2025.07.30 - F. Jay Lockman (GBO NRAO), Kinematics of Neutral Gas in the Fermi Bubble wind
Автор: Green Bank Observatory
Загружено: 2025-07-30
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Abstract: A new survey with the Green Bank Telescope over about 500 sq-degrees around the Galactic center has detected numerous neutral HI clouds entrained in the Milky Way's nuclear wind.
A sample of more than 200 of these "Fermi Bubble clouds" – selected from those that have the largest values of VLSR -- has been analyzed to examine the kinematics of the out-flowing neutral gas. Clouds are found between -335 less than VLSR less than +438 km/s; these are the largest positive LSR velocities ever reported for neutral gas in the Milky Way. The highest velocities are found furthest from the Galactic center, consistent with a model in which clouds are accelerated with a low outflow velocity close to the center, but reach velocities of at least 500 km/s at a distance of 4 kpc from the center. There are many outstanding questions about this population.
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