WMAP represents one of the key full-sky CMB experiment data sets that led to the current highly successful cosmological standard model. Although having lower angular resolution and sensitivity than Planck, its frequency coverage and scanning strategy are highly complementary to Planck, and it provides vital information for Cosmoglobe.
The low-frequency foreground sky comprise a complicated mixture of synchrotron, AME, and free-free emission that requires a long frequency lever arm to resolve robustly. Observing half of the sky at a frequency of 1.4 GHz and an angular resolution of 14 arcmin, the CHIPASS data set offers a unique window on synchrotron emission. These data have been made available to the Cosmoglobe project, and is currently in the process of being integrated.
Upcoming: Planck HFI
Planck HFI represents the state-of-the-art in full-sky sensitivity, angular resolution and systematic error control, covering six frequency bands from 100 to 857 GHz. Integrating this landmark dataset into the Cosmoglobe model ranks among the most important goals of next-generation Cosmoglobe processing.
Cosmological parameter sampling
This project aims to implement joint power spectrum and cosmological parameter sampling in Commander3 without likelihood approximations, by interfacing Commander directly with the CAMB Boltzmann code. The main goal is cosmological parameter estimation with full end-to-end error propagation, which will be essential for next-generation B-mode experiments such as LiteBIRD.
DIRBE was one of the three instruments which flew on the famous COBE satellite, giving a comprehensive view of the full sky between 1 and 240 µm. DIRBE gives us a complete view of Zodiacal emission, as well as the Wien tail of the Galactic thermal dust emission, at angular scales. The addition of DIRBE into the Cosmoglobe framework will help constrain both of these foreground contaminants.
Constrained realizations with Commander
Many CMB analyses benefits greatly from full-sky coverage, for instance studies of statistical isotropy. Commander provides a convenient interface to generating constrained realizations that fills in a confidence mask with Gaussian fluctuations that have phases consistent with the unmasked sky and a user-specified power spectrum.
Zodiacal emission is thermal radiation from dust particles inside the Solar System, and is important at high CMB frequencies. The most widely used model for this was derived from COBE-DIRBE data by Kelsall et al. (1998). This project aims to derive a new state-of-the-art zodi model through joint analysis of DIRBE, Planck HFI, and other modern datasets. As a first milestone, we have published Zodipy, a modern Python interface to the Kelsall et al. model.