![]() ![]() Once the tidal tail was unveiled, its presence gave clues to astronomers about F8D1’s history. Effectively mapping the cirrus via MegaCam’s observations complements the observations done with the Hyper-Suprime Cam. The presence of Galactic cirrus previously blocked the view of F8D1’s tidal tail from discovery. Originally optimized for surveys at CFHT, these observations of F8D1 illustrate the complex nature of the galaxy’s structure amid Galactic cirrus features, faint gas clouds between the Earth and F8D1. To help with the analysis of F8D1, the team used a special observing technique unique to CFHT’s MegaCam. The origin of these strange ultra diffuse galaxies have puzzled astronomers for several decades: Are they born this way or are their present-day properties the result of processes that have shaped them over their lifetimes? The galaxy is recognised to be one of the closest examples of an “ultra-diffuse” galaxy. Using observations with Subaru Telescope’s Hyper Suprime-Cam and the Canada-France-Hawai'i Telescope’s MegaCam imager, researchers have mapped the tidal stream of stars from F8D1. This galactic group contains more than 40 member galaxies, including the large spiral galaxy M81, and the galaxies M82 and NGC3077. Their longevity allows astronomers to use their presence to better understand the formation of galaxies.Īstronomers have taken a particular interest in a galaxy known as F8D1, which is part of the large M81 galaxy group located around 11.7 million light years away from our Milky Way galaxy. ![]() The structures formed by these tidal forces are stable over many billions of years. Tidal tails – long, thin, streams of stars trailing behind a galaxy – are the evidence of these interactions. Intense gravitational interactions can tear galaxies apart through a process known as galactic cannibalism. ![]() Life in a galaxy group is gravitationally challenging. ![]()
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