Coordinates: Sky map 01h 52m 46.4467s, +36° 09′ 06.581″

NGC 708

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NGC 708
File:NGC 708 PanS.jpg
NGC 708 imaged by Pan-STARRS
Observation data (J2000 epoch)
ConstellationAndromeda
Right ascension01h 52m 46.4467s[1]
Declination+36° 09′ 06.581″[1]
Redshift0.015886[1]
Heliocentric radial velocity4762 km/s[1]
Distance232.05 ± 16.32 Mly (71.147 ± 5.005 Mpc)[1]
Group or clusterAbell 262
Apparent magnitude (V)13.70[1]
Characteristics
TypeE[1]
Size~200,000 ly (62 kpc) (estimated)[1]
Apparent size (V)3.0′ × 2.5′[1]
Other designations
B2 0149+35, HOLM 049A, UGC 1348, MCG +06-05-031, PGC 6962, CGCG 522-039[1]

NGC 708 is an elliptical galaxy located 240 million light-years away[1] in the constellation Andromeda. It was discovered by German-British astronomer William Herschel on September 21, 1786.[2] It is classified as a cD galaxy[3][4] and is the brightest member of Abell 262.[5][6] NGC 708 is a weak[7] FR I radio galaxy[8][9][10][11][12] and is also classified as a type 2 Seyfert galaxy.[7][13][1]

NGC 708 is surrounded by 4,700 globular clusters.[14]

Dust lane

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File:NGC 708 - HST- R814GB435.png
The dust lane in NGC 708 as imaged by the Hubble Space Telescope. NGC 705 can be seen at the lower right of the image.

Discovered in 1979 by Kotanyi et al., NGC 708 has a thin dust lane[15] with an irregular structure.[16][17][18][4] Besides the dust lane, there are also patches of dust that cross the nucleus.[16][17][18] These features are oriented nearly perpendicular to the radio emission of the galaxy.[19][20][12][7][5] The lane appears to be a nearly edge-on dust disk[21] with a length of 16,000 ly (5 kpc).[22]

The dust lane appears to have formed from a cooling accretion flow of intracluster medium (ICM) onto NGC 708.[22]

Supermassive black hole

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NGC 708 has a supermassive black hole with an estimated mass of (2.9×108 M☉) (108.46) M☉.[23][9]

The supermassive black hole is powering the radio jets and lobes in the galaxy.[9]

Radio morphology

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NGC 708 contains two radio jets[22] that are mildly bent[22][24] and extend into ''s'' shaped[7][11] double radio lobes[9][10][12][11] with a total length of 200,000 ly (60 kpc).[11]

Chandra observations have shown that the lobes have created a cavity in the intracluster medium of Abell 262.[10]

Possible interaction

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NGC 708 may be interacting with NGC 705 which lies about 67,000 ly (20.6 kpc) to the south-west.[20]

See also

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References

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