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Recent Podcast
A Quick Look at W51
A Quick Look at W51
Because of its relative proximity, the giant molecular cloud W51 provides astronomers with an excellent opportunity to study how stars are forming in our Milky Way galaxy. (2017-07-12)

GRS 1915 in 60 Seconds

Narrator (April Hobart, CXC): We start with an optical and infrared image that shows the crowded area around the object known as GRS 1915+105, or GRS 1915 for short. Next is a close-up of the Chandra image of GRS 1915, which is located near the plane of the Milky Way. GRS 1915 is a so-called micro-quasar that contains a black hole about fourteen times the mass of the sun, which in turn is pulling material off a nearby companion star. With its high-energy transmission grating, Chandra has observed GRS 1915 eleven times since 1999. These studies reveal that a jet from the black hole in GRS 1915 may be periodically choked off when a hot wind is driven off the disk surrounding the black hole. Conversely, once the wind dies down, the jet can re-emerge. These results suggest that this type of black hole may have a mechanism for regulating the rate at which it grows.

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