Asymmetry of the PLANCK antenna beam shape and its manifestation in the CMB data
نویسنده
چکیده
We present a new method to extract the beam shape incorporated in the pixelized map of CMB experiments. This method is based on the interplay of the amplitudes and phases of the signal and instrumental noise. By adding controlled white noise onto the map, the phases are perturbed in such a way that the beam shape manifests itself through the mean-squared value of the difference between original and perturbed phases. This method is useful in extracting preliminary antenna beam shape without time-consuming spherical harmonic computations.
منابع مشابه
On the linear filters for point source extraction of the Planck mission
The manifestation of point sources in the upcoming Planck maps is a direct reflection of the properties of the pixelized antenna beam shape for each frequency, which is related to the scan strategy, pointing accuracy, noise properties and map-making algorithm. In this paper we firstly compare analytically the three filters for the Planck point source extraction, namely, the adaptive top-hat fil...
متن کاملModified Rectangular Patch Antenna Loaded With Multiple C Slots for Multiple Applications
A new multiple C-slotted microstrip patch antenna is proposed in the present study. A patch antenna is a wide-beam narrowband antenna. The microstrip patch antenna consists of a very thin metallic strip (patch) placed a small fraction of a wavelength above a ground plane. The patch can be designed in any possible shape and normally made of conducting materials such as copper or gold. This study...
متن کاملPlanck LFI : Comparison Between Galaxy Straylight Contamination and other Systematic Effects
The straylight contamination due to the Galactic emission (GSC, Galaxy Straylight Contamination) entering at large angles from the antenna centre direction may be one of the most critical sources of systematic effects in observations of the cosmic microwave background (CMB) anisotropies by future satellite missions like Planck and MAP. For the Low Frequency Instrument (LFI), this effect is expe...
متن کاملNon-circular rotating beams and CMB experiments
This paper is concerned with small angular scale experiments for the observation of cosmic microwave background anisotropies. In the absence of beam, the effects of partial coverage and pixelisation are disentangled and analyzed (using simulations). Then, appropriate maps involving the CMB signal plus the synchrotron and dust emissions from the Milky Way are simulated, and an asymmetric beam –w...
متن کاملPlanar Antenna-Coupled Bolometers for CMB Polarimetry
Antenna-coupled detectors provide all the functions required of a CMB polarimeter, including beam formation, spectral band definition, and polarization analysis. Planar antennas are fully lithographed devices that do not require coupling optics, and thus readily scale to the production of large focal plane arrays. Antennas coupled to direct detectors such as transitionedge bolometers can realiz...
متن کامل