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For UVA Astronomers, New Space Telescope Could Be a ‘Game-Changer’
When the James Webb Space Telescope launches in October, it will be the world’s premier space science observatory. Its combination of high-resolution and infrared-detecting instruments is expected to provide astronomers with a wealth of detailed data – not only on individual stars in the local universe, but also an unprecedented level of detail of what’s happening at the cores of other galaxies.
Among those eagerly awaiting the Webb telescope’s launch are a pair of University of Virginia astronomers leading and working on two of the 13 Early Release Science projects selected by NASA and its partners, the European Space Agency and the Canadian Space Agency, to test its capabilities. Data from Aaron Evans’s and Nitya Kallivayalil’s projects, as well as from the other 11 Early Release Science programs, will be made available to other astronomers immediately, and archived for future research.
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IMAGE: The Zwicky Transient Facility captured this snapshot of tidal disruption event AT2019dsg, circled, on Oct. 19, 2019. view more
Credit: ZTF/Caltech Optical Observatories
For only the second time, astronomers have linked an elusive particle called a high-energy neutrino to an object outside our galaxy. Using ground- and space-based facilities, including NASA s Neil Gehrels Swift Observatory, they traced the neutrino to a black hole tearing apart a star, a rare cataclysmic occurrence called a tidal disruption event. Astrophysicists have long theorized that tidal disruptions could produce high-energy neutrinos, but this is the first time we ve actually been able to connect them with observational evidence, said Robert Stein, a doctoral student at the German Electron-Synchrotron (DESY) research center in Zeuthen, Germany, and Humboldt University in Berlin. But it seems like this particular event, called AT2019dsg, didn t generate the neutrino when or how
A Famous Black Hole Gets a Massive Update
Cygnus X-1, one of the first identified black holes, is much weightier than expected, raising new questions about how such objects form.
An artist’s impression of the Cygnus X-1 system, a black hole with its orbiting companion star, HDE 226868, 7,200 light-years from Earth. Credit.International Centre for Radio Astronomy Research
Feb. 18, 2021
One of the biggest and first known black holes in the Milky Way galaxy is more massive than astronomers thought, a team of scientists announced on Thursday. The finding throws a wrench into long-held models of how massive stars evolve on the way to the ultimate doom.