anisotropy in the Cosmic Microwave Background Radiation at 142 GHz", Astrophys. J. 484, 523 (1997).

K. Ganga, B. Ratra, S.E. Church, N. Sugiyama, P.A.R. Ade, W.L. Holzapfel, P.D. Mauskopf, and A.E. Lange, ``Using Sunyaev-Zeldovich Infrared Experiment (SuZIE) Arcminute-Scale Cosmic Microwave Background Anisotropy Data to Probe Open and Flat $\Lambda$ Cold Dark Matter Cosmogonies",Astrophys. J. 484, 517 (1997b).

K. Ganga, B. Ratra, J.O. Gundersen, and N. Sugiyama, ``UCSB South Pole 1994 Cosmic Microwave Background Anisotropy Measurement Constraints on Open and Flat-$\Lambda$ Cold Dark Matter Cosmogonies", Astrophys. J. 484, 7 (1997a).

B. Ratra, R. Stompor, K. Ganga, G. Rocha, N. Sugiyama, and K.M. Górski, ``Cosmic Microwave Background Anisotropy Constraints on Open and Flat-$\Lambda$ Cold Dark Matter Cosmogonies from UCSB South Pole, ARGO, MAX, White Dish, and SuZIE Data", Astrophys. J. 517, 549 (1999).

Bharat Ratra and Tarun Souradeep
Department of Physics, Kansas State University
Last updated: 2000-08-31