Wide-field view: The Fiddlehead Galaxy—NGC 772 in Aries | Digitized Sky Survey 2
A wide-field view of the area around NGC 772, also known as Arp 78 or the Fiddlehead Galaxy by the Digitized Sky Survey 2.
Close-up view of NGC 772 by the Gemini North telescope in Hawai‘i operated by the National Science Foundation's NOIRLab
A wide-field view of the area around NGC 772, also known as Arp 78 or the Fiddlehead Galaxy by the Digitized Sky Survey 2.
The Digitized Sky Survey (DSS) is a ground-based imaging survey of the entire sky in several colors of light produced by the Space Telescope Science Institute through its Guide Star Survey group.
See a close-up view of NGC 772 for comparison:
The overdeveloped spiral arm of the galaxy NGC 772 was created by tidal interactions with an unruly neighbor. It dominates this observation made by astronomers using the Gemini North telescope located near the summit of Maunakea in Hawai‘i. NGC 772’s peculiar appearance has earned it a place as the 78th entry in the Atlas of Peculiar Galaxies—a rogues’ gallery of weird and wonderful galaxy structures.
This impressive image shows the strangely lopsided spiral galaxy NGC 772. It lies over 100 million light-years from Earth in the constellation Aries. Captured by the Gemini North telescope in Hawai‘i, one half of the international Gemini Observatory, a Program of the National Science Foundation’s NOIRLab, the image shows NGC 772’s overdeveloped spiral arm. It stretches across toward the left-hand edge of the frame. This extra large arm is due to one of NGC 772’s unruly neighbors, the dwarf elliptical galaxy NGC 770. The tidal interactions between NGC 772 and its diminutive companion have distorted and stretched one of the spiral galaxy’s arms, giving it the lopsided appearance seen in this image.
NGC 772 also lacks a bright central bar. Other spiral galaxies, such as the Andromeda Galaxy or our own Milky Way, exhibit prominent central bars—large, linear structures composed of gas, dust, and countless stars. Without a bar, NGC 772’s spiral arms sweep out directly from the bright center of the galaxy.
The galaxy’s unusual appearance has earned it the distinction of appearing in the Atlas of Peculiar Galaxies, a careful curation by astronomer Halton Arp of some of the weird and wonderful galaxies populating the Universe. The 338 galaxies in the Atlas are a rogues’ gallery of strange and unusual galaxy shapes chosen to provide astronomers with a catalog of odd galaxy structures. Entries in the Atlas of Peculiar Galaxies include galaxies boasting trailing tidal tails, rings, jets, detached segments, and a host of other structural idiosyncrasies. NGC 772 is included as Arp 78.
Image Credits: STScI/DSS2/National Optical-Infrared Astronomy Research Laboratory (NOIRLab)/Association of Universities for Research in Astronomy (AURA)/National Science Foundation (NSF)
Release Dates: Jan. 23, 2025 & March 22, 2022
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