Proceedings of the Particle Physics and Early Universe
Conference (PPEUC).
For this paper:
postscript
PPEUC CMB index
1 Introduction...
From simulated sky maps to simulated observations
C. Burigana,
D. Maino,
N. Mandolesi,
E.
Pierpaoli,
M. Bersanelli,
L. Danese,
and M.R. Attolini
Istituto TESRE, Consiglio Nazionale delle Ricerche, Via
Gobetti 101, 40129 Bologna, Italy
SISSA, International School for Advanced Studies, Via Beirut 2-4,
34014 Trieste, Italy
IFCTR, Consiglio Nazionale delle Ricerche, Via Bassini 15, 20133 Milano,
Italy
Abstract:
We present the basic issues of our simulation program, focusing on some
particular aspects. We have generated high resolution maps by using standard
spherical harmonics expansion for the CMB fluctuations and by extrapolating
available full sky maps to predict the Galaxy emission at frequencies and
angular scales appropriate to the PLANCK space mission. These maps have been
used to simulate the PLANCK observations and to test its performance. Beam
responses are typically not symmetric when they are coupled to a telescope to
reach high resolutions, whereas theoretical predictions and standard
deconvolution methods generally assume pure symmetric beams. We have simulated
PLANCK observations at 30 and 100 GHz for typical scan circles, by convolving
simulated maps of the microwave sky with asymmetric beams, to estimate the
effect of beam asymmetry on temperature fluctuations measurements. We find that
the typical difference between temperature measurements performed by symmetric
and asymmetric beams is of few 
, depending on the eccentricity of
the beam response shape and on the beam FWHM. Although this effect is not very
high, it may be appreciable and must be reduced by optimising the focal plane.
PPEUC Proceedings
Fri Jul 25 11:36:12 BST 1997