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DESI-HVS1 is an old hypervelocity star ejected from the galactic center, observations suggest

phys.org·Tomasz Nowakowski·about 1 month ago
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Credit: Image generated by the editorial team using AI for illustrative purposes. Chinese astronomers report the discovery of DESI-HVS1, which may be an old metal-poor hypervelocity star of galactic center origin. The finding, based on the data from the Dark Energy Spectroscopic Instrument (DESI) and ESA's Gaia satellite, was detailed in a research paper published April 23 on the arXiv pre-print server. What are hypervelocity stars and where to find them? Hypervelocity stars (HVSs) have substantially higher velocities (usually exceeding 500 km/s) than the rest of the stellar population of a galaxy, which allows them to even escape their host galaxies. They are usually produced by the so-called Hills mechanism when a binary system is disrupted by a supermassive black hole (SMBH) in the center of a galaxy. Given that the galactic center , with its SMBH's strong gravitational potential, is one of the most dynamically extreme environments in the Milky Way, it produces frequent dynamical interactions.…

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