Colloque national CMB-France #7

Session

Ground-based observatories

13 oct. 2025, 14:00

Institut Astrophysique de Paris

9. The Atacama Cosmology Telescope sixth data release: ACT DR6

Adrien LA POSTA (Oxford University)

13/10/2025 14:00

In March 2025, the Atacama Cosmology Telescope (ACT) collaboration released its last cosmological analysis along with a new cosmic microwave background (CMB) dataset. The sixth data release (DR6), including data collected from 2017 to 2022, covers 40% of the sky at arcminute resolution providing precise maps of CMB temperature and polarization. In this talk, I will give an overview of the...

3. ACT-DR6 Power Spectrum Foreground Model and Validation on non Gaussian simulations

Dr Benjamin Beringue (APC, CNRS)

13/10/2025 14:20

The Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) delivers some of the most precise small-scale measurements of the cosmic microwave background, requiring accurate treatment of astrophysical foregrounds at millimeter wavelengths. In this talk, we will present the DR6 parametric foreground model, which accounts for Galactic dust, extragalactic sources, and secondary CMB anisotropies....

11. SPT-3G D1: CMB Temperature and Polarization Power Spectra and Cosmology from 2019–2020 Observations of the SPT-3G Main Field (1)

Etienne Camphuis (Institut d'Astrophysique de Paris)

13/10/2025 14:40

I will present measurements of the temperature and E-mode polarization angular power spectra of the cosmic microwave background (CMB) from observations covering 4% of the sky with SPT-3G, the current camera on the South Pole Telescope. These maps are the deepest ever used in a CMB TT/TE/EE analysis. Both the maps and resulting power spectra have been rigorously validated through blind and...

16. SPT-3G D1: CMB Temperature and Polarization Power Spectra and Cosmology from 2019–2020 Observations of the SPT-3G Main Field (2)

Ali Rida Khalife (IAP-CNRS and Sorbonne University)

13/10/2025 15:00

In the second part of this talk, I will first briefly present the lensing bandpowers used in this analysis. These are lensing data inferred from the E-mode polarization maps using the Marginal Unbiased Score Estimator (MUSE), and they are the most precise to date at $L > 350$. Second, I will present constraints on $\Lambda$CDM and a few of its extensions with CMB data, highlighting the...

12. SPT-3G D1: CMB Temperature and Polarization Power Spectra and Cosmology from 2019–2020 Observations of the SPT-3G Main Field (3)

Lennart Balkenhol (Institut d'Astrophysique de Paris)

13/10/2025 15:20

In the final part of this series of presentations, I will present cosmological implications from the cosmic microwave background (CMB) temperature and E-mode polarization power spectrum measurements previously introduced based on SPT-3G data. My presentation will cover the comparison and combination of the SPT data, as well as other contemporary CMB data sets, with state-of-the-art baryon...

4. QUBIC: taking advantage of Bolometric Interferometry with Spectral Imaging and news from the instrument

Alexandre Huchet (APC)

13/10/2025 15:40

QUBIC, the Q-U Bolometric Interferometer for Cosmology, is a telescope that observes the polarisation of the sky in the millimetre-wavelength range. Its goal is to detect the primordial B-modes of polarisation in the CMB by combining the sensitivity of bolometers with the good understanding of interferometry systematics. This dual aspect of QUBIC allows it to perform spectral imaging, that is,...