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

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Sloan Digital Sky Survey image of Arp 6, also known as NGC 2537 or the Bear’s Paw Galaxy.

NGC 2537 is a blue compact dwarf galaxy. It 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: Sloan Digital Sky Survey
Source: https://commons.wikimedia.org/wiki/File:NGC2537_-_SDSS_DR14.jpg

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Hubble image of Arp 185, also known as NGC 6217.

This was the first image of a celestial object taken with the newly repaired Advanced Camera for Surveys (ACS) after the 2009 Servicing Mission 4, where astronauts upgraded the Hubble Space Telescope.

Credit: NASA, ESA, and the Hubble SM4 ERO Team
Source: https://science.nasa.gov/asset/hubble/barred-spiral-galaxy-ngc-6217/

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Gran Telescopio Canarias image of Arp 84, also known as NGC 5394 and NGC 5395.

This interacting pair is sometimes called the "Heron Galaxy". The larger spiral, NGC 5395 forms the body and wing of the heron and the smaller, two-armed NGC 5394 forms the neck, head, and beak of the bird.

Credit: GTC, IAC
Source: https://www.gtc.iac.es/multimedia/imageGallery.php

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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/

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Hubble Space Telescope image of Arp 25, also known as NGC 2276.

This face-on spiral galaxy looks lopsided, with its core offset to the upper left and a single spiral arm that is separated from the others. It is interacting with the nearby elliptical galaxy NGC 2300, just out of frame.

Credit: NASA, ESA, STScI, P. Sell
Source: https://science.nasa.gov/asset/hubble/ngc-2276/

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Hubble image of Arp 148, also known as Mayall's Object.

The nickname comes from astronomer Nicholas Mayall, who first imaged the object in 1940 and noted it looked like a question mark.

The galaxy to the left likely crashed through the galaxy on the right, creating a ring and triggering a burst of star formation.

Credit: NASA, ESA, STScI, A. Evans, K. Noll, and J. Westphal
Source: https://science.nasa.gov/asset/hubble/hubble-interacting-galaxy-arp-148/

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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

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SDSS image of Arp 82, also known as NGC 2535 and NGC 2536.

Simulations suggest the two galaxies are in the early stages of a merger. The pair already experienced one collision and are just about to collide again.

The larger galaxy's inner arms have evenly spaced "beads on a string" star clusters. This suggests the recent gravitational interactions created shocks that led to a burst of star formation.

Credit: SDSS
Source: https://www.legacysurvey.org/viewer?ra=122.8074&dec=25.2048&layer=sdss&zoom=13

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Kitt Peak image of Arp 30, also known as NGC 6365.

Arp placed this in the category "Spiral galaxies - One heavy arm" in his original 1966 catalog. However, later higher-resolution images show this is actually a pair of interacting galaxies, with one galaxy viewed face-on and one viewed nearly edge-on, not one galaxy with a particularly beefy arm.

Credit: KPNO, NOIRLab, NSF, AURA, Friends' Central School, A. Block
Source: https://noirlab.edu/public/images/noao-n6365fcs1/

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