ESO 198-13
| ESO 198-13 | |
|---|---|
 Ring galaxy ESO 198-13. | |
| Observation data (J2000 epoch) | |
| Constellation | Eridanus |
| Right ascension | 02h 29m 16.1s[1] |
| Declination | −48° 29′ 29″[1] |
| Redshift | 0.018186/5452 km/s[1] |
| Distance | 237,147,400 ly |
| Apparent magnitude (V) | 13.64 |
| Characteristics | |
| Type | (R')SA(r)ab[1] |
| Size | ~162,773 ly (estimated) |
| Apparent size (V) | 1.7' x 1.2[1] |
| Notable features | Multiple-ringed Hoag-type galaxy |
| Other designations | |
| PGC 9463 [1] | |
ESO 198-13 is a ring galaxy with multiple ring-like structures[2] located about 240 million light-years away[3] in the constellation Eridanus.[4]
Physical characteristics[edit]
This galaxy has three ring structures. There is a small bright inner ring located close to the nucleus. This feature has been interpreted as a nuclear ring due to being similar to the nuclear rings in a barred spiral galaxy (e.g. NGC 1512, NGC 4314). Also this ring has a diameter of 15,527.12 light-years (4.76 kpc) which is larger than the average diameter of a nuclear ring (4,893 light-years/1.5 kpc). Surrounding the nuclear ring, a flocculent inner ring with a diameter of 54,801.6 light-years (16.8 kpc) can be found. It appears to be made of a very tightly wound spiral arm. It also could be a superposition of two rings offset from each other. Outside of the flocculent inner ring, there is a very large and faint outer ring with a diameter of 162,773.8 light-years (49.9 kpc).[2]
See also[edit]
References[edit]
- ^ a b c d e f "NASA/IPAC Extragalactic Database". Results for ESO 198-13. Retrieved 2017-07-27.
- ^ a b Grouchy, R. D.; Buta, R. J; Salo, H.; Laurikainen, E. (3 May 2010). "Ring Star Formation Rates in Barred and Nonbarred Galaxies". The Astronomical Journal. 139 (6): 2465–2493. arXiv:1004.5063. Bibcode:2010AJ....139.2465G. doi:10.1088/0004-6256/139/6/2465. S2CID 119099302.
- ^ "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2017-07-27.
- ^ "Principal Galaxy Catalog (PGC) Objects 9000 - 9499". cseligman.com. Retrieved 2017-07-27.
External links[edit]
- ESO 198-13 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- The de Vaucouleurs Atlas of Galaxies entry on ESO 198-13
