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Galaxy in the constellation Andromeda From Wikipedia, the free encyclopedia
NGC 708 is an elliptical galaxy located 240 million light-years away[2] in the constellation Andromeda and was discovered by astronomer William Herschel on September 21, 1786.[3] It is classified as a cD galaxy[4][5] and is the brightest member of Abell 262.[6][7] NGC 708 is a weak[8] FR I radio galaxy[9][10][11][12][13] and is also classified as a type 2 Seyfert galaxy.[8][14][2]
| NGC 708 | |
|---|---|
Pan-STARRS image of NGC 708 | |
| Observation data (J2000 epoch) | |
| Constellation | Andromeda |
| Right ascension | 01h 52m 46.5s[1] |
| Declination | 36° 09′ 07″[1] |
| Redshift | 0.016195[1] |
| Heliocentric radial velocity | 4,855 km/s[1] |
| Distance | 239 Mly (73.3 Mpc)[1] |
| Group or cluster | Abell 262 |
| Apparent magnitude (V) | 13.70[1] |
| Characteristics | |
| Type | E[1] |
| Size | ~200,000 ly (62 kpc) (estimated)[1] |
| Apparent size (V) | 3.0 x 2.5[1] |
| Other designations | |
| CGCG 522-39, MCG 6-5-31, PGC 6962, UGC 1348, B2 0149+35[1] | |
NGC 708 is surrounded by 4,700 globular clusters.[15]
Discovered in 1979 by Kotanyi et al., NGC 708 has a thin dust lane[16] with an irregular structure.[17][18][19][5] Besides the dust lane, there are also patches of dust that cross the nucleus.[17][18][19] These features are oriented nearly perpendicular to the radio emission of the galaxy.[20][21][13][8][6] The lane appears to be a nearly edge-on dust disk[22] with a length of 16,000 ly (5 kpc).[23]
The dust lane appears to have formed from a cooling accretion flow of intracluster medium (ICM) onto NGC 708.[23]
NGC 708 has a supermassive black hole with an estimated mass of (2.9×108 M☉) (108.46) M☉.[24][10]
The supermassive black hole is powering the radio jets and lobes in the galaxy.[10]
NGC 708 contains two radio jets[23] that are mildly bent[23][25] and extend into ''s'' shaped[8][12] double radio lobes[10][11][13][12] with a total length of 200,000 ly (60 kpc).[12]
Chandra observations have shown that the lobes have created a cavity in the intracluster medium of Abell 262.[11]
NGC 708 may be interacting with NGC 705 which lies about 67,000 ly (20.6 kpc) to the south-west.[21]
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