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CLASS Data Products

2021-2024 CLASS 90 GHz Power Spectra ▼

DOI: 10.71662/9h5m-1369 DOI Info Link
CLASS Collaboration (2025). CLASS 90 GHz 2021-2024 Power Spectra, Version 1.0, NASA LAMBDA [DOI: 10.71662/9h5m-1369] Local URL: https://lambda.gsfc.nasa.gov/product/class/class_90ghz_ee_spectra_2025_doi.html
Product Download Page	Description	No. of Files/Size
EE Spectra	Unbinned EE spectrum for 2 ≤ ℓ ≤ 30 and binned EE spectrum for 31 ≤ ℓ < 301. The binned EE spectrum is available using two different bin widths: Δℓ=10 and Δℓ=18. More...	3 files/ <2 KB each

2016-2022 CLASS 40 GHz Products (DR1) ▼

DOI: 10.71662/80wa-m931 DOI Info Link
CLASS Collaboration (2024). 2016-2022 CLASS 40 GHz Products (DR1), Version 1.0, NASA LAMBDA [DOI: 10.71662/80wa-m931] Local URL: https://lambda.gsfc.nasa.gov/product/class/class_dr1_prod_2022_doi.html
Product Download Page	Description	No. of Files/Size
Polarization Maps	Stokes Q, U and V maps, including full survey and data splits. More...	3 files, 6.8 MB each
Mapping Transfer Function	Mapping transfer function in the harmonic domain. More...	2 Files, 11 MB each
Beam Information	Beam profile and transfer function. More...	2 Files, 13.6 KB
Bandpass	Adopted 40 GHz bandpass for the 2016 - 2022 observations. More...	1 File, 4.4 KB
Noise Simulations	Simulations of instrument and mapping noise for statistical tests. More...	3 files, 308 MB each
Masks	Polarization sky masks used for analysis. More...	3 files <= 16 MB
Polarized Synchrotron Spectral Index	Polarized synchrotron spectral index (β_s) map made by analyzing the CLASS 40 GHz data with the lower frequency WMAP K-band data. More...	2 files, 200 KB each
Reobserved Maps of External Data	WMAP and Planck data that have been processed through the CLASS mapping pipeline for use in combination with the 40 GHz maps. More...	4 files, 2.4 MB each
Combined products	Combined CLASS 40 and WMAP Q-band Stokes Q, U maps, along with combined noise simulations and related products. More...	4 files, < 1GB

2016-2018 Circular Polarization ▼

DOI: 10.71662/yxe1-2r86 DOI Info Link
CLASS Collaboration (2020). Circular Polarization, Version 1.0, NASA LAMBDA [DOI: 10.71662/yxe1-2r86] Local URL: https://lambda.gsfc.nasa.gov/product/class/class_dr1_prod_2018_doi.html
Product Download Page	Description	No. of Files/Size
Circular polarization	The provided product is a single file containing four columns. More...	1 file 306 bytes

Software ▼

Product Download Page	Description	No. of Files/Size
Color Correction and Unit Conversion notebook	Jupyter notebook describing CLASS implementation of conversion from thermodynamic temperature to antenna temperature, including terms for color correction of a power-law SED and thermodynamic to Rayleigh-Jeans unit conversion. More...	1 file 1.2 MB
Polarized millimeter-wave atmospheric emission model	Code that simulates millimeter-wave atmospheric emission, including polarization. More...	1 file 935 KB
ClEE_Fast	Code that allows for quick interpolation between Cosmic Microwave Background polarized power spectra as a function of scalar fluctuations, tensor fluctuations, and the optical depth to reionization. More...	1 file 57.4 MB

A service of the HEASARC and of the Astrophysics Science Division at NASA/GSFC

HEASARC Director: Dr. Andrew F. Ptak

LAMBDA Director: Dr. Thomas M. Essinger-Hileman

NASA Official: Dr. Thomas M. Essinger-Hileman

Web Curator: Mr. Michael R. Greason

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