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ALMA Cycle 0 A 4x4 grid showing a series of black and white images with ring shapes. A color image of a orange ring shape on a black background. Label: SPT0418-47 @ z = 4.2, JWST/NIRCam Observations, ALMA [CII] contours, JWST TEMPLATES PI: Jane Rigby Chart showing the spectra of the galaxies in the image grid. Spectroscopic redshift survey 5 tunings in the 3 mm band (100 GHz). Lines of CO are marked and they are arranged by redshift from z=2.0 to z=5.7.

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ALMA Cycle 0 A 4x4 grid showing a series of black and white images with ring shapes. A color image of a orange ring shape on a black background. Label: SPT0418-47 @ z = 4.2, JWST/NIRCam Observations, ALMA [CII] contours, JWST TEMPLATES PI: Jane Rigby Chart showing the spectra of the galaxies in the image grid. Spectroscopic redshift survey 5 tunings in the 3 mm band (100 GHz). Lines of CO are marked and they are arranged by redshift from z=2.0 to z=5.7.
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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 4 months ago from astrodon.social permalink