#arpgalaxy — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #arpgalaxy, aggregated by home.social.
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Gemini North 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 (out of frame). The interactions left NGC 772's bottom arm elongated and asymmetrical.
Credit: International Gemini Observatory, NOIRLab, NSF, AURA
Source: https://noirlab.edu/public/images/noirlab2209a/ -
Hubble image of Arp 297, also known as NGC 5754 and NGC 5752.
NGC 5754, the large spiral galaxy, has kinked arms just beyond its inner ring. They are a result of interactions with its companion galaxy, NGC 5752, the smaller galaxy at bottom left. The same interactions triggered a starburst in NGC 5752, creating bright star clusters around its core.
Credit: NASA, ESA, the Hubble Heritage team, W. Keel
Source: https://science.nasa.gov/asset/hubble/hubble-interacting-galaxy-ngc-5754/ -
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 -
Spitzer image of Arp 16, also known as M66.
In this infrared image of M66 from the Spitzer Infrared Nearby Galaxy Survey (SINGS), we see a stark contrast between the blue core and bar with a concentration of blue older stars, and the pink bar ends and spiral arms that show dust heated by actively forming stars.
Credit: NASA/JPL-Caltech/R. Kennicutt (University of Arizona) and the SINGS Team
Source: https://www.spitzer.caltech.edu/image/sig05-016-ngc-3627-m66 -
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 -
Burrell Schmidt telescope image of Arp 16, also known as M66.
M66 is a member of the Leo Triplet. This small group of galaxies consists of the edge-on spiral galaxy NGC 3628 at upper left, and the nearly face-on spirals M66 at lower left and M65 at lower right.
Credit: REU program, NOIRLab, NSF, AURA
Source: https://noirlab.edu/public/images/noao-m65a66/ -
Image of Arp 84, also known as NGC 5394 and NGC 5395, 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. This interacting pair is sometimes called the "Heron Galaxy". The larger spiral, NGC 5395 forms the body of the heron and the smaller, two-armed NGC 5394 forms its neck, head, and beak.
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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/ -
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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Image of Arp 142, also known as NGC 2936, NGC 2937, and UGC 5130, or the Penguin and the Egg, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Elliptical galaxies - Emanating material. The Penguin is a spiral galaxy whose shape has been distorted by the gravity of the elliptical Egg galaxy. The two completed a close pass between 25 and 75 million years ago.
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Hubble image of Arp 195, also known as UGC 4653.
This image of three interacting galaxies is from the Establishing HST's Low Redshift Archive of Interacting Systems snapshot program. These programs fill in gaps in Hubble's schedule (2-3 percent of the available time) with short observations.
In this image, the luminosity is from Hubble ACS/WFC observations, and color is from DECam and SDSS.
Credit: ESA, NASA, J. Dalcanton
Source: https://esahubble.org/images/potw2130a/ -
Hubble image of Arp 298, also known as NGC 7469 and IC 5283.
NGC 7469, a face-on spiral galaxy, and its companion galaxy IC 5283, seen to the upper right, form an interacting pair.
IC 5283 shows signs of significant gravitational perturbations caused by its companion, including a tidal tail dotted with young, blue star clusters that trails off to the right.
Credit: ESA, NASA, A. Evans, R. Chandar
Source: https://esahubble.org/images/potw2208a/ -
Image of Arp 85, also known as the Whirlpool Galaxy or M51, 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. Halton Arp mistakenly believed that the smaller galaxy, NGC 5195, was being ejected from the Whirlpool. In reality, the two galaxies are in the process of merging.
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Legacy Surveys image of Arp 11, also known as UGC 717.
UGC 717 is the large spiral galaxy in the lower right. The large spiral in the upper left is UGC 719.
Credit: Legacy Surveys, D. Lang, NERSC, Meli thev, Wikimedia Commons
Source: https://commons.wikimedia.org/wiki/File:Arp_11_legacy_dr10.jpg -
Image of Arp 5, also known as NGC 3664, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - Low surface brightness. Similar to the Large Magellanic Cloud, NGC 3664 is a barred Magellanic spiral galaxy, with a long, single spiral arm and prominent bar. It is interacting with a small dwarf galaxy, out of frame.
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Hubble image of Arp 204, also known as UGC 8454.
This is likely at least two interacting galaxies connected by a long tidal tail. Encounters between the galaxies have distorted their shapes, making a somewhat puzzling mess.
Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt
Source: https://www.flickr.com/photos/geckzilla/48370370147/in/album-72157629527315128 -
Hubble image of Arp 300, also known as UGC 05028 and UGC 05029.
UGC 05028 (the smaller spiral galaxy) and UGC 05029 (the larger spiral) form an interacting pair.
Interactions with its companion likely gave UGC 05028 its asymmetric structure. The bright knot in the bottom of UGC 05028 may be yet another small galaxy that is in the process of merging.
Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt, PanSTARRS
Source: https://www.flickr.com/photos/geckzilla/48172158187/ -
Composite image of Arp 298, also known as NGC 7469 and IC 5283.
X-rays from Chandra (purple) are overlaid on a Hubble visible/infrared and JWST infrared image of NGC 7469.
Large, red diffraction spikes and X-ray light near the center signal the presence of a supermassive black hole.
Credit: NASA, CXC, X. Xu; NASA, ESA, UVA, NRAO, A. S. Evans, Hubble Heritage team; NASA, ESA, CSA, L. Armus, A. S. Evans; J. Major
Source: https://chandra.harvard.edu/photo/2024/25th/more.html -
Dark Energy Survey image of Arp 227, also known as NGC 470 and NGC 474.
This interacting galaxy pair with a spiral galaxy (NGC 470, left) and a lenticular galaxy (NGC 474, right), may have once been a triple system. The spectacular shells around NGC 474 could be the result of a merger of a small spiral galaxy an a large elliptical galaxy.
Credit: DES, DOE, Fermilab, NCSA & CTIO, NOIRLab, NSF, AURA
Source: https://noirlab.edu/public/images/noirlab2106a/ -
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/ -
Hubble and Chandra image of Arp 147, also known as IC 298.
The galaxy to the left likely crashed through the galaxy on the right, creating a ring and triggering a burst of star formation.
The pink dots are Chandra data. The points in the ring are so bright that they must be black holes with masses about ten times the Sun, pulling matter from companions.
Credit: NASA, STScI, CXC, MIT, S.Rappaport et al.
Source: https://chandra.harvard.edu/photo/2011/arp147/ -
Image of Arp 81, also known as NGC 6621 and NGC 6622, 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. The galaxies NGC 6621 (bottom) and NGC 6622 (top) are about mid way through a merger. A recent encounter pulled a long tail out of NGC 6621 that wraps behind the galaxy.
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Image of Arp 4, from the Atlas of Peculiar Galaxies by Halton Arp (1966).
In the original catalog, it was in the category: Spiral galaxies - Low surface brightness. This image contains two galaxies, a larger irregular galaxy, Arp 4, and a small spiral galaxy PGC 6629.
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Hubble image of Arp 256.
The blue dots in this pair of distorted spiral galaxies are clusters of newly-formed, hot, massive stars. The formation of these star clusters was triggered by a recent close interaction of the two galaxies.
Credit: ESA, NASA
Source: https://esahubble.org/images/heic1805a/ -
Hubble and Spitzer image of Arp 148, also known as Mayall's Object.
The thick clouds of dusty material in the edge-on galaxy (left) glow brightly in the infrared wavelengths of light seen by Spitzer (red), while starlight dominates the visible light from Hubble (blue and green).
The edge-on galaxy likely crashed through its companion, creating a ring and triggering a burst of star formation.
Credit: NASA, JPL-Caltech, STScI
Source: https://www.spitzer.caltech.edu/image/ssc2021-06b-arp-148-visible-infrared -
ALMA image of Arp 16, also known as M66.
This image of M66, shows the location of cold clouds of molecular gas. It’s in these cold, dusty clouds that new stars form.
It was taken as part of the PHANGS program, to help understand how the small-scale details of how stars form influence the large-scale structures of galaxies.Credit: ESO, ALMA (ESO/NAOJ/NRAO), PHANGS
Source: https://www.eso.org/public/images/ngc3627-alma-cc/ -
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/ -
Hubble Space Telescope image of Arp 16, also known as M66.
M66 is about 37 million light-years (11.3 Mpc) away.
It was discovered by Charles Messier on 1 March 1780, object 66 in his catalog of “fuzzy things in the night sky that are not comets." He described it as "very long and very faint."Credit: NASA, ESA, STScI
Source: https://webbtelescope.org/contents/media/images/2024/105/01HMA6P3V363GW0EA0347CR6HV -
Hubble image of Arp 283, also known as NGC 2798 and NGC 2799.
The left galaxy in this interacting pair, NGC 2799, is viewed edge-on. A bridge of star forming regions appears to connect it to its companion on the right, NGC 2798. NGC 2798 has two broad smooth spiral arms or tails without obvious clumps, made of mostly older, yellow stars.
Credit: ESA, NASA, SDSS, J. Dalcanton, J. Schmidt
Source: https://esahubble.org/images/potw2042a/ -
Spitzer image of Arp 302, also known as UGC 9618 or VV 340.
Arp 302 is unusually bright in infrared light. It doesn't seem to be forming stars particularly efficiently, the case for most luminous infrared galaxies. Instead, the galaxy has an unusually large amount of gas, converted into stars at a normal rate.
The effect is the same, a large number of young stars to heat the surrounding gas.
Credit: NASA, JPL-Caltech
Source: https://www.spitzer.caltech.edu/image/ssc2019-03c-galaxy-merger-arp-302