NGC 1600 explained

NGC 1600
Epoch:J2000
Ra:[1]
Constellation Name:Eridanus
Dist Ly:45770abbr=onNaNabbr=on
Z:0.015614
H Radial V:4681 km/s
Group Cluster:group
Type:E3 or E4 [2]
Mass Light Ratio:10.58
Appmag V:11.93
Names:LEDA 15406,[3] PGC 15406
Size V:2.5 x 1.7 arcminutes

NGC 1600 is an elliptical galaxy in the constellation Eridanus, 149abbr=onNaNabbr=on away from Earth.[1]

Cluster membership

Often described as being an isolated early-type galaxy, it is known to have at least 30 fainter satellite galaxies, including NGC 1601 and NGC 1603.[4] The galaxy has been observed to have boxy isophotes and little rotation. The presence of H-alpha indicates possible ongoing star formation, and the galaxy is a known source of X-ray emissions. It is believed that NGC 1600 is the product of a galaxy merger which took place over 4 Gyr ago. The age of the galaxy is estimated at 4.6–8.8 Gyr.

The system consisting of NGC 1600 and its surrounding galaxies shares some similarities to fossil galaxy groups, but is not exactly the same.[4] For example, it has an unusually high concentration of dark matter, similar to fossil groups. However, the X-ray luminosity is less than erg s−1, the threshold for fossil groups.[5]

Supermassive black hole

NGC 1600 has a diffuse distribution of stars near its center, caused by the influence of the galaxy's central black hole.[6] Despite NGC 1600 being of typical size, the supermassive black hole at its center is unusually large, with a mass of 17 billion solar masses, making it one of the largest known.[7] At the time of the determination of the size of the black hole, in 2016, it was found to be unusual in its location in relation to the galaxy population of the region. Previously, extremely large black holes were only found in the hearts of large dense rich clusters, the galaxy group for which NGC 1600 is found is only an average galaxy group and not a rich cluster. This discovery could signify previously unknown populations of very large black holes, and that black hole growth models may be incorrect or incomplete.[8]

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 1600 . 2016-04-06 .
  2. Matthias . Michael . Gerhard . Ortwin . 1999-12-11 . Dynamics of the boxy elliptical galaxy NGC 1600 . . 310 . 3 . 879–891 . 10.1046/j.1365-8711.1999.03022.x . free . astro-ph/9901036 . 1999MNRAS.310..879M . 14530337 .
  3. Web site: NGC 1600 – Galaxy in Group of Galaxies . .
  4. Smith. Rodney M. . Martínez. Vicent J. . Fernández-Soto. Alberto . Ballesteros. Fernando J. . Ortiz-Gil. Amelia . 2008-05-20. NGC 1600: Cluster or Field Elliptical?. The Astrophysical Journal. 679. 420. 10.1086/587454. 0802.1846 . 2008ApJ...679..420S . 420–427. 16331294 .
  5. 10.1093/mnras/stab3139. 2110.13931. The unusually high dark matter concentration of the galaxy group NGC 1600. 2021. Runge. J.. Walker. S. A.. Mirakhor. M. S.. Monthly Notices of the Royal Astronomical Society. 509 . 2 . 2647–2653 . free .
  6. Thomas. Jens . Chung-Pei . Ma. Chung-Pei Ma. McConnell. Nicholas J. . Greene. Jenny E. . Blakeslee. John P.. Janish. Ryan . 2016-04-06. A 17-billion-solar-mass black hole in a group galaxy with a diffuse core. Nature. 10.1038/nature17197. 0028-0836. 1604.01400 . 2016Natur.532..340T . 532 . 7599 . 340–342 . 27049949. 4454301 .
  7. Web site: Supersized black hole discovery forces universal rethink . 2016-04-06 . . https://web.archive.org/web/20221229011320/https://www.theguardian.com/science/2016/apr/06/supersized-black-hole-discovery-forces-universal-rethink . 2022-12-29 . live .
  8. News: Humongous black hole catches astronomers totally off guard . . Sarah Lewin . . 6 April 2016 .