FIRS

Ganga et al. use data from the 170 GHz channel of the balloon-borne FIRS (Far Infrared Survey) experiment to constrain CMBR anisotropy.

The FWHM of the beam, assumed to be gaussian, is $\sigma_{\rm FWHM} = 3.8^\circ$. The zero-lag window function is

$$W_\ell = e^{-\sigma_{\rm G}{}^2 (\ell + 0.5)^2} , \eqno(1)$$

where $\sigma_{\rm G} = \sigma_{\rm FWHM}/\sqrt{8 {\rm ln} 2}$.

The first column in the window function file is $\ell$, which runs from 2 to 130. The second column is $W_\ell$.

Table: FIRS zero-lag Window Function Parameters

$\ell_{e^{-0.5}}$	$\ell_{\rm e}$	$\ell_{\rm m}$	$\ell_{e^{-0.5}}$	$\sqrt{I(W_\ell)}$
(2)	10.8	2	25	1.62

The quoted bandtemperature values are from Bond, with 7% added in quadrature to his statistical 1 $\sigma$ error bars to account for the FIRS 1 $\sigma$ calibration uncertainty.

Fig.: FIRS zero-lag window functions. (Postscript version here.)

REFERENCES

Link to the experiment webpage.

J.R. Bond, ``Signal-to-Noise Eigenmode Analysis of the Two-Year COBE Maps", Phys. Rev. Lett. 74, 4369 (1995).

K. Ganga, E. Cheng, S. Meyer, and L. Page, ``Cross-Correlation Between the 170 GHz Survey Map and the $COBE$ Differential Microwave Radiometer First-Year Maps", Astrophys. J. Lett. 410, L57 (1993).

K. Ganga, L. Page, E. Cheng, and S. Meyer, ``The Amplitude and Spectral Index of the Large Angular Scale Anisotropy in the Cosmic Microwave Background Radiation", Astrophys. J. Lett. 432, L15 (1994).