NGC 3393
| Galaxy NGC 3393 |
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|---|---|
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| Photo from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Water snake |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 10 h 48 m 23.4 s |
| declination | -25 ° 09 ′ 43 ″ |
| Appearance | |
| Morphological type | (R ') SB (s) from / Sy2 |
| Brightness (visual) | 12.2 mag |
| Brightness (B-band) | 13.1 mag |
| Angular expansion | 1.8 ′ × 1.5 ′ |
| Position angle | 48 ° |
| Surface brightness | 13.1 mag / arcmin² |
| Physical data | |
| Affiliation |
Abell 1060 LGG 223 |
| Redshift | 0.012509 ± 0.000017 |
| Radial velocity | (3750 ± 5) km / s |
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Stroke distance v rad / H 0 |
(159 ± 11) · 10 6 ly (48.7 ± 3.4) Mpc |
| history | |
| discovery | John Herschel |
| Discovery date | March 24, 1835 |
| Catalog names | |
| NGC 3393 • PGC 32300 • ESO 501-100 • MCG -04-26-11 • IRAS 10459-2453 • 2MASX J10482346-2509433 • SGC 104600-2453.8 • GC 2214 • h 3299 • AM 1045-245 • HIPASS J1048-25 LDCE • 0729 NED193 | |
NGC 3393 is a bar-spiral galaxy in the constellation Water Snake . It is an estimated 159 million light years from the Milky Way .
The object was discovered on March 24, 1835 by the British astronomer John Herschel . It is one of the so-called Seyfert galaxies , which are characterized by an unusually bright core. The spiral galaxy is also noticeable in that two bright arms of hot gas extend from its center, which together form the shape of an S.
Combined observations with the Hubble Space Telescope and the Chandra X-ray satellite show that the galaxy contains not just one, but two supermassive black holes at its center . This is the first pair of black holes to be found in a spiral galaxy similar to our Milky Way , and also the closest to Earth to date at a distance of 160 million light years . The two supermassive black holes orbit each other 490 light years apart and are believed to be the remnants of a galaxy merger over a billion years ago. The existence of a black hole in NGC 3393 had been known for a long time, but only a long-term image with the sensitive X-ray detectors of the Chandra satellite showed the neighboring second black hole.
Nearby galaxies
NGC 3393 is the brightest galaxy in the NGC 3393 group, which also includes NGC 3369 , NGC 3383, and ESO 501-086 . NGC 3463 was also proposed as a member of the group. The group is part of the Hydra Supercluster ( Abell 1060 ).
Web links
Individual evidence
- ↑ a b c d NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b c d e SEDS : NGC 3393
- ^ VizieR
- ↑ Seligman
- ↑ World of Physics: Spiral galaxy with double black hole discovered , September 2, 2011
- ↑ Dmitry Makarov, Igor Karachentsev: Galaxy groups and clouds in the local (z∼ 0.01) Universe . In: Monthly Notices of the Royal Astronomical Society . 412, No. 4, April 21, 2011, pp. 2498-2520. arxiv : 1011.6277 . bibcode : 2011MNRAS.412.2498M . doi : 10.1111 / j.1365-2966.2010.18071.x .
- ^ A. Garcia: General study of group membership. II - Determination of nearby groups . In: Astronomy and Astrophysics Supplement . 100, 1993, pp. 47-90. bibcode : 1993A & AS..100 ... 47G .
- ^ The Hydra Supercluster .