nebulae, exoplanet, group of galaxies … discover all his first images

GrantedThese factors illustrate the versatility of infrared astronomy at JWST. When opened, they can be compared to the results of its predecessors, Hubble and Spitzer.

The American (NASA), European (ESA) and Canadian (ASC) space agencies opened on Tuesday July 12 the first images captured by the largest space telescope, the James-Webb (JWST), launched on December 2021 by Ariane 5 rocket. They were concerned with five different regions of the sky and were chosen to describe the instrument’s unseen performance, compared to its predecessors, Hubble and Spitzer. Here are these things as if they had never been seen before, compared to the way we knew them before the arrival of James-Webb.

Here are these images with comparisons taken from shots taken by Hubble or Spitzer, which were exploited between 2003 and 2020 and which, like JWST, were seen in infrared. This wavelength makes it possible to observe more distant objects, because the wavelengths of the lights they emit are extended by their distance, like the sound of the siren of an ambulance leaving the hospital. It also makes it possible to see through the interstellar dust that inhabits galaxies, to the point that they may not be visible to Hubble, for example. Hence the colors of the JWST images “bakak”in the sense that real, invisible wavelengths are transferred to be seen by the eye in photographs.

Of the four instruments, two will capture images, MIRI and NIRCam, with different calibrations that illuminate different colors.

Deep field, SMACS 0723

The deep-field image of the Universe taken with the James-Webb telescope, was opened on July 11 at the White House by President Joe Biden.

For this first picture, the suspense is over. US President Joe Biden actually broke the embargo that European and Canadian space agencies agreed to present it in preview, Monday July 11, from the White House, before touring the Middle East. We saw an impressive cloud of multi -colored light spots on a black background. Hundreds of them, even thousands of galaxies, are concentrated in a very small part of the sky, the size of a grain of sand at the tip of an arm.

From one of these galaxies, white on the right, we can clearly see the spiral arms, almost unrecognizable for Hubble, taking the same shot. The image also hits very white dots with eight “branches”. These are stars in our galaxy within the field of vision of the telescope. The “branches” betray the particular geometry of its mirror which is composed of 18 hexagons: the light differs small boundaries between them and creates these particular figures.

Also remarkable are the other points, which essentially converge in the middle, under the brightest star. It is a compact cluster of galaxies, SMACS 0723, more than 4 billion light-years from Earth, and explains the presence of orange arcs in the photograph. Its large mass distorts spacetime and distorts light around it, especially those from the background. To see JWST multiple images of the same galaxy located behind the cluster. If it is exactly lined up at the back, we will see a perfectly round ring. The interest is that it amplifies this distant light and therefore makes it possible to see farther objects. “It’s like a second telescope”explained Johan Richard, astronomer at the astrophysical research center at the Lyon observatory.

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