NGC 759

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NGC 759
File:2MASS NGC 759.jpg
2MASS image of NGC 759.
Observation data (J2000 epoch)
ConstellationAndromeda
Right ascension01h 57m 50.3s[1]
Declination36° 20′ 35″[1]
Redshift0.015567[1]
Heliocentric radial velocity4667 km/s[1]
Distance230 Mly (70.4 Mpc)[1]
Group or clusterAbell 262
Apparent magnitude (V)13.3[1]
Characteristics
TypeE[1]
Size~110,000 ly (33 kpc) (estimated)[1]
Apparent size (V)1.6 × 1.4[1]
Other designations
MCG 6-5-67, PGC 7397, UGC 1440[1]

NGC 759 is an elliptical galaxy located 230 million light-years away[2] in the constellation Andromeda. NGC 759 was discovered by astronomer by Heinrich d'Arrest on September 17, 1865.[3] It is a member of Abell 262.[4][5][6][7][8]

Despite being classified as a radio galaxy,[9][10][11][12][13] the radio emission in NGC 759 could be due to star formation rather than an active galactic nucleus.[12][13]

Dust disk

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The central region of NGC 759 harbors a face-on dust disk with tightly wound spiral structure. The disk has a diameter of 11,000 ly (3.4 kpc).[14] The dust disk also contains a smaller circumnuclear molecular gas ring that has star formation in H II regions.[15][16] These features may be the result of a merger of gas-rich disk galaxies[15][16][17] or by the accretion of gas-rich material. In either scenario, the gas would have lost momentum and fallen to the center of the galaxy to produce the disk and current star formation.[17] However, Vlasyuk et al. suggests that the disk and the smaller circumnuclear molecular gas ring with star formation inside the main disk formed from a tidal encounter between NGC 759 and a large spiral galaxy which was accompanied by a substantial gas accretion.[16]

File:NGC 759 -HST-622w.png
The dust disk in NGC 759 as imaged by the Hubble Space Telescope

Molecular gas

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NGC 759 contains 2.4 billion M☉ of molecular gas. Most of the gas is concentrated in a circumnuclear molecular gas ring with a diameter of 4,200 ly (1.3 kpc).[15] The gas may be the result of the same merger event that produced the circumnuclear molecular gas ring and the main disk.[16][15][17]

SN 2002fb

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One supernova has been observed in NGC 759,[18] SN 2002fb, which was discovered on September 6, 2002. It was classified as a type Ia supernova.[19][20][21]

See also

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References

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