-
Adrien LA POSTA (Oxford University)19/12/2024 08:55
The Simons Observatory is an ensemble of telescopes being progressively deployed on Cerro Toco (Chile), aiming at measuring both small and large angular scales of the cosmic microwave background. Three Small Aperture Telescopes have been successfully installed on site and started operating from late 2023. These half-meter mirrors telescopes are designed to measure the large-scale polarization...
Go to contribution page -
Andrea Catalano (LPSC - Grenoble)19/12/2024 09:15
Over the past year, the proposal to build a high-frequency Small Aperture Telescope (SAT) to add to the Simons observatory has gradually become more and more consolidated. This project named Kairos is currently submitted for funding to the RI2 CNRS program (Recherche à risque et à impact) and has obtained the support of three institutes (IN2P3, INSU and INP). We propose to deploy a focal plane...
Go to contribution page -
Baptiste Jost (IPMU)19/12/2024 09:35
One of the main scientific goals of the Simons Observatory (SO) Small Aperture Telescopes (SATs) is to measure traces of inflation in the primordial B-modes in the CMB polarization. This signal is expected to be extremely faint. Its detection therefore depends on the removal of contaminating signals emitted by Galactic foregrounds and an exquisite control of systematic effects, such as the...
Go to contribution page -
Benjamin Beringue (APC, CNRS)19/12/2024 09:55
Rayleigh scattering of the Cosmic Microwave Background (CMB) is a less studied yet potentially powerful probe of the recombination history. Scattering of CMB photons off neutral species right after recombination presents a distinctive $\nu^4$ scaling with frequency as well as a strong correlation with the primary CMB. These unique features should facilitate its detection by the next generation...
Go to contribution page -
Simon Biquard (APC / CNRS)19/12/2024 10:15
The quest for primordial B-mode polarisation in the cosmic microwave background poses significant analysis challenges. Because the signal is so faint, robust measurements (or constraints) require a particular attention to systematic effects, astrophysical foregrounds, as well as the interplay between the two. This task is made even more difficult by the volume and complexity of the datasets...
Go to contribution page -
Magdy Morshed (INFN Ferrara)19/12/2024 11:10
Component separation is the crucial and challenging analysis step to estimate the CMB signal in the presence of astrophysical contaminants.
Go to contribution page
The Galactic dust and synchrotron are the primary millimeter emissions to remove in the search for primordial CMB B-modes.
One major unknown is the full complexity of the polarized astrophysical foreground spectral properties, which is yet to be assessed... -
Dr Alessia Ritacco (CNRS-LPSC)19/12/2024 11:30
In the context of future experiments measuring the polarization of the Cosmic Microwave Background (CMB), COSMOCal proposes a method independent of laboratory calibration of CMB instruments and cosmological model assumptions to calibrate next-generation millimeter-wave telescopes. The primary objective is to achieve polarization angle calibration with a precision better than 0.1 degrees. This...
Go to contribution page -
Sofia SAVORGNANO (LPSC Grenoble)19/12/2024 11:50
The ambitious quest to detect the faint B-modes of CMB polarization, pursued by projects like the Simons Observatory (SO) and LiteBIRD, requires rigorous control over systematic effects in polarimetry. The PolarKID project, supported by CNES (2023–2025), is dedicated to testing LEKIDs in a filled array configuration to demonstrate their capability for precise polarization detection. This setup...
Go to contribution page -
Apolline CHAPPARD (Ias)19/12/2024 12:10
The QUIJOTE MFI instrument (2012-2018) observed the sky at four
Go to contribution page
frequency bands, 11, 13, 17, and 19 GHz, at 1 degree angular resolution.
For ground-based Cosmic Microwave Background experiments like QUIJOTE,
the atmosphere is a major source of contamination in the data. Using the
entire database of MFI wide-survey observations (2013-2018), we
characterized the correlation properties of...
Choisissez le fuseau horaire
Le fuseau horaire de votre profil: