Deep CosmoStat Days

Session

Radio Astronomy

13 févr. 2026, 11:30

Cassini (CEA/DAp)

6. Foreground removal in HI 21 cm intensity mapping under frequency-dependent beam distortions

Athanasia Gkogkou (IA/ICS-FORTH)

13/02/2026 11:30

Neutral hydrogen (HI) intensity mapping with single-dish telescopes is a powerful probe of post-reionization cosmology, but extracting the signal is challenging due to bright foregrounds and realistic, frequency-dependent beam effects that degrade most standard methods. I present an evaluation of SDecGMCA, a spherical extension of GMCA that combines sparse component separation with explicit...

12. Generative model for shear inference in the context of radio weak gravitational lensing

Ezequiel Centofanti (CosmoStat, CEA Paris-Saclay)

13/02/2026 11:50

Next-generation radio interferometers, such as the SKA, will observe the radio sky with unprecedented sensitivity and resolution. Their wide sky coverage will also enable weak lensing studies using radio data. Radio weak lensing not only complements optical observations, but also allows access to higher redshifts. However, traditional shear estimation methods—based on measuring the ellipticity...

8. Starlet l1-norm for neutral hydrogen intensity mapping

Pauline Gorbatchev (FORTH)

13/02/2026 12:10

Neutral hydrogen intensity mapping encodes valuable non-Gaussian cosmological information, particularly at late times in the Universe’s evolution. Traditional two-point statistics, such as the angular power spectrum, are not sensitive to this information. In this work, we employ the starlet l1-norm, a multi-scale, higher-order statistic robust to instrumental effects to capture non-Gaussian...