#arpgalaxy — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #arpgalaxy, aggregated by home.social.
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Image of Arp 290, also known as IC 195 and IC 196, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Double and multiple galaxies - Wind effects. This interacting galaxy pair consists of a larger barred spiral (IC 196, top) and a smaller intermediate spiral (IC 195, bottom).
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Gemini North image of Arp 336, also known as NGC 2685 or the Helix Galaxy.
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. This structure likely formed through an interaction which captured material from another galaxy.
Credit: International Gemini Observatory, NOIRLab, NSF, AURA, L. Bassino
Source: https://noirlab.edu/public/images/iotw2415a/ -
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/ -
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 Space Telescope image of Arp 12, also known as NGC 2608.
NGC 2608 is a barred spiral galaxy. Its arms are peppered by blue star clusters and red star forming regions. The arms are anchored together by the prominent horizontal central bar of the galaxy, which is crossed by brown dust lanes.
Credit: ESA, NASA, A. Riess et al.
Source: https://esahubble.org/images/potw2023 -
Chandra image of Arp 16, also known as M66.
This X-ray image of M66 shows the hottest gas in the galaxy as a diffuse blue glow, found in the galaxy’s core, bar, and innermost spiral arms. The bright X-ray source at the center is likely powered by material falling onto a supermassive black hole.
Credit: NASA, CXC, Ohio State Univ., C.Grier et al.
Source: https://chandra.harvard.edu/photo/2012/ngc3627/ -
Subaru Telescope and Blackbird Observatory image of Arp 189, also known as NGC 4651 or the Umbrella Galaxy.
The galaxy gets its nickname from the parasol-shaped feature to the left. It is a stellar stream made of debris from a tiny galaxy, only a fiftieth its size, that was shredded apart by gravity as it fell into its larger companion.
Credit: NAOJ, R. Jay GaBany
Source: https://subarutelescope.org/en/results/2014/07/01/2384.html -
Composite image of Arp 16, also known as M66.
Includes X-ray data from Chandra (blue), infrared from Spitzer (red), and visible light from Hubble and the Very Large Telescope (yellow). The inset shows a bright central X-ray source, likely material falling onto a supermassive black hole.
Credit: NASA, STScI, JPL-Caltech, ESO, WFI, CXC, Ohio State Univ., C.Grier et al
Source: https://chandra.harvard.edu/photo/2012/ngc3627/ -
MegaCam Canada-France-Hawaii Telescope image of Arp 227, also known as NGC 470 and NGC 474.
The large lenticular galaxy (NGC 474, left) is interacting with a smaller companion spiral galaxy (NGC 470, right). NGC 474's spectacular shells and tidal tails may be the result of a past merger with a smaller galaxy.
Credit: Canada-France-Hawaii Telescope, Coelum
Source: https://www.cfht.hawaii.edu/hawaiianstarlight/AIOM/English/CFHT-Coelum-AIOM-Jul2013.html -
Canada-France-Hawaii Telescope image of Arp 189, also known as NGC 4651 or the Umbrella Galaxy.
The galaxy gets its nickname from the parasol-shaped feature to the right. It is a stellar stream made of debris from the remains of a tiny galaxy that was ripped apart by the large spiral galaxy.
Credit: Canada-France-Hawaii Telescope, Coelum
Source: https://www.cfht.hawaii.edu/HawaiianStarlight/AIOM/English/CFHT-Coelum-AIOM-Oct2025.html