JWST NIRCam survey of 11 globular clusters detects multiple populations in low-mass stars, showing discrete sequences in some clusters and continuous distributions or helium/oxygen variations in others, plus an M-dwarf gap in NGC 104.
Discovery of Face-On Counterparts of Chain Galaxies in the Tadpole ACS Field
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abstract
The background field of the Tadpole galaxy image taken with the Hubble Space Telescope ACS contains 87 clump-clusters that are probably low-inclination versions of the 69 chain galaxies we found in a previous paper. This conclusion follows from the similarity in colors and apparent magnitudes of the brightest clumps in the clump-clusters and chain galaxies, and from the similarity between the distribution of axial ratios for the combined sample and the distribution for normal disk galaxies. These distributions are consistent with chains and clump-clusters being disks viewed at random angles with intrinsic axial ratios of 0.1-0.2 or less. The disks appear to be gas-rich galaxies at z=1 to 2 that are forming an early generation of stars in a small number of very large star complexes.
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Globular Clusters in the Time of the JWST. I. Survey Design and First Results on Multiple Populations and Beyond
JWST NIRCam survey of 11 globular clusters detects multiple populations in low-mass stars, showing discrete sequences in some clusters and continuous distributions or helium/oxygen variations in others, plus an M-dwarf gap in NGC 104.