Madam- a map-making method for CMB experiments
نویسندگان
چکیده
منابع مشابه
Madam - a map-making method for CMB experiments
We present a new map-making method for CMB measurements. The method is based on the destriping technique, but it also utilizes information about the noise spectrum. The low-frequency component of the instrument noise stream is modelled as a superposition of a set of simple base functions, whose amplitudes are determined by means of maximum-likelihood analysis, involving the covariance matrix of...
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A major goal of CMB experiments is to obtain highly sensitive CMB maps in order to extract Spherical Harmonic Power Spectrum (SHPS) and cosmological parameters with unprecedented accuracy. We present a new map-making code (Mirage), based on a two-phase iterative algorithm, involving low frequency drift treatment, Butterworth high-pass filtering and conjugate gradient method. This work was stron...
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We have compared cosmic microwave background (CMB) maps made from one-year time ordered data (TOD) streams that simulated observations of the originally planned 100 GHz P Low Frequency Instrument (LFI). The maps were made with the ROMA, MapCUMBA and destriping algorithms. We produced angular power spectrum estimates from the ROMA and destriping maps and compared them as well. ROMA and MapC...
متن کاملMaking CMB temperature and polarization maps with Madam
MADAM is a CMB map-making code, designed to make temperature and polarization maps of time-ordered data of total power experiments like Planck. The algorithm is based on the destriping technique, but it also makes use of known noise properties in the form of a noise prior. The method in its early form was presented in an earlier work by Keihänen et al. (2005). In this paper we present an update...
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Map-making presents a significant computational challenge to the next generation of kilopixel CMB polarisation experiments. Years worth of time ordered data (TOD) from thousands of detectors will need to be compressed into maps of the T, Q and U Stokes parameters. Fundamental to the science goal of these experiments, the observation of B-modes, is the ability to control noise and systematics. F...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2005
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2005.09055.x