#arpgalaxy — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #arpgalaxy, aggregated by home.social.
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Image of Arp 200, also known as NGC 1134, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Amorphous galaxies - Material ejected from nuclei. NGC 1134 is likely interacting with its small companion, seen to the upper left, producing streamers of stars.
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Hubble image of Arp 94, also known as NGC 3226 and NGC 3227.
The large spiral galaxy, NGC 3227 is interacting with its elliptical galaxy companion, NGC 3226. Faint tidal streams of gas and dust link the pair, showing evidence of their mutual gravitational tugs.
Credit: NASA, ESA, and H. Ford, G. Kober
Source: https://science.nasa.gov/missions/hubble/hubble-captures-a-galactic-dance/ -
Image of Arp 10, also known as UGC 1775, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - Split arms. A galaxy likely collided with Arp 10 near its center, forming a density wave that rippled outwards. This created a ring of new stars in the freshly compacted gas.
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Image of Arp 184, also known as NGC 1961, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Amorphous galaxies - Narrow filament. NGC 1961 is an extremely massive spiral galaxy with irregular arms. It's shape may be the product of interactions with the gas in its galaxy cluster.
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Hubble image of Arp 220, also known as IC 4553.
The image shows the center of the two merging spiral galaxies that make up Arp 220. The merger set off a burst of star formation, which backlights the large amount of dust seen in this visible light view.
The hot, young stars heat the dust, which glows brightly in the infrared. Arp 220 is the closest ultraluminous infrared galaxy.
Credit: NASA, ESA, C. Wilson
Source: https://science.nasa.gov/asset/hubble/super-star-clusters-in-dust-enshrouded-galaxy/ -
Image of Arp 14, also known as NGC 7314, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - Detached segments. NGC 7314 is about 50 million light years away. It has a bright core and an active supermassive black hole at its center.
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Kitt Peak image of Arp 78, also known as NGC 772.
One of NGC 772’s spiral arms is particularly prominent. This is likely due to gravitational interactions with its companion galaxy NGC 770, the small elliptical galaxy in the center near the top of the frame. The interactions left NGC 772's bottom arm elongated and asymmetrical.
Credit: KPNO, NOIRLab, NSF, AURA, A. Block
Source: https://noirlab.edu/public/images/noao-n772block/ -
Hubble image of Arp 224, also known as NGC 3921.
NGC 3921 is a pair of interacting disk galaxies that are in the late stages of a merger. The history of this merger is recorded in the tails and loops that surround the center.
The galaxies were about the same mass and likely collided about 700 million years ago.
Credit: ESA, NASA, J. Schmidt
Source: https://esahubble.org/images/potw1537a/ -
Image of Arp 298, also known as NGC 7469 and IC 5283, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Double and multiple galaxies - Unclassified objects. NGC 7469, the face-on spiral galaxy, and its companion galaxy IC 5283, form an interacting pair.
IC 5283 shows signs of gravitational perturbations caused by its companion, including a tidal tail.
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Image of Arp 18, also known as NGC 4088, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - Detached segments. NGC 4088 is an asymmetric spiral galaxy, located about 40 million light years away.
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Hubble image of Arp 184, also known as NGC 1961.
NGC 1961 is an extremely massive spiral galaxy with irregular arms. Its near side has a large spiral arm dotted with blue star clusters that appears to stretch toward us. Its far side lacks a similarly impressive arm.
Credit: ESA, NASA, J. Dalcanton, R. J. Foley, C. Kilpatrick
Source: https://esahubble.org/images/potw2517a/ -
Image of Arp 12, also known as NGC 2608, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - Split arms. NGC 2608 is a barred spiral galaxy in the constellation Cancer.
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Image of Arp 201, also known as UGC 224, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Amorphous galaxies - Material ejected from nuclei. Arp 201 is an interacting galaxy pair.
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Image of Arp 271, also known as NGC 5426 and NGC 5427, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Double and multiple galaxies - Connected arms. The mutual gravitational interaction of this pair of spiral galaxies distorts their shapes and creates a bridge of gas, dust and young stars that connect the galaxies.
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Canada-France-Hawaii Telescope image of Arp 189, also known as NGC 4651 or the Umbrella Galaxy.
The galaxy gets its nickname from the parasol-shaped feature to the right. It is a stellar stream made of debris from the remains of a tiny galaxy that was ripped apart by the large spiral galaxy.
Credit: Canada-France-Hawaii Telescope, Coelum
Source: https://www.cfht.hawaii.edu/HawaiianStarlight/AIOM/English/CFHT-Coelum-AIOM-Oct2025.html -
Legacy Surveys image of Arp 201, also known as UGC 224.
Arp 201 is an interacting galaxy pair.
Credit: Legacy Surveys, D. Lang, NERSC, Meli thev, Wikimedia Commons
Source: https://commons.wikimedia.org/wiki/File:Arp_201_legacy_dr10.jpg -
Hubble Space Telescope image of Arp 4.
This image contains two galaxies, a larger irregular galaxy, Arp 4, and a small spiral galaxy PGC 6629.
In this image, the luminosity comes from Hubble ACS/WFC observations, and color comes from PanSTARRS.
Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt, Pan-STARRS
Source: https://www.flickr.com/photos/geckzilla/54270938249/ -
Image of Arp 6, also known as NGC 2537 or the Bear’s Paw Galaxy, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - Low surface brightness. It's horseshoe structure may be the result of a shockwave from a nuclear starburst.
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Subaru Telescope and Blackbird Observatory image of Arp 189, also known as NGC 4651 or the Umbrella Galaxy.
The galaxy gets its nickname from the parasol-shaped feature to the left. It is a stellar stream made of debris from a tiny galaxy, only a fiftieth its size, that was shredded apart by gravity as it fell into its larger companion.
Credit: NAOJ, R. Jay GaBany
Source: https://subarutelescope.org/en/results/2014/07/01/2384.html -
Gemini North image of Arp 78, also known as NGC 772.
One of NGC 772’s spiral arms is particularly prominent. This is likely due to gravitational interactions with its companion galaxy NGC 770 (out of frame). The interactions left NGC 772's bottom arm elongated and asymmetrical.
Credit: International Gemini Observatory, NOIRLab, NSF, AURA
Source: https://noirlab.edu/public/images/noirlab2209a/ -
Hubble image of Arp 297, also known as NGC 5754 and NGC 5752.
NGC 5754, the large spiral galaxy, has kinked arms just beyond its inner ring. They are a result of interactions with its companion galaxy, NGC 5752, the smaller galaxy at bottom left. The same interactions triggered a starburst in NGC 5752, creating bright star clusters around its core.
Credit: NASA, ESA, the Hubble Heritage team, W. Keel
Source: https://science.nasa.gov/asset/hubble/hubble-interacting-galaxy-ngc-5754/ -
Spitzer and Hubble image of Arp 142, also known as NGC 2936, NGC 2937, and UGC 5130, or the Penguin and the Egg.
In the "Penguin", dust and gas appear as red filaments at the longer wavelengths of infrared light seen by Spitzer. The "Egg" is nearly featureless and made of older stars. The lack of dust suggests it lost its reservoir of gas and dust needed to new stars.
Credit: NASA, ESA, STScI, AURA, JPL-Caltech
Source: https://www.spitzer.caltech.edu/image/ssc2018-05a-arp-142-the-penguin-and-the-egg -
Spitzer image of Arp 16, also known as M66.
In this infrared image of M66 from the Spitzer Infrared Nearby Galaxy Survey (SINGS), we see a stark contrast between the blue core and bar with a concentration of blue older stars, and the pink bar ends and spiral arms that show dust heated by actively forming stars.
Credit: NASA/JPL-Caltech/R. Kennicutt (University of Arizona) and the SINGS Team
Source: https://www.spitzer.caltech.edu/image/sig05-016-ngc-3627-m66 -
Hubble image of Arp 288, also known as NGC 5221.
In 2016, a supernova appeared in the galaxy's long tidal tail to the right, about 260 thousand light years from the galactic center.
Serving as a backlight, it tells us there is surprisingly little dust in the tail, and that the material was removed from the main galaxy about 800 million years ago.
Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt
Source: https://www.flickr.com/photos/geckzilla/50836792617/in/album-72157706827406804 -
Burrell Schmidt telescope image of Arp 16, also known as M66.
M66 is a member of the Leo Triplet. This small group of galaxies consists of the edge-on spiral galaxy NGC 3628 at upper left, and the nearly face-on spirals M66 at lower left and M65 at lower right.
Credit: REU program, NOIRLab, NSF, AURA
Source: https://noirlab.edu/public/images/noao-m65a66/ -
Image of Arp 84, also known as NGC 5394 and NGC 5395, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - Large, high surface brightness companions. This interacting pair is sometimes called the "Heron Galaxy". The larger spiral, NGC 5395 forms the body of the heron and the smaller, two-armed NGC 5394 forms its neck, head, and beak.
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Hubble image of Arp 190, also known as UGC 2320.
An elliptical galaxy, off the frame, to the left, is interacting with the lower spiral galaxy. A large tidal tail extends to the right. A much fainter bridge extends to the left, connecting the two galaxies. The upper spiral may be part of the system, or it may be a foreground object that only appears to overlap.
Credit: ESA, NASA, J. Dalcanton, J. Schmidt
Source: https://www.flickr.com/photos/geckzilla/47938003673/ -
Image of Arp 290, also known as IC 195 and IC 196, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Double and multiple galaxies - Wind effects. This interacting galaxy pair consists of a larger barred spiral (IC 196, top) and a smaller intermediate spiral (IC 195, bottom).
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Image of Arp 142, also known as NGC 2936, NGC 2937, and UGC 5130, or the Penguin and the Egg, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Elliptical galaxies - Emanating material. The Penguin is a spiral galaxy whose shape has been distorted by the gravity of the elliptical Egg galaxy. The two completed a close pass between 25 and 75 million years ago.
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Hubble image of Arp 195, also known as UGC 4653.
This image of three interacting galaxies is from the Establishing HST's Low Redshift Archive of Interacting Systems snapshot program. These programs fill in gaps in Hubble's schedule (2-3 percent of the available time) with short observations.
In this image, the luminosity is from Hubble ACS/WFC observations, and color is from DECam and SDSS.
Credit: ESA, NASA, J. Dalcanton
Source: https://esahubble.org/images/potw2130a/