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]
Four supernovae have been observed in the Butterfly Galaxies: SN 1990B (type Ib, mag. 16),[7] SN 2004cc (type Ic, mag. 17.5),[8]SN 2020fqv (type IIb, mag. 19),[9] and SN 2023ijd (type II, mag. 16.8).[10]
The two galaxies 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.[11]
^ abCong 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)
^ abCudnik B. (2013). "The Nature of Galaxies and Galaxy Clusters". Faint Objects and How to Observe Them. Astronomers' Observing Guides. Springer. pp. 71–91. doi:10.1007/978-1-4419-6757-2_4. ISBN978-1-4419-6756-5.
^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.
^Transient Name Server entry for SN 1990B. Retrieved 30 March 2023.
^Transient Name Server entry for SN 2004cc. Retrieved 30 March 2023.
4567, 4568, nicknamed, butterfly, galaxies, siamese, twins, unbarred, spiral, galaxies, about, million, light, years, away, constellation, virgo, they, were, both, discovered, william, herschel, 1784, they, part, virgo, cluster, galaxies, butterfly, galaxies, . 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 4568The Butterfly Galaxies with NGC 4567 top and NGC 4568 bottom Observation data J2000 0 epoch ConstellationVirgoRight ascension12h 36m 34 3sDeclination 11 14 17 Distance62 Mly 19 1 Mpc 1 Apparent magnitude V 10 9Absolute magnitude V 13 3CharacteristicsTypeSA rs bc SA rs bcApparent size V 4 6 2 1 Notable featurescolliding galaxiesOther designationsNGC 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 Four supernovae have been observed in the Butterfly Galaxies SN 1990B type Ib mag 16 7 SN 2004cc type Ic mag 17 5 8 SN 2020fqv type IIb mag 19 9 and SN 2023ijd type II mag 16 8 10 SN 2023idj in NGC 4568 as seen on 2023 May 17 Contents 1 Naming controversy 2 See also 3 Notes 4 References 5 External linksNaming controversy editThe two galaxies 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 11 See also edit nbsp Wikimedia Commons has media related to NGC 4567 nbsp Wikimedia Commons has media related to NGC 4568 Antennae Galaxies Eyes GalaxiesNotes edit a b NASA no longer uses the Siamese Twins terms due to perceived discriminatory namingReferences edit a b Distance Results for NGC 4568 NASA IPAC Extragalactic Database Retrieved 2010 05 01 VV 219 Interacting Galaxies SIMBAD KPG 347 Pair of Galaxies SIMBAD a b 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 a href Template Cite journal html title Template Cite journal cite journal a Cite journal requires journal help a b Cudnik B 2013 The Nature of Galaxies and Galaxy Clusters Faint Objects and How to Observe Them Astronomers Observing Guides Springer pp 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 Transient Name Server entry for SN 1990B Retrieved 30 March 2023 Transient Name Server entry for SN 2004cc Retrieved 30 March 2023 SN 2020fqv Transient Name Server Transient Name Server entry for SN 2023ijd Retrieved 14 May 2023 Haworth Jon August 9 2020 NASA drops insensitive celestial nicknames in effort to address systemic discrimination ABC News retrieved 2020 08 10External links editKopernik 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 nbsp This spiral galaxy article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title NGC 4567 and NGC 4568 amp oldid 1172141895, wikipedia, wiki, book, books, library,
