NGC 4550
| Galaxy NGC 4550 |
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| Image of the lenticular galaxy NGC 4550 with the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Virgin |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 12 h 35 m 30.6 s |
| declination | + 12 ° 13 ′ 15 ″ |
| Appearance | |
| Morphological type | SB0 ^ 0 ^: / LINER |
| Brightness (visual) | 11.7 mag |
| Brightness (B-band) | 12.6 mag |
| Angular expansion | 3.3 ′ × 0.9 ′ |
| Position angle | 178 ° |
| Surface brightness | 12.8 mag / arcmin² |
| Physical data | |
| Affiliation | Virgo cluster |
| Redshift | 0.001531 ± 0.000017 |
| Radial velocity | 459 ± 5 km / s |
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Stroke distance v rad / H 0 |
(18 ± 1) x 10 6 ly (5.59 ± 0.40) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | April 17, 1784 |
| Catalog names | |
| NGC 4550 • UGC 7757 • PGC 41943 • CGCG 070-182 • MCG + 02-32-147 • 2MASX 12353061 + 1213154 • VCC 1619 • GC 3095 • H I 36 • h 1343 • GALEX ASC J123530.60 + 121314.7 • LDCE 904 NED193 • HOLM 422A • VPC 1002 • EVCC 2175 | |
NGC 4550 is a lenticular galaxy with an active nucleus of the Hubble type SB0 in the constellation Virgo on the ecliptic . The center of NGC 4550 shows small amounts of molecular hydrogen and interstellar dust , the latter being concentrated in a disk around the center, in which star formation takes place, albeit slowly.
The galaxy is estimated to be 18 million light years from the Milky Way and about 15,000 light years across. It is listed as a member of the Virgo galaxy cluster under catalog number VCC 1619 and is one of the few galaxies with a large number of counter-rotating stars. The stars are distributed over two similarly large and similarly bright disks that are nested in one another, which is why it is assumed that this is the result of a galaxy merger.
Together with NGC 4551 , it forms the optical galaxy pair Holm 422 . In the same area of the sky are u. a. the galaxies NGC 4552 , IC 3509 , IC 3574 , IC 3586 .
The object was discovered on April 17, 1784 by the astronomer Wilhelm Herschel with the help of his 18.7 inch reflector telescope.
Web links
Individual evidence
- ↑ a b c d e NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b c d e SEDS : NGC 4550
- ↑ a b c T. Wiklind, C. Henkel: Molecular gas and dust in NGC 4550. A galaxy with two counterrotating stellar disks . In: Astronomy & Astrophysics . 375, No. 3, September 2001, pp. 797-804. arxiv : astro-ph / 0106286 . bibcode : 2001A & A ... 375..797W . doi : 10.1051 / 0004-6361: 20010860 .
- Jump up ↑ S. Mei, P. Côté, A. Jordán, EW Peng, JP Blakeslee, S. Piatek, S. Mei, D. Merritt: The ACS Virgo Cluster Survey. VI. Isophotal Analysis and the Structure of Early-Type Galaxies . In: The Astrophysical Journal Supplement Series . 164, No. 2, June 2006, pp. 334-434. arxiv : astro-ph / 0602297 . bibcode : 2006ApJS..164..334F . doi : 10.1086 / 501350 .
- ↑ a b A. F. Crocker, H. Jeong, S. Komugi, F. Combes, M. Bureau, LM Young, S. Yi: Molecular gas and star formation in the red-sequence counter-rotating disc galaxy NGC 4550 . In: Monthly Notices of the Royal Astronomical Society . 393, No. 4, June 2009, pp. 1255-1264. arxiv : 0812.0178 . bibcode : 2009MNRAS.393.1255C . doi : 10.1111 / j.1365-2966.2008.14295.x .
- ↑ Seligman