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Hubble captures galaxy pair Arp-Madore 2339-661

October 27, 2023
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Hubble captures galaxy pair Arp-Madore 2339-661
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Image: Hubble captures galaxy pair Arp-Madore 2339-661
Credit score: ESA/Hubble and NASA, J. Dalcanton, Darkish Power Survey/DOE/FNAL/NOIRLab/NSF/AURA; Acknowledgement: L. Shatz

This placing picture from the NASA/ESA Hubble Area Telescope captures the interacting galaxy pair generally known as Arp-Madore 2339-661. The Arp-Madore catalog is a set of weird galaxies, and this group’s specific peculiarity is perhaps odder than first meets the attention, as there are three galaxies interacting right here, not simply two.

The 2 clearly outlined galaxies are NGC 7733 (smaller, decrease proper) and NGC 7734 (bigger, higher left). The third galaxy is at the moment known as NGC 7733N and is seen for those who look fastidiously on the higher arm of NGC 7733. There you may spot knot-like construction, glowing with a special colour than the arm and obscured by darkish mud. This might simply cross as a part of NGC 7733, however evaluation of the velocities (pace and course) concerned reveals that this knot has a substantial further redshift.

This implies it is vitally seemingly its personal entity and never a part of NGC 7733. This galaxy group presents one of many many challenges that observational astronomers face: figuring out whether or not an astronomical object actually is only one, or a number of objects, one mendacity in entrance of one other as seen from Earth’s perspective.

All three galaxies lie fairly shut to one another, roughly 500 million light-years from Earth within the constellation Tucana, and, as this picture exhibits, they’re interacting gravitationally with each other. Actually, some science literature refers to them as a ‘merging group,’ which suggests they are going to finally develop into a single entity.

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