Hubble Captures Stunning Image of One-Armed Spiral Galaxy Arp 184
The Hubble Space Telescope has delivered another breathtaking image, this time showcasing the peculiar spiral galaxy Arp 184 (NGC 1961). Located approximately 190 million light-years away in the constellation Camelopardalis, this galaxy stands out due to its asymmetrical structure, most notably its single, prominent spiral arm.
Why is this galaxy so special? Arp 184 is included in the Atlas of Peculiar Galaxies, compiled by Halton Arp, which features galaxies that deviate from the typical spiral or elliptical shapes. This particular galaxy's distinct characteristic is its single, broad, star-studded spiral arm that appears to reach out towards us, while the opposite side contains only faint wisps of gas and stars. This unique formation has captivated astronomers and space enthusiasts alike.
The image is a composite of data from three Snapshot observing programs, short observations that fill gaps in Hubble's schedule. Interestingly, one of these programs was specifically designed to study galaxies cataloged in the Atlas of Peculiar Galaxies. Arp 184 was also targeted due to its history of hosting multiple supernovas. In fact, it's hosted four known supernovas in the past four decades (in 1998, 2001, 2013 and 2021), making it a prime target for supernova hunters.
William Herschel, the German-British astronomer who discovered Uranus, first spotted Arp 184 back in 1788. This galaxy serves as a reminder that the universe is full of surprises, with structures far more diverse than our own Milky Way, which has two major spiral arms and several smaller ones.
The existence of galaxies like Arp 184 challenges our understanding of galactic formation and evolution. The interactions with other galaxies, or internal processes, might be responsible for its unusual shape. Further research and observations are needed to unravel the mysteries behind this one-armed spiral galaxy.
What do you think could have caused Arp 184’s unique shape? Share your thoughts and theories in the comments below!
