File:Rings and things (potw2433a).jpg
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[edit]DescriptionRings and things (potw2433a).jpg |
English: The subject of this week’s circular Hubble Picture of the Week is situated in the Perseus Cluster, also known as Abell 426, 320 million light-years from Earth. It’s a barred spiral galaxy known as MCG+07-07-072, seen here among a number of photobombing stars that are much closer to Earth than it is.MCG+07-07-072 has quite an unusual shape, for a spiral galaxy, with thin arms emerging from the ends of its barred core to draw a near-circle around its disc. It is classified, using a common extension of the basic Hubble scheme, as an SBc(r) galaxy: the c denotes that its two spiral arms are loosely wound, each only performing a half-turn around the galaxy, and the (r) is for the ring-like structure they create. Rings in galaxies come in quite a few forms, from merely uncommon, to rare and astrophysically important!Lenticular galaxies are a type that sit between elliptical and spiral galaxies. They feature a large disc, unlike an elliptical galaxy, but lack any spiral arms. Lenticular means lens-shaped, and these galaxies often feature ring-like shapes in their discs. Meanwhile, the classification of “ring galaxy” is reserved for peculiar galaxies with a round ring of gas and star formation, much like spiral arms look, but completely disconnected from the galactic nucleus - or even without any visible nucleus! They’re thought to be formed in galactic collisions. Finally, there are the famous gravitational lenses, where the ring is in fact a distorted image of a distant, background galaxy, formed by the ‘lens’ galaxy bending light around it. Ring-shaped images, called Einstein rings, only form when the lensing and imaged galaxies are perfectly aligned.[Image Description: A galaxy. It is almost circular. It has a glowing bar stretching across its core; from the ends of the bar, thin spiral arms wrap around the galaxy to form a closed disc. The arms are fuzzy from the dust and stars they contain. The galaxy is on a black, mostly-empty background. A few foreground stars with cross-shaped diffraction spikes can be seen, as well as some distant galaxies in the background.] |
Date | 12 August 2024 (upload date) |
Source | Rings and things |
Author | ESA/Hubble & NASA, I. Chilingarian |
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Source | ESA/Hubble |
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Credit/Provider | ESA/Hubble & NASA, I. Chilingarian |
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Date and time of data generation | 06:00, 12 August 2024 |
Software used | Adobe Photoshop 25.9 (Windows) |
File change date and time | 15:13, 4 August 2024 |
Date and time of digitizing | 11:20, 24 June 2024 |
Date metadata was last modified | 17:13, 4 August 2024 |
Unique ID of original document | xmp.did:a8bb47e6-2e25-894d-8aa0-67a703373a79 |
Keywords | MCG+07-07-072 |
Contact information |
ESA Office, Space Telescope Science Institute, 3700 San Martin Dr Baltimore, MD, 21218 United States |
IIM version | 4 |