Arp Bot 🤖

@ArpBot
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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.

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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Hubble image of Arp 186, also known as NGC 1614.

NGC 1614 is likely the remnant of a tidal interaction and the resulting merger of two galaxies — a large spiral and a much smaller companion.

Credit: NASA, ESA, STScI
Source: https://science.nasa.gov/asset/hubble/hubble-interacting-galaxy-ngc-1614/

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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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JWST NIRCam image of Arp 142, also known as NGC 2936 and NGC 2937, or the Penguin and the Egg.

The blue haze in the distorted spiral galaxy, elliptical galaxy, and the bridge connecting the two are stars. The red filaments are glowing dust. The edge-on galaxy at top right is in the foreground, significantly closer to us than the Penguin and the Egg.

Credit: NASA, ESA, CSA, STScI
Source: https://webbtelescope.org/contents/media/images/2024/124/01J06XYGEDEE86D1H9N5EJ9EG0

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Image of Arp 91, also known as NGC 5953 and NGC 5954, 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. NGC 5953 (center) and NGC 5954 (left) show clear signs of interaction. A spiral arm or tidal tail from NGC 5954 extends to the side and connects to its companion.

Source: https://ned.ipac.caltech.edu/level5/Arp/Arp23.html

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GALEX and SDSS image of Arp 297, also known as NGC 5755, NGC 5753, NGC 5754 and NGC 5752.

The left image from GALEX shows Arp 297 in ultraviolet light. The right image shows the same galaxies from the Sloan Digital Sky Survey in visible light.

While the upper and lower pairs of galaxies are interacting with their companions, the pairs are unrelated and are at different distances.

Credit: Fig. 13 from Smith et al. 2010.
Source: https://iopscience.iop.org/article/10.1088/0004-6256/139/3/1212

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JWST NIRCam image of Arp 142, also known as NGC 2936 and NGC 2937, or the Penguin and the Egg.

In this wide view, we see the Penguin (laying on its back) and the Egg, and the foreground edge-on spiral PGC 1237172. There are also a large number of distant galaxies, some seen as tiny spirals and ellipticals, and many appearing as dots.

Credit: NASA, ESA, CSA, STScI
Source: https://webbtelescope.org/contents/media/images/2024/124/01J06XYGEDEE86D1H9N5EJ9EG0

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Hubble Space Telescope image of Arp 26, also known as M101 or the Pinwheel Galaxy.

The image is made with of 51 individual Hubble exposures with additional data from the Canada-France-Hawaii Telescope and Kitt Peak National Observatory.

Credit: NASA, ESA, STScI; CFHT, NOAO, AURA, NSF
Source: https://science.nasa.gov/asset/hubble/hubbles-largest-galaxy-portrait-offers-a-new-high-definition-view/

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Kitt Peak image of Arp 84, also known as NGC 5394 and NGC 5395.

The center of the smaller distorted spiral NGC 5394 is undergoing a burst of star formation. Interactions between this galaxy pair funneled gas into the center of NGC 5394, providing the raw materials for new stars.

Credit: KPNO, NOIRLab, NSF, AURA, D. Matthews, E. J. Jones, A. Block
Source: https://noirlab.edu/public/images/noao-n5394matthews/

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Hubble image of Arp 200, also known as NGC 1134.

NGC 1134 is likely interacting with its small companion, seen to the lower right, producing streamers of stars that trail off to the right.

Credit: NASA, ESA, STScI, Julianne Dalcanton, Meli thev, Wikimedia Commons
Source: https://commons.wikimedia.org/wiki/File:NGC_1134_Hubble_F606W.jpg

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