In addition to the mass distribution, observational data also helps understand other characteristics of the lensing cluster, said Raquel Fores Toribio, a postdoctoral student at the University. Understanding Mass Distribution in Lensing Clusters The stars bunch up in the blue ring-like feature toward the right side of the image. Large groups of young blue stars indicate the locations of star clusters and star-forming regions. "Measuring these time delays helps to better understand the properties of galaxies and clusters of galaxies, their mass, and its distribution, in addition to providing new data for the estimation of the Hubble constant," Lozano said. Moving out from this central galactic bulge, the panorama sweeps from the galaxys central bulge across lanes of stars and dust to the sparser outer disk. It all helps them to understand how it affects the path of light from a distant quasar. So, astronomers need all the data they can get about the distribution of matter in a cluster. Picture of the Day The first one Daniel Beaulieu from Quebec, Canada The Dumbbell Nebula, also known as Messier 27, is a planetary nebula in the constellation Vulpecula the Fox. That can affect the path of light through the cluster. The featured image is a combination of radio images from the VLA and. Pictured, the trail of the pulsar is visible extending to the lower left of the supernova remnant. It turns out that the mass of all the 'stuff' in the cluster is spread out unevenly. Astronomy Picture of the Day Discover the cosmos Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Traveling over 1,000 kilometers per second, the pulsar PSR J0002+6216 (J0002 for short) has already left the supernova remnant CTB 1, and is even fast enough to leave our Galaxy. And if you see it as an eagle, or a diamond ring, or a llama, well that's perfectly okay too.The combined gravity of the galaxies, plus the intermingled dark matter in the cluster can entangle light from more distant objects as it passes through or near the cluster. So let the bright star Vega lead you to Lyra, the harp constellation, in the June sky. It's also home to the famous Ring Nebula, where a star has blown off most of its outer layers, leaving behind a remnant star known as a white dwarf. It's sometimes described as looking a bit like a diamond ring, with Vega as the diamond.Īnd that's not the only ring in Lyra. It's the fifth brightest star in the sky and the second brightest in the Northern Hemisphere, after Sirius.Ī pair of binoculars will help you see the others stars in Lyra, which form a sort of parallelogram hanging beneath it. Earth, Jupiter, Mars: Every planet in our solar system is a sphere. Vega is by far the brightest star in Lyra. Big, hugely massive things tend to congeal into spheres. In the Northern Hemisphere, you'll find it halfway up the eastern sky in the first couple of hours after dark in June. In Arab cultures, as well as ancient Egypt and India, Lyra was seen as an eagle.Īnd the Inca of South America saw it as a llama.įind Lyra by looking for Vega, which is the westernmost of the three bright stars in the Summer Triangle. The image, which features thousands of stars and galaxies shining brightly, was shared on Monday. It represents a lyre, or harp, played by the musician Orpheus in Greek mythology. In celebration of Labor Day this year, NASA shared a new Hubble image of a star cluster on Instagram. Credit: NASA/JPL-Caltechįinally in June, a quick introduction to one of the smaller constellations that's home to one of the brightest stars. The galaxy cluster lens creates a line of maximum magnification line where superposed background objects may appear magnified many thousands of times. Lyra is easy to locate in the sky, thanks to the brightness of Vega, which is part of the Summer Triangle asterism. This distorted background galaxy - so far away it has a redshift of 6.2 - appears in the featured image as a long red string, while beads on that string are likely to be star clusters.
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