Image of Arp 78, also known as NGC 772 and NGC 770, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - Small, high surface brightness companions. One of NGC 772’s spiral arms is particularly prominent, likely due to gravitational interactions with its companion galaxy NGC 770 (right). The interactions left the arm elongated and asymmetrical.
Gemini South image of Arp 271, also known as NGC 5426 and NGC 5427.
This pair of interacting galaxies are tugging on each other with gravity, which has begun to distort their features. We can see this in the bridge of stars connecting the spiral arms of NGC 5426, the upper left galaxy, with NGC 5427, the lower right galaxy.
Credit: International Gemini Observatory, NOIRLab, NSF, AURA
Source: https://noirlab.edu/public/images/gemini0805a/
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/
Composite image of Arp 298, also known as NGC 7469 and IC 5283.
X-rays from Chandra (purple) are overlaid on a Hubble visible/infrared and JWST infrared image of NGC 7469.
Large, red diffraction spikes and X-ray light near the center signal the presence of a supermassive black hole.
Credit: NASA, CXC, X. Xu; NASA, ESA, UVA, NRAO, A. S. Evans, Hubble Heritage team; NASA, ESA, CSA, L. Armus, A. S. Evans; J. Major
Source: https://chandra.harvard.edu/photo/2024/25th/more.html
Hubble image of Arp 284, also known as NGC 7714 and NGC 7715.
In this image of NGC 7714, we see a golden loop of of Sun-like stars that has been separated from the young, blue stars in the arms and bar of the galaxy. They were pulled like taffy during a close encounter with its companion galaxy, NGC 7715 (out of frame), about 100 million to 200 million years ago.
Credit: NASA, ESA, A. Gal-Yam
Source: https://science.nasa.gov/asset/hubble/ngc-7714/
Chandra and Hubble image of Arp 302, also known as UGC 9618 or VV 340.
Arp 302 consists of a pair of very gas-rich spiral galaxies in the early stages of interaction.
The Chandra data (pink) shows that the upper galaxy has an obscured, active supermassive black hole.
Credit: NASA, CXC, IfA, D.Sanders et al, STScI, NRAO, A.Evans et al
Source: http://chandra.harvard.edu/photo/2011/vv340/
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
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.
Legacy Surveys image of Arp 10, also known as UGC 1775.
About 85 million years ago, another galaxy likely collided with Arp 10 near its center. This created a density wave that spread outwards, like a ripple in a pond, forming a ring of new stars in the freshly compacted gas. The intruder galaxy appears as a knot below and left of the nucleus.
Credit: Legacy Surveys, D. Lang, NERSC, Meli thev, Wikimedia Commons
Source: https://commons.wikimedia.org/wiki/File:Arp_10_legacy_dr10.jpg
Kitt Peak National Observatory image of Arp 18, also known as NGC 4088.
NGC 4088 is an asymmetric spiral galaxy, located about 40 million light years away.
Credit: KPNO, NOIRLab, NSF, AURA, Bonnie Fisher, Mike Shade, Adam Block
Source: https://noirlab.edu/public/images/noao-n4088shade/
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