![]() Thanks to their bursting stars, these interacting galaxies may have a more blue appearance than other galaxies.Ī starburst galaxy contains a large supply of gas so that it has the material to form new stars. The other type of peculiar galaxy is an interacting galaxy, where the peculiar shape is caused by the interaction of two or more galaxies. These energy flows are most likely to sit at the center of a galaxy, making them the nucleus of that system, hence why it’s called an active galactic nucleus. When gas flows into a black hole, it heats up and emits large amounts of light scientists term this “active” because the black hole is actively growing its mass. For this reason, a peculiar galaxy contains more active galactic nuclei than ordinary galaxies, which indicates that they have supermassive black holes.Īn active galactic nucleus is a term used to describe an active supermassive black hole at the center of a galaxy. Scientists theorize that a peculiar galaxy is formed when two or more galaxies collide. And it was these two scientists that inspired the work of Halton Arp in the 1960s.Īfter spending four years photographing peculiar and distorted galaxies, Arp published the Atlas of Peculiar Galaxies (1966), containing high-resolution photographs of 338 systems. In 1959, Vorontsov-Vel’yaminov published The Atlas and Catalogue of Interacting Galaxies. The first scientist to photograph peculiar galaxies was Fritz Zwicky in the 1950s. He invented this term to describe a galaxy that didn’t fit into any other category. Hubble used the terms elliptical, spiral, and barred spiral to describe and categorize the shape of galaxies an irregular galaxy wasn’t a spiral or an ellipse and was, instead, irregular in shape. Hubble labeled these images elliptical, spiral, barred spiral, and irregular. From 1922 to 1926, he photographed an array of galaxies through the 100-inch Hooker reflector telescope. The first scientist to study morphology – the shape and structure – of galaxies was Edwin Hubble in the 1920s. How Are Peculiar And Irregular Galaxies Different?.
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