The James Webb is Measuring Distant Galaxies 5-10 Times Better Than any Other Telescope universetoday storybywill
As they indicate in their study, stellar mass is one of the most important physical properties for understanding galaxy formation and evolution. It measures the total amount of stars in a galaxy, which are constantly being added through the conversion of gas and dust into new stars. Therefore, it is the most direct means of tracing a galaxy’s growth. By comparing observations of the oldest galaxies in the Universe , astronomers can study how galaxies evolved.
“The bulk of the stars in galaxies, those that mostly contribute to its stellar mass, emit at optical-near infrared wavelengths… [B]y the time the light takes to travels from a distant galaxy to our telescopes, the light emitted by its stars is no more in the optical regime. E.g., for a z=7 galaxy, the light originally emitted at 0.6 micron, reaches our telescope with a wavelength of 4.8 micron. The higher the redshift , the stronger is this effect.
Moreover, previous surveys were likely to miss a large fraction of intrinsically red galaxies that are dust-rich and faint in the UV spectrum. Consequently, previous estimates of the cosmic star stellar mass density of the early Universe could be off by a factor of up to six. But thanks to its advanced suite of infrared instruments and unparalleled sensitivity, the JWST is poised to open “a new window” into studying the oldest and faintest galaxies in the Universe.
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