Complex Visibilities of Cosmic Microwave Background Anisotropies
نویسنده
چکیده
We study the complex visibilities of the cosmic microwave background anisotropies that are observables in interferometric observations of the cosmic microwave background, using the multipole expansion methods commonly adopted in analyzing single-dish experiments. This allows us to recover the properties of the visibilities that is obscured in the flat-sky approximation. Discussions of the window function, multipole resolution, instrumental noise, pixelization, and polarization are given. PACS number(s): 98.70.Vc, 98.80.Es Typeset using REVTEX Current address: Canadian Institute for Theoretical Astrophysics, 60 St. George St., Toronto, ON M5S 3H8, Canada. 1
منابع مشابه
Mosaicking with Cosmic Microwave Background Interferometers
Measurements of cosmic microwave background (CMB) anisotropies by interferometers offer several advantages over single-dish observations. The formalism for analyzing interferometer CMB data is well developed in the flat-sky approximation, which is valid for small fields of view. As the area of sky is increased to obtain finer spectral resolution, this approximation needs to be relaxed. We exten...
متن کاملAnalyzing data from DASI
We present an optimized layout of horn positions for the Degree Angular Scale Interferometer (DASI), which provides good coverage of the u-v plane and 3-fold symmetry. We investigate how an optimal subspace filtering analysis of a single pointing of DASI could be used to determine the anisotropies in the cosmic microwave background over a range of angular scales near 30. We discuss the compleme...
متن کاملRadio Interferometers with wide bandwidths
The Australia Telescope Compact Array and the Very Large Array are currently being upgraded to operate with wide bandwidths; interferometers dedicated to the measurement of cosmic microwave background anisotropies are being designed with large instantaneous bandwidths for high sensitivity. Interferometers with wide instantaneous bandwidths that do not operate with correlators capable of decompo...
متن کاملPhysics of Cosmic Microwave Background Anisotropies and Primordial Fluctuations
The physics of the origin and evolution of CMB anisotropies is described. I explain the idea and status of cosmic parameter estimation and follow it up with critical comments on its dependence on model assumptions and initial conditions. DURRER, Ruth. Physics of Cosmic Microwave Background anisotropies and primordial fluctuations. Space Science Reviews, 2002, vol. 100, no. 1-4, p. 3-14 DOI : 10...
متن کاملThe Imprint of Lithium Recombination on the Microwave Background Anisotropies
Following Loeb (2001), we explore the imprint of the resonant 6708Å line opacity of neutral lithium on the temperature and polarization anisotropies of the cosmic microwave background (CMB) at observed wavelengths of 250–350μm (0.9–1.2 THz). We show that if lithium recombines in the redshift range of z = 400–500 as expected, then the standard CMB anisotropies would be significantly modified in ...
متن کامل