New JWST Image Shows That Grand Spiral Galaxies had Already Formed 11 Billion Years ago - by ScottyJ_PhD
Most of these galaxies were previously imaged by the Hubble Space Telescope, like EGS-23205, pictured below. . However, in the Hubble images, the bars are largely obscured.JWST has an advantage over Hubble in observing extremely old and distant galaxies, partly because its larger mirror can collect more light from distant, dim objects. But it also has an advantage due to its use of infrared rather than optical wavelengths.
Infrared is also very effective at seeing through gas and dust, enabling JWST to pick out the stellar nurseries in the bars which would otherwise be obscured.the implications of these early forming bars for models of galactic evolution: The location of the Extended Groth Strip in the night sky. The galaxies newly observed by JWST lie within the EGS. Image Credit: NASA, ESA, M. Davis , S. Faber , and A. Koekemoer .
“Bars solve the supply chain problem in galaxies,” Jogee says. “Just like we need to bring raw material from the harbor to inland factories that make new products, a bar powerfully transports gas into the central region where the gas is rapidly converted into new stars at a rate typically 10 to 100 times faster than in the rest of the galaxy…This discovery of early bars means galaxy evolution models now have a new pathway via bars to accelerate the production of new stars at early epochs.
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