A unified pseudo-Cℓ framework

By D. Alonso, Javier Sanchez, A. Slosar. Monthly notices of the Royal Astronomical Society, 2018

274 citations recorded by the source corpus.

The pseudo-Cl is an algorithm for estimating the angular power and cross-power spectra that is very fast and in realistic cases also nearly optimal. The algorithm can be extended to deal with contaminant deprojection and E/B purification, and can therefore be applied in a wide variety of scenarios of interest for current and future cosmological observations. This paper presents NaMaster, a public, validated, accurate and easy-to-use software package that, for the first time, provides a unified framework to compute angular cross-power spectra of any pair of spin-0 or spin-2 fields, contaminated by an arbitrary number of linear systematics and requiring B- or E-mode purification, both on the sphere or in the flat-sky approximation. We describe the mathematical background of the estimator, including all the features above, and its software implementation in NaMaster. We construct a validation suite that aims to resemble the types of observations that next-generation large-scale structure and ground-based CMB experiments will face, and use it to show that the code is able to recover the input power spectra in the most complex scenarios with no detectable bias. NaMaster can be found at https://github.com/LSSTDESC/NaMaster, and is provided with comprehensive documentation and a number of code examples.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8586742d7a4af7c029a411dbfe9ee1145940433d

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. David N. Spergel
2. Mark Halpern
3. J. Dunkley
4. Edward J. Wollack
5. L. Page
6. M. Nolta
7. M. Limon
8. E. Komatsu

In Nuclear and High Energy Physics

1. David N. Spergel
2. Mark Halpern
3. Edward J. Wollack
4. M. Nolta
5. M. Limon
6. L. Page
7. J. Dunkley
8. R. Bean

Citations in the corpus

• The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters (2023, methodology): “An approximate way to account for this is to use the square of the analysis mask in software like NaMaster (Alonso et al. 2019) that implement the MASTER algorithm.”