Astronomy:Abell 209

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Short description: Galaxy cluster in the constellation Cetus
Abell 209
A cluster of distant, mainly elliptical galaxies. They appear as brightly shining points radiating golden light that each take the shape of a smooth, featureless oval. They crowd around one that is extremely large and bright. A few spiral galaxies of comparable size appear too, bluer in colour and with unique shapes. Of the other, more small and distant galaxies covering the scene, a few are warped into long lines.
Abell 209 imaged by the Hubble Space Telescope
Observation data (Epoch J2000)
Constellation(s)Cetus
Right ascension 01h 31m 53.0000s[1]
Declination−13° 36′ 34.000″[1]
Brightest memberABELL 0209 BCG
Richness class3[2]
Bautz–Morgan classificationII-III[2]
Redshift0.209[1]
Distance
(co-moving)		919.97 ± 64.45 Mpc (3,001 ± 210 Mly)[1]
Other designations
ACO 209, 1RXS J013152.8-133651, ACT-CL J0131.8-1336[1]
See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters

Abell 209 is a galaxy cluster located in the constellation Cetus at a distance of about 3 billion light-years from Earth.[1] Included in Abell catalogue compiled by George O. Abell in 1958, it has a wealth class 3 (clusters consisting of 130-199 galaxies), and is of type II-III in the Bautz–Morgan classification.[2]

Abell 209 was one of 25 galaxy clusters studied with the Hubble Space Telescope during an observational campaign, called the Cluster Lensing and Supernova survey with Hubble (CLASH), over a three-and-a-half-year period, from 2010 to 2013.[3] Its redshift has been recalculated, now estimated at z = 0.209 (previously 0.206).[4]

Abell 209 is located in the vicinity of Abell 222, from which it is separated by a distance of about 19.2 megaparsecs (62.6 million light-years).[5]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "NED results for object ABELL 0209". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=ABELL+0209. 
  2. ↑ 2.0 2.1 2.2 Abell, George O. (1958). "The distribution of rich clusters of galaxies. A catalog of 2712 rich clusters found on the National Geographic Society Palomar Observatory Sky Survey". The Astrophysical Journal Supplement Series 3: 211–88. doi:10.1086/190036. Bibcode: 1958ApJS....3..211A. https://thesis.library.caltech.edu/1581/1/Abell_GO_1957.pdf. Retrieved 2025-07-03. 
  3. ↑ Postman, Marc. "CLASH: An Innovative Survey to Place New Constraints on the Fundamental Components of the Cosmos using the Hubble Space Telescope". Space Telescope Science Institute. http://www.stsci.edu/~postman/CLASH/Home.html. Retrieved 3 July 2025. 
  4. ↑ Mercurio, A.; Gargiulo, A.; Maturi, M.; Smith, G. P.; Presotto, V.; Annunziatella, M.; Biviano, A.; Girardi, M. et al. (January 2016). "CLASH-VLT: Environment-driven evolution of galaxies in the z = 0.209 cluster Abell 209". Astronomy & Astrophysics 588: A35. doi:10.1051/0004-6361/201527399. 
  5. ↑ Durret, F.; Laganá, T. F.; Adami, C.; Bertin, E. (July 2010). "The clusters Abell 222 and Abell 223: a multi-wavelength view". Astronomy & Astrophysics 517: A94. doi:10.1051/0004-6361/201014566. 

Coordinates: Sky map 01h 31m 53.0000s, −13° 36′ 34.000″



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