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Space - Ground All sky from space compared to targeted fields and high resolution from the ground Two images. On the left is Space (Planck), a series of black and white blobs. On the right is SPT, a slightly higher-res set of blobs with a few small black and white dots. A white dot is circled. An insert shows HSt/WFC3 image of a fuzzy dark point with a red contor firing a ring around it from ALMA. It is labeled AGN & high z dusty star forming galaxies.

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Space - Ground All sky from space compared to targeted fields and high resolution from the ground Two images. On the left is Space (Planck), a series of black and white blobs. On the right is SPT, a slightly higher-res set of blobs with a few small black and white dots. A white dot is circled. An insert shows HSt/WFC3 image of a fuzzy dark point with a red contor firing a ring around it from ALMA. It is labeled AGN & high z dusty star forming galaxies.
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Kelly Lepo (kellylepo@astrodon.social)'s status on Tuesday, 21-Jan-2025 01:35:02 JST Kelly Lepo
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Looking at the SPT data, we see point sources. This is washed out in the lower-resolution space-based Plank data.
Most of these points are quasars and are in known catalogs. However, there were some bright, dusty sources found with SPT that were not in any catalogs.
Follow-up observations with ALMA show these to be distant galaxies lens by a foreground galaxy into ring shapes. Spectra of the galaxies gives you a redshift from the CO line.

In conversation about 18 days ago from astrodon.social permalink