astro.wikisort.org - Galaxy
NGC 4567 and NGC 4568 (nicknamed the Butterfly Galaxies[4] or Siamese Twins[NB 1][5]) are a set of unbarred spiral galaxies about 60 million light-years away[1] in the constellation Virgo. They were both discovered by William Herschel in 1784. They are part of the Virgo Cluster of galaxies.
| NGC 4567 and NGC 4568 | |
|---|---|
 The Butterfly Galaxies with NGC 4567 (top) and NGC 4568 (bottom) | |
| Observation data (J2000.0 epoch) | |
| Constellation | Virgo |
| Right ascension | 12h 36m 34.3s |
| Declination | +11° 14′ 17″ |
| Distance | 59.4 Mly (18.2 Mpc)[1] |
| Apparent magnitude (V) | +10.9 |
| Absolute magnitude (V) | -13.3 |
| Characteristics | |
| Type | SA(rs)bc / SA(rs)bc |
| Apparent size (V) | 4.6′ × 2.1′ |
| Notable features | colliding galaxies |
| Other designations | |
| NGC 4567/8, UGC 7776/7, PGC 42064/9, VV 219,[2] KPG 347,[3] Butterfly Galaxies,[4] Siamese Twin Galaxies, Siamese Twins Galaxies, Siamese Twins[5][NB 1] | |
These galaxies are in the process of colliding and merging with each other, as studies of their distributions of neutral and molecular hydrogen show, with the highest star-formation activity in the part where they overlap. However, the system is still in an early phase of interaction.[6]
Only one supernova (SN 2004cc) was observed in the Butterfly Galaxies until March 31, 2020, when the Zwicky Transient Facility detected the rapidly-rising SN 2020fqv in NGC 4568.[7]
Naming controversy
They were nicknamed "Siamese Twins" because they appear to be connected. On August 5, 2020, NASA announced that they would not use that nickname in an effort to avoid systemic discrimination in their terminology.[8]
See also
Notes
- NASA no longer uses the "Siamese Twins" terms due to perceived discriminatory naming
References
- "Distance Results for NGC 4568". NASA/IPAC Extragalactic Database. Retrieved 2010-05-01.
- "VV 219 -- Interacting Galaxies". SIMBAD.
- "KPG 347 -- Pair of Galaxies". SIMBAD.
- Cong Xu; Yu Gao; Joseph Mazzarella; Nanyao Lu; Jack W. Sulentic; Donovan L. Domingue (2000). "Mapping IR Enhancements in Closely Interacting Spiral-Spiral Pairs. I. IS0 CAM and IS0 SWS Observations". 10.1.1.317.8256.
{{cite journal}}: Cite journal requires|journal=(help)CS1 maint: uses authors parameter (link) - Cudnik B. (2013). "The Nature of Galaxies and Galaxy Clusters". Faint Objects and How to Observe Them. Astronomers' Observing Guides. Springer: 71–91. doi:10.1007/978-1-4419-6757-2_4. ISBN 978-1-4419-6756-5.
- Kaneko, H.; Kuno, N.; Iono, D.; Tosaki, T.; Sawada, T.; Nakanishi, H.; Hirota, A. (2010). "Molecular Gas in the Early Stage of Interacting Galaxies: The NGC 4567/8 Pair". Galaxy Wars: Stellar Populations and Star Formation in Interacting Galaxies. 423: 26. Bibcode:2010ASPC..423...26K.
- "SN 2020fqv". Transient Name Server.
- Haworth, Jon (August 9, 2020), "NASA drops 'insensitive' celestial nicknames in effort to address systemic discrimination", ABC News, retrieved 2020-08-10
External links
- Kopernik Space Images, Spiral Galaxies NGC 4568 and NGC 4567 aka "The Siamese Twins" : Supernova 2004cc, George Normandin (29 June 2004)
- Skyhound, The Siamese Twins
- SIMBAD, VCC 1673 : NGC 4567 -- Galaxy in Pair of Galaxies
- SIMBAD, VCC 1676 : NGC 4568 -- Galaxy in Pair of Galaxies
- NED, VV 219
- NED, NGC 4567
- NED, NGC 4568
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На других языках
[de] NGC 4567/8
NGC 4567/8 oder KPG 347 oder VV 219 sind zwei Spiralgalaxien im Virgo-Cluster im Sternbild Virgo. Die Galaxien werden auch "The Butterfly Galaxies" oder "The Siamese Twins" genannt (letzterer Name wird laut NASA wegen des diskriminatorischen Inhalts nicht mehr benutzt).[5] Es wird angenommen, dass sich das Paar in einem frühen Stadium der Interaktion befindet.- [en] NGC 4567 and NGC 4568
[es] NGC 4567 y NGC 4568
NGC 4567 y NGC 4568 son dos galaxias interactuando que se encuentran en la constelación de Virgo y que muy posiblemente son miembros del Cúmulo de Virgo. NGC 4568 es una galaxia espiral con una inclinación intermedia y de magnitud aparente 11,7. NGC 4567, también galaxia espiral, aparece prácticamente de frente y su magnitud es 12,1. Visualmente, utilizando pequeños instrumentos aparecen como una mancha en forma de V. Informalmente se las ha llamado los "gemelos siameses".Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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