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Galaxy in the constellation Andromeda From Wikipedia, the free encyclopedia
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]
| NGC 759 | |
|---|---|
2MASS image of NGC 759. | |
| Observation data (J2000 epoch) | |
| Constellation | Andromeda |
| Right ascension | 01h 57m 50.3s[1] |
| Declination | 36° 20′ 35″[1] |
| Redshift | 0.015567[1] |
| Heliocentric radial velocity | 4667 km/s[1] |
| Distance | 230 Mly (70.4 Mpc)[1] |
| Group or cluster | Abell 262 |
| Apparent magnitude (V) | 13.3[1] |
| Characteristics | |
| Type | E[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] | |
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]
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]
NGC 759 contains 2.4 × 109 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]
NGC 759 has had one supernova,[18] SN 2002fb which was discovered on September 6, 2002. It was classified as a type Ia supernova.[19][20][21]
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