scholarly journals The MAP Satellite Mission to Map the CMB Anisotropy

2005 ◽  
Vol 201 ◽  
pp. 75-85
Author(s):  
Lyman. Page
Keyword(s):  
Cosmic Microwave Background ◽  
Design Principle ◽  
Instrument Design ◽  
Deep Space ◽  
Microwave Background ◽  
Satellite Mission ◽  
Mapping Strategy ◽  
Systematic Effects ◽  
Error Bars

The Microwave Anisotropy Probe (MAP) satellite is scheduled to launch in mid-2001. MAP's goal is to produce a map of the anisotropy in the cosmic microwave background of unprecedented accuracy and precision. The guiding design principle has been the minimization of systematic effects. The instrument design and mapping strategy work in concert to take advantage of the unique opportunities afforded by deep space. We give an overview of the mission and compare the projected MAP error bars to recent measurements.

scholarly journals AMIBA: FIRST-YEAR RESULTS FOR SUNYAEV-ZEL'DOVICH EFFECT

2008 ◽  
Vol 23 (17n20) ◽  
pp. 1675-1686 ◽  
Author(s):  
JIUN-HUEI PROTY WU ◽  
TZI-HONG CHIUEH ◽  
CHI-WEI HUANG ◽  
YAO-WEI LIAO ◽  
FU-CHENG WANG ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Galaxy Clusters ◽  
First Year ◽  
Microwave Background ◽  
Expansion Plan ◽  
Sunyaev Zel'dovich Effect ◽  
Systematic Effects ◽  
Science Operation

We discuss the observation, analysis, and results of the first-year science operation of AMiBA, an interferometric experiment designed to study cosmology via the measurement of Cosmic Microwave Background (CMB). In 2007, we successfully observed 6 galaxy clusters (z < 0.33) through the Sunyaev-Zel'dovich effect. AMiBA is the first CMB interferometer operating at 86–102 GHz, currently with 7 close-packed antennas of 60 cm in diameter giving a synthesized resolution of around 6 arcminutes. An observing strategy with on-off-source modulation is used to remove the effects from electronic offset and ground pickup. Formalism of the analysis is given and preliminary science results are summarized. Tests for systematic effects are also addressed. We also discuss the expansion plan.

scholarly journals Status of the GroundBIRD Telescope

2018 ◽  
Vol 168 ◽  
pp. 01014
Author(s):  
J. Choi ◽  
R. Génova-Santos ◽  
M. Hattori ◽  
M. Hazumi ◽  
H. Ishitsuka ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Early Universe ◽  
Present Status ◽  
Big Bang ◽  
Inflationary Cosmology ◽  
Polarization Pattern ◽  
Microwave Background ◽  
Systematic Effects ◽  
The Big Bang

Our understanding of physics at very early Universe, as early as 10−35 s after the Big Bang, relies on the scenario known as the inflationary cosmology. Inflation predicts a particular polarization pattern in the cosmic microwave background, known as the B-mode yet the strength of such polarization pattern is extremely weak. To search for the B-mode of the polarization in the cosmic microwave background, we are constructing an off-axis rotating telescope to mitigate systematic effects as well as to maximize the sky coverage of the observation. We will discuss the present status of the GroundBIRD telescope.

NEW CONSTRAINTS ON FEATURES IN THE PRIMORDIAL SPECTRUM

2013 ◽  
Vol 23 ◽  
pp. 345-349
Author(s):  
MICOL BENETTI
Keyword(s):  
Cosmic Microwave Background ◽  
Small Amplitude ◽  
Current Data ◽  
Microwave Background ◽  
Polarization Data ◽  
Satellite Mission ◽  
The One ◽  
Planck Satellite

We study a particular inflation models with a small-amplitude step-like feature in the inflaton potential as introducted by Adams et al. and we constraints it with data from the WMAP7 and ACT Cosmic Microwave Background experiments. Also we show that the possibility of a step in the inflationary potential like the one preferred by current data will soon be tested by the forthcoming temperature and polarization data from the Planck satellite mission.

Polarization of extragalactic radio sources: CMB foregrounds and telescope calibration issues

2016 ◽  
Vol 25 (11) ◽  
pp. 1640009 ◽  
Author(s):  
Marcella Massardi ◽  
Vincenzo Galluzzi ◽  
Rosita Paladino ◽  
Carlo Burigana
Keyword(s):  
Cosmic Microwave Background ◽  
Radio Source ◽  
High Redshift ◽  
The Other ◽  
Radio Sources ◽  
Polarization Rotation ◽  
Microwave Background ◽  
Extragalactic Radio Sources ◽  
Systematic Effects ◽  
The One

Radio source observations play important roles in polarimetric cosmological studies. On the one hand, they constitute the main foregrounds for cosmic microwave background (CMB) radiation on scales smaller than 30 arcmin up to 100 GHz, on the other they can be used as targets for validation of products of polarimetric experiments dedicated to cosmology. Furthermore, extragalactic high-redshift sources have been used for cosmic polarization rotation (CPR) investigation. In this paper, we will discuss the support to cosmological studies from ground-based polarimetric observations in the radio and millimetric wavelength bands. Most of the limits to accuracy improvements arise from systematic effects and low calibration quality. We will discuss some details of interferometric calibration procedures and show some of the perspectives that the Atacama large millimeter array (ALMA) could offer for CPR studies.

scholarly journals Microwave Background interferometry in Cambridge

1991 ◽  
Vol 131 ◽  
pp. 395-399
Author(s):  
Michael E. Jones
Keyword(s):  
High Temperature ◽  
Cosmic Microwave Background ◽  
Temperature Sensitivity ◽  
Filling Factor ◽  
Integration Time ◽  
Microwave Background ◽  
New Instrument ◽  
Sunyaev Zel'dovich Effect ◽  
Systematic Effects ◽  
High Temperature Sensitivity

AbstractInterferometric methods of studying the Cosmic Microwave Background (CMB) have some distinct advantages over the switched-beam techniques which have mostly been used. However, most existing interferometers are not well suited to CMB observations, for a variety of reasons. These include poor temperature sensitivity due to a low filling factor, and systematic effects which limit the maximum possible integration time. A new instrument, the Ryle Telescope, has been developed in Cambridge which has a high temperature sensitivity (120 μK in 12 h) and the ability to integrate for several hundred hours on the same field. It will be used to study the CMB on angular scales of a few arcminutes, with particular emphasis on the Sunyaev-Zel’dovich effect. A second instrument to study the CMB on angular scales of tens of arcminutes, the Cosmic Anisotropy Telescope (CAT), is also being developed.

scholarly journals SYSTEMATIC EFFECTS IN INTERFEROMETRIC OBSERVATIONS OF THE COSMIC MICROWAVE BACKGROUND POLARIZATION

2013 ◽  
Vol 207 (1) ◽  
pp. 14 ◽  
Author(s):  
Ata Karakci ◽  
Le Zhang ◽  
P. M. Sutter ◽  
Emory F. Bunn ◽  
Andrei Korotkov ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Microwave Background ◽  
Cosmic Microwave Background Polarization ◽  
Systematic Effects

scholarly journals Systematic effects induced by half-wave plate precession into measurements of the cosmic microwave background polarization

2019 ◽  
Vol 627 ◽  
pp. A160 ◽  
Author(s):  
G. D’Alessandro ◽  
L. Mele ◽  
F. Columbro ◽  
L. Pagano ◽  
F. Piacentini ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Numerical Simulations ◽  
Analytical Formula ◽  
Stokes Parameters ◽  
Observational Cosmology ◽  
Microwave Background ◽  
Half Wave Plate ◽  
Wave Plate ◽  
Half Wave ◽  
Systematic Effects

Context. The primordial B-mode signal in the cosmic microwave background (CMB) represents the smoking gun of cosmic inflation, and measuring it is the main goal of current experimental effort. The most accessible method for measuring polarization features of the CMB radiation is a Stokes polarimeter based on the rotation of a half-wave plate (HWP). Aims. Current observational cosmology is starting to be limited by systematic effects. A Stokes polarimeter with a rotating HWP has the advantage of mitigating a long list of potential systematics by modulating the linearly polarized component of the radiation, but the rotating HWP itself may introduce new systematic effects that must be under control. This represents one of the most critical parts in the design of a B-mode experiment. It is therefore mandatory to take all the systematic effects into account that the instrumentation can induce. We here present, simulate, and analyze the spurious signal arising from the precession of a rotating HWP. Methods. We first derived an analytical formula to describe the systematic effect that is induced by the HWP precession on the propagating radiation, using the 3D generalization of the Müller formalism. We then performed several numerical simulations that show the effect induced on the Stokes parameters by this systematic. We also derived and discuss the effect on B-modes as measured by a satellite experiment. Results. We derive the analytical formula for the Stokes parameters from a Stokes polarimeter where the HWP follows a precessional motion with an angle θ0. We show the result depending on the HWP inertia tensor, spinning speed, and on θ0. The result of numerical simulations is reported as a simple time-line of the electric fields. Finally, assuming that the entire sky is observed with a satellite mission, we analyze the effect on B-mode measurements. Conclusions. The effect is not negligible at the sensitivity of current B-mode experiments, therefore this systematic needs to be carefully considered for future experiments.

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