This page provides access to the data products associated with Zebrowski et al. Constraints on Inflationary Gravitational Waves with Two Years of SPT-3G Data.

If you have any questions regarding this data set or its use, please contact Jessica Avva Zebrowski (j.z [at] uchicago.edu) and/or Christian Reichardt (christian.reichardt [at] unimelb.edu.au)

Bandpowers and an implementation of the SPT-3G B-mode likelihood is available for download:

• Likelihood Code
• Bandpowers -- SPT-3G Data with the B18 Mask
• Bandpowers -- SPT-3G Full Field

E-mode and B-mode maps for the 1500 deg² SPT-3G field. A bandpass filter over ℓ = 30–150 has been applied to visually highlight the large angular scales where the inflationary signal peaks. Elevated levels of foreground emission can be seen on the right side of the map, especially at 220 GHz.

SPT-3G B-mode bandpowers for the BK18 mask for (top row) 95 × 95 GHz, 95 × 150 GHz, 150 × 150 GHz; (bottom row) 95 × 220 GHz, 150 × 220 GHz, and 220 × 220 GHz. The bandpowers with their 1σ error bars, calculated from the covariance matrix, are shown in red. The black line shows the best-fit model from Section VII. Colored lines show the best-fit model components individually (lensed ΛCDM, dust, synchrotron, and residuals).

Comparison of the SPT-3G B-mode power spectrum (red) with previous measurements from BICEP/Keck, Polarbear, ACTpol, and SPTpol. The solid black curve shows the expected lensing B-mode signal from ΛCDM. This figure highlights the consistency of the SPT-3G measurement with other experiments and its constraining power over a broad range of angular scales.