Methods for CMB map analysis

TL;DR

This paper provides a comprehensive guide for new researchers on best practices in cosmic microwave background (CMB) map analysis, covering procedures like masking, resolution adjustment, and noise addition, and their impact on power spectrum measurement.

Contribution

It offers detailed recommendations and insights on standard procedures in CMB map analysis, emphasizing correct implementation and potential pitfalls.

Findings

Best practices for masking and resolution downgrading

Effects of beam and pixel window functions on power spectrum

Impact of white noise addition on data analysis

Abstract

This introductory guide aims to provide insight to new researchers in the field of cosmic microwave background (CMB) map analysis on best practices for several common procedures. We will discuss common map-modifying procedures such as masking, downgrading resolution, the effect of the beam and the pixel window function, and adding white noise. We will explore how these modifications affect the final power spectrum measured from a map. This guide aims to describe the best way to perform each of these procedures, when the different steps and measures should be carried out, and the effects of incorrectly performing or applying any of them.