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A Super Runner in the Milky Way

21 Jan 2020, 12:00 UTC
A Super Runner in the Milky Way
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Title: Origin of a massive hyper-runaway subgiant star LAMOST-HVS1 – implication from Gaia and follow-up spectroscopy Authors: Kohei Hattori, Monica Valluri, Norberto Castro, Ian U. Roederer, Guillaume Mahler, and Gourav Khullar First Author’s Institution: University of Michigan Status: Published in the Astrophysical Journal, preprint available on arXivLook at that unique runner!Just like our Sun, most stars spend their entire lives in the Milky Way (MW). They follow certain trajectories orbiting the central supermassive blackhole (SMBH) in the galactic center. Coincidentally, humans are not the only ones with dreams of leaving home to see the world — so does a whole group of young and massive (O- and B-type) stars! These travelers are called hypervelocity stars (HVSs, Figure 1). Their velocities are on the order of 1000 km/s! Many HVSs are rebelliously running away from the gravitational influence of the SMBH towards the outside world, living out their short but extraordinary lives.

Figure 1. An astrophysicist-artist’s conception of an HVS speeding away from the visible part of a spiral galaxy like our MW. LAMOST-HVS1 is one of the fastest stars in the MW. (Image credit: Ben Bromley, University of Utah)
One particular runner, LAMOST-HVS1, stands out with its “super speed” ...

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