Arp Bot 🤖

Hello World! I'm an automated account created by the human astronomer @kellylepo.bsky.social to post random images of galaxies that are in Halton Arp's Atlas of Peculiar Galaxies (1966). Image curation, post text, typos, and most alt text are by @kellylepo.bsky.social.

Image of Arp 91, also known as NGC 5953 and NGC 5954, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Spiral galaxies - Large, high surface brightness companions. A tidal tail connects the pair. Source

JWST and Hubble image of Arp 142, also known as NGC 2936 and NGC 2937, or the Penguin and the Egg. In Hubble’s visible light image (left) a dark brown dust lane crosses the Penguin. In Webb’s near-infrared view (right), this dust is fainter. Credit: NASA, ESA, CSA, STScI Source

Image of Arp 16, also known as M66, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Spiral galaxies - Detached segments. M66 has loose arms full of young star clusters. Source

Gran Telescopio Canarias image of Arp 30, also known as NGC 6365. Arp thought this was one galaxy with a particularly beefy arm. Later images show this is actually a pair of interacting galaxies, with one galaxy viewed face-on and one viewed nearly edge-on. Credit: GTC, IAC Source

Very Large Telescope image of Arp 222, also known as NGC 7727. The swirling loops of material seen in NGC 7727 are the remnants of a galactic merger that started around a billion years ago, when a smaller, gas-rich young galaxy fell into a larger galaxy. Credit: ESO Source

JWST image of Arp 16, also known as M66. This image was taken as part of the PHANGS program, to learn how the small details of how stars form influence the large structures of galaxies. Credit: NASA, ESA, CSA, STScI, J. Lee (STScI), T. Williams (Oxford), PHANGS Team Source

Image of Arp 104, also known as NGC 5216 and NGC 5218, or Keenan’s System, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Elliptical galaxies - Connected to spiral galaxies. Source

JWST NIRCam and MIRI image of Arp 142, also known as NGC 2936, NGC 2937, and UGC 5130, or the Penguin and the Egg. The Penguin is a spiral galaxy whose shape has been distorted by the gravity of the elliptical Egg galaxy. Credit: NASA, ESA, CSA, STScI Source

Image of Arp 285, also known as NGC 2854 and NGC 2856, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Double and multiple galaxies - Infall and attraction. This pair had a past interaction. Source

NuStar image of Arp 299, also known as NGC 3690. X-ray light from NuSTAR highlights an active supermassive black hole in one of the galaxies in the pair Arp 299. The other galaxy lacks an active black hole and is not seen in the image. Credit: NASA, JPL-Caltech, GSFC Source

Ground-based image of Arp 16, also known as M66. M66 is a member of the Leo Triplet. NGC 3628, the galaxy in the upper left, likely had an encounter with M66 a few hundred million years ago, creating a dramatic tail-like plume. Credit: Fig 1, G. Wu et al. (2022) Source

Very Large Telescope image of Arp 271, also known as NGC 5426 and NGC 5427. This pair of interacting galaxies was the final image captured by the VIsible Multi-Object Spectrograph (VIMOS) instrument before it was decommissioned in 2018. Credit: ESO, Juan Carlos Muñoz Source

New Technology Telescope image of Arp 271, also known as NGC 5426 and NGC 5427. The mutual gravitational interaction of this pair of spiral galaxies distorts their shapes and creates a bridge of gas, dust and young stars that connect the galaxies. Credit: ESO Source

Image of Arp 23, also known as NGC 4618, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Spiral galaxies - One-armed. Its unusual shape may come from interactions with its companion. Source

Hubble image of Arp 240, also known as NGC 5257 and NGC 5258. NGC 5257 (left) and NGC 5258 (right), two spiral galaxies of similar mass and size, are in the early stages of a merger. Credit: NASA, ESA, STScI Source

Hubble image of Arp 81, also known as NGC 6621 and NGC 6622. A recent encounter between NGC 6621 (right) and NGC 6622 (left) pulled a long tail out of NGC 6621 that wraps behind the galaxy. Credit: NASA, ESA, STScI Source

Planewave CDK24 image of Arp 225, also known as NGC 2655. NGC 2655 is a giant lenticular galaxy, a galaxy that has a disk but not spiral arms. The outer ripples may be the result of a recent merger with a smaller galaxy. Credit: KuriousGeorge, Wikimedia Commons Source

Hubble image of Arp 194, also known as UGC 6945. This interacting galaxy group includes a pair of merging galaxies with two nuclei and trails of blue super star clusters at top and a single large spiral galaxy at bottom. Credit: NASA, ESA, and the Hubble Heritage Team Source

Kitt Peak National Observatory image of Arp 104, also known as NGC 5216 and NGC 5218, or Keenan’s System. A bridge of stars and gas about 7,000 light years wide and 150,000 light years long connects the two galaxies. Credit: NOIRLab, NSF, AURA, T.A. Rector, H. Schweiker Source

Kitt Peak image of Arp 30, also known as NGC 6365. Arp thought this was one galaxy with a particularly beefy arm. Later images show this is actually a pair of galaxies, one face-on and one nearly edge-on. Credit: KPNO, NOIRLab, NSF, AURA, Friends' Central School, A. Block Source

Image of Arp 194, also known as UGC 6945, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Amorphous galaxies - Material ejected from nuclei. This interacting group has several spiral galaxies. Source

Hubble image of Arp 226, also known as NGC 7252 or the Atoms for Peace Galaxy. It's peaceful nickname is somewhat ironic — its tidal tails, shells, and ripples reveal a violent merger between two gas-rich spiral galaxies in its past. Credit: NASA ESA, J. Schmidt Source

Image of Arp 70, also known as UGC 934, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Spiral galaxies - Small, high surface brightness companions. The large galaxy interacts with its companion. Source

Chandra, Hubble, and JWST image of Arp 220, also known as IC 4553. The hottest gas, which glows in X-rays, is shown in purple, overlayed on a infrared and visible light view of the merging galaxies. Credit: NASA, CXC, SAO, ESA, CSA, STScI, L. Frattare, J. Major Source

Spitzer image of Arp 82, also known as NGC 2535 and NGC 2536. The larger galaxy's inner arms have evenly spaced "beads on a string" star clusters, likely created by recent gravitational interactions that led to a burst of star formation. Credit: NASA, JPL-Caltech, M. Hancock Source

VLT image of Arp 16, also known as M66. M66 is a face-on spiral galaxy with a weak bar feature, seen in yellow, and loosely wound arms that are full of young, blue star clusters. Credit: ESO, P. Barthel Source

Image of Arp 13, also known as NGC 7448, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Spiral galaxies - Detached segments. It has particularly bright spiral arms. Source

Hubble image of Arp 217, also known as NGC 3310. NGC 3310 is a distorted spiral galaxy undergoing a burst of star formation that began about 100 million years ago. A merger with a smaller galaxy may have triggered the starburst. Credit: NASA, ESA, The Hubble Heritage Team Source

Image of Arp 284, also known as NGC 7714 and NGC 7715, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Double and multiple galaxies - Infall and attraction. The pair had a recent encounter. Source

Hubble and Dark Energy Camera image of Arp 122, also known as NGC 6040 and LEDA 59642. This pair of galaxies are in the midst of a collision, warping the top spiral NGC 6040. Credit: ESA, NASA, J. Dalcanton, Dark Energy Survey, DOE, FNAL, DECam, CTIO, NOIRLab, NSF, AURA Source

Hubble image of Arp 70, also known as VV 341. In Arp 70, a larger galaxy with two well-defined spiral arms interacts 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

image of Arp 193, also known as IC 883. IC 883 is likely the remnant of the merger of two disk galaxies, since it has two tidal tails. The merger triggered a burst of star formation, creating the bright star clusters seen in the center. Credit: NASA, ESA, STScI Source

Image of Arp 202, also known as NGC 2719 and NGC 2719A, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Amorphous galaxies - Material ejected from nuclei. Arp 202 is an interacting galaxy pair. Source

Gran Telescopio Canarias image of Arp 271, also known as NGC 5426 and NGC 5427. The mutual gravitational interaction of this pair of spiral galaxies distorts their shapes and creates a bridge of gas, dust and young stars that connect the galaxies. Credit: GTC, IAC Source

Gemini South image of Arp 222, also known as NGC 7727. About a billion years ago, a smaller, galaxy collided and merged with NGC 7727, creating the swirling loops of material seen in its outskirts. Credit: International Gemini Observatory, NOIRLab, NSF, AURA Source

Image of Arp 7, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Spiral galaxies - Split arms. It is a barred spiral galaxy in the constellation Hydra. Source

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, also has a clumpy tail perpendicular to its disk. Credit: SDSS Source

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. Credit: NASA, ESA, STScI, A. Evans, K. Noll, and J. Westphal Source

Image of Arp 282, also known as NGC 169 and NGC 169A, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Double and multiple galaxies - Infall and attraction. Tidal streams visibly link the pair. Source

Kitt Peak image of Arp 94, also known as NGC 3226 and NGC 3227. The large spiral galaxy, NGC 3227 is interacting with its elliptical galaxy companion, NGC 3226. Faint tidal streams of gas and dust link the pair. Credit: KPNO,NOIRLab,NSF/AURA/Sid Leach and Wil Milan/Adam Block Source

Image of Arp 147, also known as IC 298, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Amorphous galaxies - Associated rings. The right galaxy's ring formed when its companion hit its center. Source

Hubble Space Telescope image of Arp 26, also known as M101 or the Pinwheel Galaxy. The image is made from 51 individual Hubble exposures, plus data from the Canada-France-Hawaii Telescope and Kitt Peak National Observatory. Credit: NASA, ESA, STScI; CFHT, NOAO, AURA, NSF Source

GALEX and SDSS image of Arp 24, also known as NGC 3445. The left image from GALEX shows NGC 3445 in ultraviolet light. The right image shows the same galaxies from the Sloan Digital Sky Survey in visible light. Credit: Fig. 1 from Smith et al. 2010. Source

Ground-based image of Arp 25, also known as NGC 2276. NGC 2276 (left) is being pulled by the neighboring galaxy NGC 2300 (right). NGC 2276 is rich in new star formation along its spiral arms. Credit: NASA, ESA, STScI, Adam Block (Steward Observatory) Source

Hubble Space Telescope image of Arp 4. This image contains two galaxies, a larger irregular galaxy, Arp 4, and a small spiral galaxy PGC 6629. Credit: NASA, ESA, STScI, Julianne Dalcanton, Meli thev, Wikimedia Commons Source

Hubble image of Arp 321, also known as Hickson 40. This group of galaxies include three spiral galaxies, an elliptical galaxy, and a lenticular (lens-like) galaxy. Credit: NASA, ESA, STScI, Judy Schmidt Source

Image of Arp 122, also known as NGC 6040 and LEDA 59642, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Elliptical galaxies - Close to and perturbing spiral galaxies. Source

Gran Telescopio Canarias 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. Credit: GTC, IAC Source

Hubble Space Telescope image of Arp 26, also known as M101 or the Pinwheel Galaxy. This image shows a section of the galaxy, with over 3000 bright clusters of hot, young, blue stars. Credit: NASA, ESA Source

Image of Arp 300, also known as UGC 05028 and UGC 05029, from Halton Arp's Atlas of Peculiar Galaxies (1966). In the original catalog it was in the category: Double and multiple galaxies - Unclassified objects. Source