Image of Arp 16, also known as M66, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - Detached segments. M66 is a face-on spiral galaxy with a weak bar and loosely wound arms that are full of young star clusters.
Hubble image of Arp 299, also known as NGC 3690.
This image was taken in 2000 with Hubble's WFPC2 instrument to study the galaxies' hottest and brightest stars in ultraviolet light. Blue and green are ultraviolet, red is visible light. The observations show large amounts of interstellar dust in these merging galaxies.
Credit: NASA, R. Windhorst, and the Hubble mid-UV team
Source: https://science.nasa.gov/asset/hubble/a-cosmic-collision-between-two-galaxies-ugc-06471-and-ugc-06472/
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/
Hubble Space Telescope image of Arp 6, also known as NGC 2537 or the Bear’s Paw Galaxy.
NGC 2537 has a nucleus that is rapidly forming stars, surrounded by a horseshoe-shaped structure that is also forming new stars. Since the stars in the nucleus are older, the horseshoe may be the result of a shockwave sent out by the nuclear starburst.
Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt
Source: https://www.flickr.com/photos/geckzilla/46842339755
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/
Kitt Peak National Observatory image of Arp 336, also known as NGC 2685.
NGC 2685 is a polar ring galaxy. It has a ring of gas, stars, and dust that orbits perpendicular to the plane of the galaxy, seen as unusual whorls, or helical filaments. These structures likely formed through an interaction which captured material from another galaxy.
Credit: NOIRLab, AURA, NSF
Source: https://noirlab.edu/public/images/noao-n2685/
Hubble image of Arp 70, also known as VV 341.
Like its more famous cousin M51 (Arp 85, the Whirlpool galaxy), Arp 70 consists of a larger galaxy with two well-defined spiral arms interacting with a small companion. Such interactions have been linked to the production of grand-design spiral arms.
Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt
Source: https://www.flickr.com/photos/geckzilla/48320643492/
GALEX and SDSS image of Arp 24, also known as NGC 3445.
The left panel shows Arp 24 in ultraviolet light from GALEX. The right panel shows the same galaxies from the Sloan Digital Sky Survey in visible light.
The spiral galaxy has one fan-like spiral arm that is dotted with star-forming regions. It is connected to its companion galaxy, seen to the left, by a weak bridge.
Credit: Fig. 1 from Smith et al. 2010.
Source: https://iopscience.iop.org/article/10.1088/0004-6256/139/3/1212
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
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