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CMB lensing → mass maps Three maps of the sky. The Milky way forms an upside U shape at center. The Planck map shows a blue and green pattern over the whole sky, except the Mily Way. ACT DR6 shows a pink pattern, filling in most of the area under the U and a few patched on the sides. SPT-3G 2-year Polarization Only! shoes a small arc in the the bottom of the map. Plot shows Lensing Power Spectrum (~400 by each experiment). It forms an arc, with a peak at and L of 2x10^2. Data from Planck PR4, ACT DR6 SPT-3G 2yr-main.

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CMB lensing → mass maps Three maps of the sky. The Milky way forms an upside U shape at center. The Planck map shows a blue and green pattern over the whole sky, except the Mily Way. ACT DR6 shows a pink pattern, filling in most of the area under the U and a few patched on the sides. SPT-3G 2-year Polarization Only! shoes a small arc in the the bottom of the map. Plot shows Lensing Power Spectrum (~400 by each experiment). It forms an arc, with a peak at and L of 2x10^2. Data from Planck PR4, ACT DR6 SPT-3G 2yr-main.
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Kelly Lepo (kellylepo@astrodon.social)'s status on Tuesday, 21-Jan-2025 01:35:01 JST Kelly Lepo
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Plank covered the entire sky, but due to its smaller mirror, it has lower resolution.
Since they get 24 hours of darkness in the winter, SPT can take very deep images, but they only have access to the circumpolar sky.
In Chile, you can’t image as deeply, but you get access to more of the sky. So South Pole and Chilean telescopes complement each other.
Polarization measurements from SPT-3G are an independent way to determine the Hubble constant. It agrees with Plank measurements and disagrees with the local Universe measurements. The Hubble tension remains.

In conversation about 18 days ago from astrodon.social permalink