Astronomy:Arp 143
| Arp 143 | |
|---|---|
| File:290px | |
| Observation data (Epoch ) | |
| Constellation(s) | Lynx |
| Right ascension | 07h 46m 57s |
| Declination | 39° 00′ 51″ |
| Brightest member | NGC 2445 |
| Number of galaxies | 2 |
| Redshift | 0.01295 |
| Distance (co-moving) | 191 million light-years (59×106 pc) |
Arp 143, also known as VV 117, is a pair of interacting galaxies, NGC 2444 and NGC 2445, found in the Lynx constellation.[1] It is one of the few ring galaxy systems in the Atlas of Peculiar Galaxies.[2] It is believed that NGC 2444 and NGC 2445 have passed through each other, causing an increase in star formation in NGC 2445.[1] Unlike NGC 2445, NGC 2444 is not experiencing any new star birth due to NGC 2444 having lost its gas long before the collision.[3]
Observations
Arp 143 was discovered by French astronomer Édouard Stephan on 18 January 1877 using the 31-inch Foucault reflector telescope at the Marseille Observatory.[4]
Arp 143 is composed of NGC 2444 and NGC 2445.[1] The latter is a very distorted ring galaxy, taking a trapezoidal shape instead of a more circular one.[2] This is a result of gravity from NGC 2444 pulling on NGC 2445.[1] The cluster has complex radio emissions that may be caused by star formation or a black hole,[3] with the radio emissions being concentrated in the cores, a northwestern region of NGC 2445 extending to NGC 2444, and the southern and eastern parts of NGC 2445's ring.[2] The northwestern region of NGC 2445 also has a stronger-than-normal magnetic field compared to most spiral galaxies.[2] The stars of the ring are around 50–100 million years old.[5]
The ring of Arp 143 has a radius of 10 kiloparsecs (33,000 ly).[6] It is composed of stellar knots. The stellar ages within the ring gets lower the further out, which corresponds with a galactic collision.[6] The ring is not centered, indicating a non-symmetrical collision.[6]
NGC 2444 pulls on NGC 2445, creating a tidal tail.[1][6] The tail is approximately 240 kiloparsecs (780,000 ly) long.[7] The stream of stars that make up the tail are slowly being left behind as NGC 2445 continues to slowly pull away from NGC 2444.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "Arp 143" (in en-US). 2022-02-22. https://science.nasa.gov/asset/hubble/arp-143/.
- ↑ 2.0 2.1 2.2 2.3 Nikiel-Wroczyński, Błażej; Jamrozy, Marak; Soida, Marian; Urbanik, Marek (2014-08-14). "Multiwavelength study of the radio emission from a tight galaxy pair Arp 143". Monthly Notices of the Royal Astronomical Society 444 (2): 1729–1737. doi:10.1093/mnras/stu1475.
- ↑ 3.0 3.1 3.2 information@eso.org. "Hubble Looks at a ‘Space Triangle’ Spawned by a Galaxy Collision" (in en). https://www.esahubble.org/news/heic2201/.
- ↑ "Pair of Galaxies NGC 2444/5 | Deep⋆Sky Corner" (in en). https://www.deepskycorner.ch/obj/ngc2444.en.php.
- ↑ Gamillo, Elizabeth. "Hubble Space Telescope Captures Galaxies Caught in Triangular Tug-of-War" (in en). https://www.smithsonianmag.com/smart-news/space-telescope-captures-a-glittering-triangular-tug-of-war-180979640/.
- ↑ 6.0 6.1 6.2 6.3 Chow-Martínez, M; Robleto-Orús, A; Mayya, Y D; Torres-Papaqui, J P; Ortega-Minakata, R A; Castro-Hidalgo, D F; Caretta, C A; Trejo-Alonso, J J et al. (2026-04-21). "Integral field spectroscopy of collisional ring galaxies – I. Stellar population analysis". Monthly Notices of the Royal Astronomical Society 547 (4). doi:10.1093/mnras/stag511. ISSN 0035-8711.
- ↑ "[21.03 Tidal Dwarf Galaxy Candidates in Arp 143's Plume"]. https://aasarchives.blob.core.windows.net/archives/BAAS/v33n4/aas199/683.htm.
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