![]() COSMOS-Web is the widest area JWST will observe in its first year, enabling the study of galaxies across a wide range of local environments. Image credit: COSMOS-Web/Kartaltepe, Casey, Franco, Larson, et al./RIT/UT Austin/IAP/CANDIDEĬOSMOS-Web has three primary science goals: furthering our understanding of the Reionization Era, roughly 200,000 to 1 billion years after the Big Bang identifying and characterizing early massive galaxies in the first 2 billion years and studying how dark matter has evolved with the stellar content of galaxies. At lower left are several zoomed-in 10′′ × 10′′ cutouts and one 16′′ × 16′′ cutout showing specific galaxies selected from these first data. The relative position of this mosaic in the survey is shown at upper left. The total area covered by NIRCam here is ∼77arcmin^2. These data cover six visits or pointings out of a total of 152 visits. 5-6, 2023, including the F115W, F150W, F277W, and F444W filters as a color composite. The first epoch of COSMOS-Web NIRCam observations obtained on Jan. When it is finished, this deep field will be astoundingly large and overwhelmingly beautiful.” And yet it’s just 4 percent of the data we will get for the full survey. “It’s one of the largest JWST images taken so far. “This first snapshot of COSMOS-Web contains about 25,000 galaxies-an astonishing number larger than even what sits in the Hubble Ultra Deep Field,” said Casey. The international team includes nearly 100 astronomers from all over the world. Kartaltepe is co-leading COSMOS-Web with principal investigator Caitlin Casey, an associate professor at The University of Texas at Austin. We’ve been working really hard to produce science quality images to use for our analysis and this is just a drop in the bucket of what’s to come.” “Everything worked beautifully and the data are even better than we expected. “It’s incredibly exciting to get the first data from the telescope for COSMOS-Web,” said principal investigator Jeyhan Kartaltepe, an associate professor at Rochester Institute of Technology’s School of Physics and Astronomy. Image credit: COSMOS-Web/Kartaltepe, Casey, Harish, Liu, et al./RIT/UT Austin/IAP/CANDIDE At left is a comparison between Spitzer IRAC channel 4 (8μm) data and MIRI 7.7μm data in a 40′′ × 40′′ zoom-in panel. Covering six visits, the MIRI data are distributed in six non-overlapping tiles and include data from both the MIRI imager and Lyot Coronograph field of view. The first epoch of COSMOS-Web MIRI observations obtained on Jan. ![]()
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