Reticulum II-dwergsterrestelsel

	Reticulum II
Soort stelsel	Elliptiese dwergsterrestelsel
Sterrebeeld	Net
	Waarnemingsdata (Epog J2000)
Regte klimming	03h 35m 42.14s
Deklinasie	-54° 2′ 57.1″
Skynmagnitude	17,4
	Besonderhede
Afstand (ligjaar)	103 000
Skynbare grootte	3,37′ × 3,64′
Ander name	Reticulum 2
Portaal	Sterrekunde

Reticulum II (of Reticulum 2) is 'n elliptiese dwergsterrestelsel in die Plaaslike Groep. Dit is in 2015 ontdek deur die ontleding van beelde van die Dark Energy Survey. Dit is 'n satelliet van die Magellaanse Wolke en is waarskynlik redelik onlangs aangetrek.^[3] Nes ander elliptiese dwergstelsels is sy sterre baie oud: Nuwe sterre het meer as 11,5 miljard jaar gelede ophou vorm.^[3]

Kenmerke

Reticulum II is 'n lang stelsel en te groot om 'n bolswerm te wees. Dit is sowat 103 000 ligjare van die Son af.^[2] Dit bevat baie sterre van die blou horisontale tak. Ander kenmerke sluit in 'n hoofreeks en 'n rooireustak.^[1]^[4] 'n Vreemde kenmerk is dat sowat 72% van die stelsel se sterre met elemente swaarder as sink verryk is. Dit het waarkskynlik net een keer in dié sterrestelsel gebeur, moontlik vanweë die botsing tussen twee neutronsterre.^[5]

Sien ook

Lys van Melkweg se satelliet-sterrestelsels

Verwysings

1 2 3 4 5 6 Sergey E. Koposov; Vasily Belokurov; Gabriel Torrealba; N. Wyn Evans (10 Maart 2015). "Beasts of the Southern Wild. Discovery of a large number of Ultra Faint satellites in the vicinity of the Magellanic Clouds". The Astrophysical Journal. 805 (2): 130. arXiv:1503.02079. Bibcode:2015ApJ...805..130K. doi:10.1088/0004-637X/805/2/130. S2CID 118267222.
1 2 Simon, Joshua D.; et al. (2023). "Timing the r-process Enrichment of the Ultra-faint Dwarf Galaxy Reticulum II". The Astrophysical Journal. 944 (1): 43. arXiv:2212.00810. Bibcode:2023ApJ...944...43S. doi:10.3847/1538-4357/aca9d1. S2CID 254221028.
1 2 Sacchi, Elena; Richstein, Hannah; Kallivayalil, Nitya; Van Der Marel, Roeland; Libralato, Mattia; Zivick, Paul; Besla, Gurtina; Brown, Thomas M.; Choi, Yumi; Deason, Alis; Fritz, Tobias; Geha, Marla; Guhathakurta, Puragra; Jeon, Myoungwon; Kirby, Evan; Majewski, Steven R.; Patel, Ekta; Simon, Joshua D.; Tony Sohn, Sangmo; Tollerud, Erik; Wetzel, Andrew (2021). "Star Formation Histories of Ultra-faint Dwarf Galaxies: Environmental Differences between Magellanic and Non-Magellanic Satellites?". The Astrophysical Journal Letters. 920 (1): L19. arXiv:2108.04271. Bibcode:2021ApJ...920L..19S. doi:10.3847/2041-8213/ac2aa3. S2CID 236965965.
↑ DES Collaboration (10 Maart 2015). "Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data". The Astrophysical Journal. 807 (1): 50. arXiv:1503.02584. Bibcode:2015ApJ...807...50B. doi:10.1088/0004-637X/807/1/50. S2CID 12011753.
↑ Ji, Alexander P.; Frebel, Anna; Chiti, Anirudh; Simon, Joshua D. (21 Maart 2016). "R-process enrichment from a single event in an ancient dwarf galaxy". Nature. 531 (7596): 610–613. arXiv:1512.01558. Bibcode:2016Natur.531..610J. doi:10.1038/nature17425. PMID 27001693. S2CID 205248401.

Skakels

Hierdie artikel is in sy geheel of gedeeltelik uit die Engelse Wikipedia vertaal.

[Koposov2015-1] 1 2 3 4 5 6 Sergey E. Koposov; Vasily Belokurov; Gabriel Torrealba; N. Wyn Evans (10 Maart 2015). "Beasts of the Southern Wild. Discovery of a large number of Ultra Faint satellites in the vicinity of the Magellanic Clouds". The Astrophysical Journal. 805 (2): 130. arXiv:1503.02079. Bibcode:2015ApJ...805..130K. doi:10.1088/0004-637X/805/2/130. S2CID 118267222.

[Simon-2] 1 2 Simon, Joshua D.; et al. (2023). "Timing the r-process Enrichment of the Ultra-faint Dwarf Galaxy Reticulum II". The Astrophysical Journal. 944 (1): 43. arXiv:2212.00810. Bibcode:2023ApJ...944...43S. doi:10.3847/1538-4357/aca9d1. S2CID 254221028.

[Sacchi-3] 1 2 Sacchi, Elena; Richstein, Hannah; Kallivayalil, Nitya; Van Der Marel, Roeland; Libralato, Mattia; Zivick, Paul; Besla, Gurtina; Brown, Thomas M.; Choi, Yumi; Deason, Alis; Fritz, Tobias; Geha, Marla; Guhathakurta, Puragra; Jeon, Myoungwon; Kirby, Evan; Majewski, Steven R.; Patel, Ekta; Simon, Joshua D.; Tony Sohn, Sangmo; Tollerud, Erik; Wetzel, Andrew (2021). "Star Formation Histories of Ultra-faint Dwarf Galaxies: Environmental Differences between Magellanic and Non-Magellanic Satellites?". The Astrophysical Journal Letters. 920 (1): L19. arXiv:2108.04271. Bibcode:2021ApJ...920L..19S. doi:10.3847/2041-8213/ac2aa3. S2CID 236965965.

[Bechtol2015-4] DES Collaboration (10 Maart 2015). "Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data". The Astrophysical Journal. 807 (1): 50. arXiv:1503.02584. Bibcode:2015ApJ...807...50B. doi:10.1088/0004-637X/807/1/50. S2CID 12011753.

[nat1-5] Ji, Alexander P.; Frebel, Anna; Chiti, Anirudh; Simon, Joshua D. (21 Maart 2016). "R-process enrichment from a single event in an ancient dwarf galaxy". Nature. 531 (7596): 610–613. arXiv:1512.01558. Bibcode:2016Natur.531..610J. doi:10.1038/nature17425. PMID 27001693. S2CID 205248401.

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