Posting images of galaxies in Halton Arp's Atlas of Peculiar Galaxies (1966).
Automated account. Image curation, descriptions, typos, and most alt text by human astronomer @kellylepo.
See posts for image credits and links to the original sources.
Image of Arp 202, also known as NGC 2719 and NGC 2719A, 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. This pair of galaxies, an edge-on disk galaxy near the bottom of the frame and a smaller irregularly shaped galaxy above it, had a recent interaction which likely severely perturbed both galaxies.
Image of Arp 302, also known as UGC 9618 or VV 340, 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. Arp 302 consists of a pair of very gas-rich spiral galaxies in the early stages of an interaction.
Image of Arp 24, also known as NGC 3445, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - One-armed. NGC 3445 has one fan-like spiral arm that is dotted with star-forming regions. It is connected to its companion galaxy, seen nearly edge-on to the left, by a weak bridge. The two galaxies likely had a recent encounter.
Hubble image of Arp 219, also known as UGC 2812.
Arp 219 appears in several catalogs of ring galaxies. The ring, made of tidal tails of material that wrap around the galaxy, was likely formed through interactions with a companion galaxy.
In this image, the luminosity comes from Hubble ACS/WFC observations, and color comes from PanSTARRS.
Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt, PanSTARRS
Source: https://www.flickr.com/photos/geckzilla/46366188324/
Image of Arp 148, also known as Mayall's Object, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Amorphous galaxies - Associated rings. The bottom galaxy likely crashed through the top galaxy, creating a ring and triggering a burst of star formation.
Image of Arp 282, also known as NGC 169 and NGC 169A, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Double and multiple galaxies - Infall and attraction. NGC 169 (left) and NGC 169A (right) are interacting, creating streams of stars, gas and dust that visibly link the pair of galaxies.
Image of Arp 15, also known as NGC 7393, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - Detached segments. NGC 7393 is a barred spiral galaxy in the constellation Aquarius.
Kitt Peak image of Arp 297, also known as NGC 5755, NGC 5753, NGC 5754 and NGC 5752.
This wide view shows two interacting galaxy pairs. The pairs are actually unrelated and are at different distances.
Credit: KPNO, NOIRLab, NSF, AURA, B. Lofquist, A. Block
Source: https://noirlab.edu/public/images/noao-n5754lofquist/
Sloan Digital Sky Survey image of Arp 285, also known as NGC 2854 and NGC 2856.
This pair of galaxies is connected by a bridge of material, indicating a past interaction.
The upper galaxy, NGC 2856, has a clumpy tail extending perpendicular to its disk. It's an example of a “beads on a string” feature, where gravity creates knots of star formation at regular ~3,000 light year intervals.
Credit: SDSS
Source: https://www.legacysurvey.org/viewer?ra=141.0455&dec=49.2227&layer=sdss&zoom=13
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.
