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This result is reported in the first scientific paper from GALAXY CRUISE. The citizen astronomers’ classifications are made available to the public so that astronomers from all over the world can use them to make new discoveries. Citizen astronomers are by no means professional astronomers, but can they classify galaxies? Yes, they can! Professional astronomers show them how. Citizen astronomers are asked to go through a training course to understand the fundamentals of galaxy morphology. Once they pass the course, they get a boarding pass for GALAXY CRUISE.
The same applies to interacting galaxies, which are the focus of GALAXY CRUISE. When galaxies collide and merge, they often show distorted shapes with characteristic features around them such as tidal tails. These features are often diffuse and faint and can easily be missed. However, thanks to the high sensitivity and high angular resolution of the HSC images, GALAXY CRUISE successfully captured these faint features.
The sample of interacting galaxies revealed that these galaxies show an enhanced level of star formation activity compared to normal galaxies. Furthermore, supermassive black holes are also found to be more active . Interestingly, this activity is most significantly enhanced in violent mergers like those shown in Figure 3. It is likely that the final coalescence of a merger event is the moment when the internal activity of galaxies is most strongly enhanced.
“People may think that scientific work is only for professional researchers. That is not necessarily the case. Public citizens can certainly contribute as GALAXY CRUISE demonstrated. GALAXY CRUISE is still on its continuing voyage. Why not join us? I am looking forward to welcoming you on board and solving the mysteries of galaxies together,” Captain Tanaka concludes.Notes
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