Английская Википедия:Arp 166
Шаблон:Short description Шаблон:Infobox Galaxy
Arp 166 is a pair of interacting elliptical galaxies approximately 225 million light-years away from Earth in the constellation of Triangulum.[1][2] The two galaxies, NGC 750 and NGC 751, are listed together as Arp 166 in the Atlas of Peculiar Galaxies (in the category Galaxies with diffuse filaments).[3]
Observational history
Arp 166 was discovered by German-born British astronomer William Herschel on September 12, 1784, but he did not resolve this close pair of galaxies, therefore he described it as a single object NGC 750.[3][2]
Arp 166 was first seen as a double by Irish engineer and astronomer Bindon Stoney on October 11, 1850, who used Lord Rosse's 72" telescope.[3] The second galaxy from this pair, which is smaller and fainter than NGC 750, was catalogued as NGC 751.[3]
Interacting galaxies
At least 100,000,000 years have passed since the moment of the first strong tidal perturbation between these two galaxies.[4] Both galaxies are characterized by strong tidal interactions and distortions, and they are still in the process of efficient tidal interaction.[4]
The distance between the centers of this pair is 21", or 10 kpc in projection.[5][4] Both galaxies have almost identical central radial velocities.[4] While NGC 750 exhibits nearly flat radial velocity curves, the radial velocity curves of NGC 751 are characterized by large variations of more than 100 km s−1 along the slit.[4]
A large, diffuse tidal tail extends 20 arcsec (10 kpc) to the north-east of the pair.[4]
References
External links
Шаблон:Sky Шаблон:Stars of Triangulum
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- Английская Википедия
- Interacting galaxies
- Triangulum
- Astronomical objects discovered in 1784
- Discoveries by William Herschel
- Arp objects
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- Страницы с телепортом
- Википедия
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- Статья из Английской Википедии
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