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Astronomers measure and model a blazing gamma-ray source

6 June 2016 Astronomy Now

A blazar is a galaxy whose central supermassive black hole emits a powerful jet of high velocity particles aimed almost directly at Earth. Astronomers have measured and successfully modelled the very high energy gamma ray emission from a blazar known as 1ES 1741+196 using VERITAS, the Very Energetic Radiation Imaging Telescope Array System.

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Gamma rays from distant blazar galaxy tell story of an epic escape

16 December 2015 Astronomy Now

In April 2015, after travelling for about half the age of the universe, a flood of powerful gamma rays from a distant galaxy slammed into Earth’s atmosphere. Observations of PKS 1441+25, a rare type of galaxy called a blazar, provide a look into the environment near a supermassive black hole at the galaxy’s centre and offer a glimpse into the state of the cosmos 7 billion years ago.