realisticThese things show just how versatility JWST’s infrared astronomy is. As revealed, it can be compared with the results of its predecessors, Hubble and Spitzer.
The US, European (European Space Agency) and Canadian (ASC) space agencies on Tuesday, July 12, revealed the first images taken by the largest space telescope, the James Webb Space Telescope (JWST), which was launched in December 2021 by an Ariane 5 rocket. with five different regions of the sky and was chosen to illustrate the instrument’s unprecedented performance, compared to its predecessors, Hubble and Spitzer. Here’s it like never before, compared to the way it was known to us before James Webb.
Here are those images with comparisons from footage taken by Hubble or Spitzer, exploited between 2003 and 2020 that, like JWST, can be seen in infrared. This wavelength makes it possible to observe distant objects, because the wavelengths of the lights they emit are extended by a distance, like the sound of an ambulance siren leaving a hospital. It also makes it possible to see through the interstellar dust that fills galaxies, to the point of making it invisible to the Hubble telescope, for example. So the colors of JWST images are “False”meaning that invisible real wavelengths have been shifted to be visible to the eye in the images.
Of the four tools, the two tools, MIRI and NIRCam, can take pictures with different calibrations explaining the different colors.
Deep field, SMACS 0723
For this first picture, the suspense is over. US President Joe Biden has already breached the ban he agreed with the European and Canadian space agencies to present at a preview, on Monday, July 11, from the White House, before a tour of the Middle East. We see a wonderful cloud of multicolored points of light on a black background. They are hundreds, even thousands of galaxies, concentrated in a tiny fraction of the sky, the size of a grain of sand at the end of the arm.
From one of these galaxies, white on the right, we can clearly see the spiral arms, which are almost indistinguishable from Hubble, who took the same image. The picture also hits very white dots with eight “branches”. These are stars in our galaxy within the telescope’s field of view. The “branches” betray the special geometry of its mirror of 18 hexagons: light reflects off the small borders between them and creates these special shapes.
There are other brilliant points as well, clustered primarily in the center, under the bright star. It’s a compact galaxy cluster, SMACS 0723, more than 4 billion light-years from Earth, which explains the orange arcs in the image. Its massive mass distorts spacetime and bends rays of light in its vicinity, especially those coming from the background. So that JWST sees several images of the same galaxy behind the cluster. If it were perfectly aligned backwards, we would see a perfectly circular ring. The benefit is that it amplifies this far light and thus makes it possible to see more distant objects. It’s like a second telescope.Johann Richard, an astronomer at the Astrophysical Research Center at the Lyon Observatory, explains.
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