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Recent Podcast
The AstrOlympics Project: DISTANCE
The AstrOlympics Project: DISTANCE
Despite how large some Olympic distances may seem, they are just a tiny fraction of the lengths we see across space. (2016-07-01)


GRS 1915 in 60 Seconds

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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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