| UGC 1840 | |
|---|---|
 UGC 1840 imaged by the Hubble Space Telescope | |
| Observation data | |
| Constellation | Andromeda |
| Right ascension | 02h 23m 08.4268s |
| Declination | +41° 22′ 20.031″ |
| Redshift | 0.018096 |
| Heliocentric radial velocity | 5,420 km/s |
| Distance | 258.5 Mly (79.1 Mpc) |
| Characteristics | |
| Type | Peculiar |
| Size | ~131,100 ly (40.20 kpc) (estimated) |
| Notable features | Collisional ring galaxy |
| Other designations | |
| IRAS 02200+4108, 2MASX J02231142+4122047, Arp 145, MCG +07-06-002, PGC 9060 & 9062, CGCG 538-056, HFLLZOA F264, V Zw 229 | |
UGC 1840, also known as Arp 145, are a pair of interacting galaxies located 250 million light-years away from the Solar System in the Andromeda constellation.[1] The earliest known reference to the pair of galaxies is in part 2 of the Morphological Catalogue of Galaxies, published in 1964, where it is listed as MCG +07-06-002.[2]
Made up of two galaxies, UGC 1840 NED01 (PGC 9060)[3] and UGC 1840 NED02 (PGC 9062),[4] the two galaxies had recently collided with each other[5] in which the elliptical galaxy has penetrated through the spiral galaxy's nucleus leaving a hole in its middle, thus forming a ring galaxy.[6][7] With a diameter of 1.3 arc minutes, close to 100,000 thousand light-years, they are roughly the same size as the Milky Way.[8][unreliable source?]
Both galaxies are listed as Arp 145 in the Atlas of Peculiar Galaxies which was created by Halton Arp.[9][10] They fall under the category of objects that have emanating material and both classified as galaxies that have ring systems.
- ^ "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-04-22.
- ^ Vorontsov-Vel'Yaminov, B. A.; Arkhipova, V. P. (1964). "Morphological catalogue of galaxies. Part 2". Morphological Catalogue of Galaxies. C02. Bibcode:1964MCG...C02....0V.
- ^ "NED Search Results for UGC 1840 NED02". ned.ipac.caltech.edu. Retrieved 2024-04-22.
- ^ "NED Search Results for UGC 1840 NED01". ned.ipac.caltech.edu. Retrieved 2024-04-22.
- ^ "Collisional Ring Galaxies - P.N. Appleton & C. Struck-Marcell". ned.ipac.caltech.edu. Retrieved 2024-04-22.
- ^ "Mantrap Skies Astronomical Image Catalog: ARP145". images.mantrapskies.com. Retrieved 2024-04-22.
- ^ Chatterjee, T. K. (1984-11-01). "The Formation of Ring Galaxies". Astrophysics and Space Science. 106 (2): 309–339. Bibcode:1984Ap&SS.106..309C. doi:10.1007/BF00650358. ISSN 0004-640X.
- ^ Iovene, Salvatore. "UGC1840 (Arp 145) Irregular galaxy". AstroBin. Retrieved 2024-04-22.
- ^ "David's Astronomy - ARP Peculiar Galaxy Objects". www.astro-richweb.net. Retrieved 2024-04-22.
- ^ Arp, Halton (1966). "Atlas of Peculiar Galaxies". The Astrophysical Journal Supplement Series. 14: 1. Bibcode:1966ApJS...14....1A. doi:10.1086/190147.