![]() Webb interdisciplinary scientist Rogier Windhorst of Arizona State University and his team obtained the data used in this image from early results of the Prime Extragalactic Areas for Reionization and Lensing Science (PEARLS) JWST Guaranteed Time Observation (GTO) programs, GTO 11. One is likely very dusty and the other very far away, but we – or other astronomers – need to obtain data known as spectra to determine which is which.” Two patchy spirals to the upper left of the elliptical galaxy have similar apparent sizes, but show up in very different colors. “Like many Webb images, this image of VV 191 shows additional galaxies deeper and deeper in the background. Simulations of gravitationally lensed galaxies like this help us reconstruct how much mass is in individual stars, along with how much dark matter is in the core of this galaxy. These images of the lensed galaxy are so faint and so red that they went unrecognized in Hubble data, but are unmistakable in Webb’s near-infrared image. The stretched red arc is warped where it reappears – as a dot – at 4 o’clock. This is a very distant galaxy whose light is bent by the gravity of the elliptical foreground galaxy – and its appearance is duplicated. A faint red arc appears in the inset at 10 o’clock. Examine the white elliptical galaxy at left. “The image holds a second discovery that’s easier to overlook. Credit: NASA, ESA, CSA, Rogier Windhorst (ASU), William Keel (University of Alabama), Stuart Wyithe (University of Melbourne), JWST PEARLS Team Read the full description and download the image files by clicking or tapping the image above. Blue was assigned to two Hubble filters, ultraviolet data taken in 0.34 microns (F336W) and visible light in 0.61 microns (F606W). ![]() In this image, green, yellow, and red were assigned to Webb’s near-infrared data taken in 0.9, 1.5, and 3.56 microns (F090W, F150W, and F356W respectively). ![]() Its light is bent by the gravity of the elliptical foreground galaxy. This is a very distant galaxy whose appearance is warped. Above the white elliptical galaxy at left, a faint red arc appears in the inset at 10 o’clock. Dust grains are partially responsible for the formation of new stars and planets, so we are always seeking to identify their presence for further studies. “Understanding where dust is present in galaxies is important, because dust changes the brightness and colors that appear in images of the galaxies. This target was selected from nearly 2,000 superimposed galaxy pairs identified by Galaxy Zoo citizen science volunteers. “VV 191 is the latest addition to a small number of galaxies that helps researchers like us directly compare the properties of galactic dust. Although the two foreground galaxies are relatively close astronomically speaking, they are not actively interacting. “Webb’s near-infrared data also show us the galaxy’s longer, extremely dusty spiral arms in far more detail, giving the arms an appearance of overlapping with the central bulge of the bright white elliptical galaxy on the left. Webb’s near-infrared data also shows us the galaxy’s longer, extremely dusty spiral arms in far more detail, giving them an appearance of overlapping with the central bulge of the bright white elliptical galaxy on the left, though the pair are not interacting. ![]() ![]() As a result, they were able to identify the effects of interstellar dust in the spiral galaxy. Researchers traced light that was emitted by the bright white elliptical galaxy on the left through the spiral galaxy at right. This image of galaxy pair VV 191 includes near-infrared light from Webb, and ultraviolet and visible light from Hubble. “We got more than we bargained for by combining data from NASA’s James Webb Space Telescope and NASA’s Hubble Space Telescope! Webb’s new data allowed us to trace the light that was emitted by the bright white elliptical galaxy, at left, through the winding spiral galaxy at right – and identify the effects of interstellar dust in the spiral galaxy. Here, Webb interdisciplinary scientist Rogier Windhorst and his team discuss their observations. Editor’s Note : This post highlights data from Webb science in progress, which has not yet been through the peer-review process. ![]()
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