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Arp 166 is a pair of interacting elliptical galaxies approximately 225 million light-years away from Earth in the constellation of Triangulum.[2][3] 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).[4]

Arp 166
Arp 166 consists of NGC 750 (top) and NGC 751 (bottom) (SDSS)
Observation data (J2000.0 epoch)
ConstellationTriangulum
Right ascension01h 57m 32.00s [1]
Declination+33° 12′ 24.00″ [1]
Redshift0.017529 [2]
Helio radial velocity5255 km/s [2]
Distance225 Mly[3]
Apparent magnitude (B)12.90 [1]
Characteristics
TypePair of galaxies E0+E [2]
Apparent size (V)2.5 x 1.7 [2]
Other designations
NGC 750, NGC 751

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.[4][3]

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.[4] The second galaxy from this pair, which is smaller and fainter than NGC 750, was catalogued as NGC 751.[4]


Interacting galaxies


At least 100,000,000 years have passed since the moment of the first strong tidal perturbation between these two galaxies.[5] Both galaxies are characterized by strong tidal interactions and distortions, and they are still in the process of efficient tidal interaction.[5]

The distance between the centers of this pair is 21", or 10 kpc in projection.[6][5] Both galaxies have almost identical central radial velocities.[5] 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.[5]

A large, diffuse tidal tail extends 20 arcsec (10 kpc) to the north-east of the pair.[5]


References


  1. "SIMBAD Astronomical Database". Retrieved March 7, 2019.
  2. "NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved March 7, 2019.
  3. "Focal Pointe Observatory". bf-astro.com. Retrieved March 7, 2019.
  4. "Data for NGC 750/751". www.astronomy-mall.com. Retrieved March 7, 2019.
  5. Madejsky, R. (1991). "Morphology and kinematics of the interacting elliptical galaxies NGC750 and NGC751 = ARP 166 - Velocity fields of tidally distorted elliptical galaxies". Astronomy and Astrophysics. 247: 348–356. Bibcode:1991A&A...247..348M.
  6. Sandage, A.; Bedke, J. (1994). The Carnegie Atlas of Galaxies. Volume I. Carnegie Institution of Washington. Bibcode:1994cag..book.....S.



На других языках

[de] NGC 750/751

NGC 750/751 = Arp 166 ist ein interagierendes Galaxienpaar im Sternbild Triangulum am nördlichen Fixsternhimmel. Das Galaxienpaar ist etwa 237 Millionen Lichtjahre von der Milchstraße entfernt. Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Diese Galaxie gehört zu der Klasse Galaxien mit diffusen Filamenten.
- [en] Arp 166


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