UGC 12591 explained
| UGC 12591 |
| Epoch: | J2000 |
| Constellation Name: | Pegasus |
| Ra: | [1] |
| Z: | 0.023179[2] |
| H Radial V: | 6949 ± 10 |
| Type: | S0/a |
| Mass: | [3] |
| Appmag B: | 13.90 |
| Size V: | 1.7 × 0.7 |
UGC 12591 is the third most massive known spiral galaxy, after ISOHDFS 27 and J2345-0449. It is located about 400 million light-years away from the Earth in the constellation Pegasus. In addition, it is the spiral galaxy with the highest known rotational speed[3] of about 500 km/s, almost twice that of our galaxy, the Milky Way. The high rotational speed means the galaxy must be very massive at the center; the galaxy has a mass estimated at 4 times that of the Milky Way,[4] making it the third of the most massive spiral galaxies known to date.
UGC 12591 is relatively isolated; the nearest galaxy to it is 3.55 million light-years (1.09 Mpc) away. However, its morphology suggests a merger or accretion event in its past: it is somewhat lenticular-like, with a central bulge and dust lanes reminiscent of the Sombrero Galaxy.[5]
Notes and References
- Web site: NED results for object UGC 12591. National Aeronautics and Space Administration / Infrared Processing and Analysis Center. 16 April 2017.
- Web site: NED results for object UGC 12591. National Aeronautics and Space Administration / Infrared Processing and Analysis Center. 16 April 2017.
- Giovanelli. R.. Haynes. M. P.. Rubin. V. C.. Ford. W. K. Jr.. UGC 12591 - The most rapidly rotating disk galaxy. The Astrophysical Journal Letters. 1 February 1986. 301. L7–L11. 10.1086/184613. 1986ApJ...301L...7G. 0004-637X. free.
- Web site: A remarkable galactic hybrid. ESA/Hubble. 16 April 2017.
- 10.1093/mnras/stac2683 . Hubble Space Telescope Captures UGC 12591: Bulge/Disc properties, star formation and 'missing baryons' census in a very massive and fast-spinning hybrid galaxy . 2022 . Ray . Shankar . Bagchi . Joydeep . Dhiwar . Suraj . Pandge . M. B. . Mirakhor . Mohammad . Walker . Stephen A. . Mukherjee . Dipanjan . Monthly Notices of the Royal Astronomical Society . 517 . 1 . 99–117 . 2022MNRAS.517...99R . 2203.02885 .
