| 词条 | Arp 166 |
| 释义 |
| name = Arp 166 | image = NGC750 - NGC751 - SDSS DR14.png | caption = Arp 166 consists of NGC 750 (top) and NGC 751 (bottom) (SDSS) | epoch = J2000.0 | constellation name = Triangulum | ra = {{RA|01|57|32.00}} [1] | dec = {{DEC|+33|12|24.00}} [1] | z = 0.017529 | h_radial_v = {{nowrap|5255 km/s}} | dist_ly = 225 Mly [5] | appmag_b = 12.90 [1] | appmag_v = | type = Pair of galaxies E0+E | size_v = 2.5 x 1.7 | names = NGC 750, NGC 751 }}Arp 166 is a pair of interacting elliptical galaxies approximately 225 million light-years away from Earth in the constellation of Triangulum.[5] 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).[11] Observational historyArp 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.[11][5] 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.[11] The second galaxy from this pair, which is smaller and fainter than NGC 750, was catalogued as NGC 751.[11] Interacting galaxiesAt least 100,000,000 years have passed since the moment of the first strong tidal perturbation between these two galaxies.[16] Both galaxies are characterized by strong tidal interactions and distortions, and they are still in the process of efficient tidal interaction.[16] The distance between the centers of this pair is 21", or 10 kpc in projection.[18][16] Both galaxies have almost identical central radial velocities.[16] 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.[16] A large, diffuse tidal tail extends 20 arcsec (10 kpc) to the north-east of the pair.[16] See also
References1. ^1 2 3 {{Cite news|url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=arp+166&submit=submit+id|title=SIMBAD Astronomical Database|accessdate=March 7, 2019}} [1][2][3][4][5]2. ^1 2 3 4 {{cite web|title=Data for NGC 750/751|url=http://www.astronomy-mall.com/Adventures.In.Deep.Space/NGC%201%20-%20999%20(11-30-17).htm|website=www.astronomy-mall.com|accessdate=March 7, 2019}} 3. ^1 2 3 {{cite web|title=Focal Pointe Observatory|url=http://bf-astro.com/ngc750/arp166.htm|website=bf-astro.com|accessdate=March 7, 2019}} 4. ^1 {{cite book |last1=Sandage |first1=A. |last2=Bedke |first2=J. |date=1994 |title=The Carnegie Atlas of Galaxies. Volume I |publisher=Carnegie Institution of Washington |url=http://adsabs.harvard.edu/abs/1994cag..book.....S |access-date=March 7, 2019}} 5. ^1 2 3 4 5 6 {{cite journal |last=Madejsky |first=R. |date=1991 |title=Morphology and kinematics of the interacting elliptical galaxies NGC750 and NGC751 = ARP 166 - Velocity fields of tidally distorted elliptical galaxies |journal=Astronomy and Astrophysics |volume=247 |pages=348-356 |bibcode=1991A&A...247..348M}} }} External links
5 : Interacting galaxies|Triangulum (constellation)|Astronomical objects discovered in 1784|Discoveries by William Herschel|Arp objects |
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