Astronomers have found a "loud" radio galaxy that emits gamma radiation

A team of scientists led by Gabriele Bruni from the National Institute of Astrophysics in Rome, Italy,

announced the discovery of the galaxy IGR J18249-3243.It turned out that it emits high-energy gamma radiation. The properties of the object suggest that it can be classified as a Fanaroff-Riley (FRII) type radio galaxy.

IGR J18249-3243 was first discovered in 2006spacecraft INTERnational Gamma-Ray Astrophysics Laboratory (INTEGRAL). Previous observations have shown that the redshift of the galaxy is 0.355. This means that IGR J18249-3243 is a radio loud object with complex radio morphology and a steep radio spectrum. Now gamma radiation has also been detected from the galaxy.

Image of IGR J18249-3243. Credit: Bruni et al., 2022

Radio galaxies emit a huge amountradio waves from their central nuclei. Their black holes at their centers accrete gas and dust, generating high-energy jets, visible in the radio range, that accelerate electrically charged particles to high speeds. Depending on the absence or presence of hot spots at the edges of their jets, astronomers divide radio galaxies into two Fanaroff-Riley classes: I (FRI) and II (FRII).

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