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NGC 7771 (Interacting Galaxy)


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NGC 7771
Interacting Galaxy (相互作用銀河)
Gx SBa


別名 (Other names)
UGC 12812, Mrk 9006, KPG 592B, UGC 12815, PGC 72638, MCG 3-60-35


明るさ (Brightness)

12.1等級


星座 (Constellation)
ペガスス座 (Peg) (Pegasus)

距離 (Distance)
2億光年 (200 million light-years)

NGC 7771 is an interacting galaxy located 200 million light years from the Earth in the constellation Pegasus.

NGC 7771 (Interacting Galaxy) : Picture

Dust and the NGC 7771 Group
Dust and the NGC 7771 Group
(C) Ken Crawford (Rancho Del Sol Observatory)
Galaxies of the NGC 7771 Group are featured in this intriguing skyscape. Some 200 million light-years distant toward the constellation Pegasus, NGC 7771 is the large, edge-on spiral near center, about 75,000 light-years across, with two smaller galaxies just below it. Large spiral NGC 7769 is seen face-on to the right. Galaxies of the NGC 7771 group are interacting, making repeated close passages that will ultimately result in galaxy-galaxy mergers on a cosmic timescale. The interactions can be traced by galaxy distortions and faint streams of stars created by gravitational tides. But a clear view of the galaxy group is difficult to come by, as the deep image also reveals extensive clouds of foreground dust sweeping across the field. The dim, dusty nebulae reflect starlight from our own Milky Way Galaxy and lie only a few hundred light-years above the galactic plane.

NGC 7771 Galaxy Group
NGC 7771 Galaxy Group
(C) Kent Biggs
NGC 7771 Galaxy Group
Slide your cursor over the image to identify three members of this intriguing gathering of galaxies. Known as the NGC 7771 Group, they lie almost 200 million light-years away toward the high flying constellation Pegasus. The largest galaxy, barred spiral NGC 7771, is itself about 75,000 light-years across, but will someday find itself part of a larger galaxy still. As the galaxies of the group make repeated close passages, they will finally merge into one very large galaxy. Played out over hundreds of millions of years, the process is understood to be a normal part of the evolution of galaxies, including our own Milky Way.

Hubble Interacting Galaxy UGC 12812
Hubble Interacting Galaxy UGC 12812
(C) NASA/ESA
UGC 12812, also known as Markarian 331, is a spiral galaxy with no obvious tidal tails. It is located in the lower part of the Hubble image. Two neighboring blue galaxies are seen at the top of the frame. The galaxy at the very top is embellished by a remarkable number of blue star knots. Observations point to the presence of a giant black hole anchored at the center of the bright core of UGC 12812. The galaxy produces 80 solar masses of new stars on average every year. It is an open question whether Markarian 331 is actually a merging system or whether its infrared brightness stems from another process. UGC 12812 is located in the constellation of Pegasus, about 250 million light-years away from Earth.

NGC 7771 NGC 7771
NGC 7771
(C) Ken Crawford
NGC 7771
(C) Kent Biggs
UGC 12812
UGC 12812
(C) NASA
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