Eridanus Cluster

The Eridanus Cluster is a galaxy cluster roughly 23 Mpc (75 Mly) from Earth, containing about 73 main galaxies and about 200 total galaxies. About 30% have Hubble classifications of elliptical or S0 and the remaining 70% are spiral or irregular.[2] These galaxies reside in smaller groups which are all loosely gravitationally bound to each other, suggesting that the system is still condensing from the Hubble flow and may eventually form a cluster of about 1014 M. A low velocity dispersion compared to that of, for example, the Coma cluster, supports this hypothesis.[3] The Eridanus Cluster is located in the constellation Eridanus near the Fornax Cluster, and is sometimes called the "Fornax II Cluster".[4]

Eridanus Cluster
Observation data (Epoch J2000)
Constellation(s)Eridanus
Right ascension03h 28m 13.8s[1]
Declination−20° 44 40[1]
Brightest memberNGC 1232 (B)
Number of galaxies~200[2]
Velocity dispersion261 km/s[3]
Redshift0.005570[1]
Distance23 Mpc (75 Mly)[1]
ICM temperature~107 K (~1 keV)[2]
Binding mass~1014[3] M
X-ray flux0.105 mCrab[2]
Other designations
Fornax II Cluster,[4] de Vaucouleurs Group 31[5]
The spiral galaxy NGC 1232 is one of the brightest in the Eridanus Cluster.
The barred spiral galaxy NGC 1300 is a well-known member of the Eridanus Cluster.

Table of galaxies

Name of the galaxy
Right ascension for epoch J2000
Declination for epoch J2000
Blue apparent magnitude of the galaxy
Galaxy type: E=Elliptical; S0=Lenticular; Sa, Sb, Sc, Sd=Spiral (degree of woundedness of spiral arms); SBa, SBb, SBc, SBd=Barred Spiral; SAB= Intermediate Spiral (between barred and unbarred); Sm, SBm, Irr=Irregular; (r),(rs)=Ring Structure
Angular diameter of the galaxy (arcminutes)
Diameter of the galaxy (thousands of light years)
Recessional velocity (km/s) of the galaxy relative to the cosmic microwave background
NameRA equatorial
coordinates
Dec equatorial
coordinates
Blue
Mag
TypeSize
(arcmin)
Size
(kly)
RV
(km/s)
ESO 547-0903 06.0–19 2316.8Irr1.3351509
ESO 547-1203 09.6–17 5016.5Scd1.5351837
NGC 123203 09.8–20 3510.7SAB(rs)c6.91701517
IC 189803 10.3–22 2413.7SBc3.4851164
ESO 547-2003 13.0–17 5616.0SBm1.2301825
NGC 125803 14.1–21 4613.9SBc1.3301340
NGC 129703 19.2–19 0613.5E2.0501395
NGC 130003 19.7–19 2511.2SBbc6.01101421
NGC 131503 23.1–21 2314.0S01.5351534
PGC 1268003 23.4–19 17 ?Irr1.3301400
ESO 548-0503 23.8–19 4514.7SBm1.5351690
NGC 132503 24.4–21 3312.3SBbc4.71151446
NGC 1325A03 24.8–21 2013.6SBcd1.8451188
ESO 548-1603 26.0–21 2015.6Scd1.7401977
NGC 133203 26.3–21 2011.4E4.21051383
ESO 548-2103 27.6–21 1414.7SBd2.0501541
ESO 548-2503 29.0–22 0915.0SBa1.3301542
NGC 134503 29.5–17 4714.3SBc1.4351385
ESO 481-3003 29.6–23 2115.5Scd1.5351504
NGC 134703 29.7–22 1713.9SBc1.4351624
ESO 548-2803 30.6–17 5614.0S01.3351360
ESO 548-2903 30.8–21 0314.3SBbc1.1301175
NGC 135303 32.1–20 4912.4SBb3.5851390
ESO 548-3203 32.3–17 4315.8SBm1.6401815
ESO 548-3303 32.5–18 5714.5S01.3351552
ESO 548-3403 33.0–21 0514.6SBc1.1301610
ESO 482-0503 33.0–24 0815.2SBcd2.1501783
NGC 135703 33.2–13 3912.4Sab3.2852018
IC 195203 33.4–23 4313.5SBbc2.5601683
IC 195303 33.7–21 2912.7SBc2.6651733
NGC 135903 33.8–19 2913.0SBm2.1551833
NGC 136203 33.9–20 1714.2S01.2301085
ESO 548-4403 34.3–19 2514.2S01.3351561
ESO 548-4703 34.7–19 0214.1S02.5601472
NGC 136703 35.0–24 5611.6SBa5.61401344
NGC 137003 35.2–20 2213.9E1.535933
IC 196203 35.6–21 1814.8SBd2.5601670
ESO 482-1103 36.3–25 3614.7Sbc1.4351469
NGC 137703 36.7–20 5413.8S01.7451645
NGC 138503 37.5–24 3011.5SBc3.7901373
NGC 138303 37.7–18 2013.8S01.7401828
ESO 482-1703 37.7–22 5514.9Sab1.3301330
NGC 139003 37.9–19 0014.9SBa1.3351078
NGC 139503 38.5–23 0210.7E5.61401577
NGC 139803 38.9–26 2010.5SB(r)ab7.11351289
NGC 140303 39.2–22 2314.1E1.3301751
NGC 140103 39.4–22 4313.7S01.9501406
NGC 140003 39.5–18 4112.3E2.360415
ESO 548-6303 39.6–20 0115.1Sbc1.4351846
ESO 548-6503 40.0–19 2215.3Sa1.4351102
IC 34303 40.1–18 2714.3S01.4351730
NGC 140703 40.2–18 3510.9E5.11251650
ESO 548-6803 40.3–18 5614.3E1.3351636
NGC 141203 40.5–26 5214.7S01.4351675
ESO 548-7003 40.7–22 1715.4SBcd1.6401615
ESO 482-3203 40.7–26 4715.9Irr1.2301621
NGC 141503 40.9–22 3412.8Sa3.3801451
NGC 141403 41.0–21 4314.6SBbc1.6401464
ESO 482-3503 41.2–23 5014.2SBab1.8451756
NGC 142203 41.5–21 4114.2SBab2.3551514
IC 34603 41.7–18 1613.9S01.9451830
ESO 548-7903 41.9–18 5414.8Sa1.1301914
ESO 548-8203 42.7–17 3015.4Sbc1.1301590
NGC 142603 42.8–22 0612.7E2.5601296
ESO 549-0203 43.0–19 0114.9SBm1.330988
ESO 549-0603 43.6–21 1415.7Irr1.3301490
NGC 143903 44.8–21 5512.4E2.6651577
NGC 144003 45.0–18 1612.9S02.2551403
NGC 143803 45.3–23 0013.3SBa2.0501438
NGC 145203 45.4–18 3812.9Sa2.3601619
ESO 549-1803 48.2–21 2813.3SBc2.5601473
ESO 482-4603 49.7–27 0013.7Sc3.5901422
ESO 482-4903 52.4–23 0315.3Sc1.1301377
NGC 148203 54.6–20 3013.3S02.2551753

See also

References

  1. "Eridanus Cluster". NASA/IPAC Extragalactic Database (NED). Retrieved 2012-02-25.
  2. Omar, A.; Dwarakanath, K. S. (March 2005). "GMRT HI Observations of the Eridanus Group of Galaxies I" (PDF). Journal of Astrophysics and Astronomy. 26 (1): 1–33. arXiv:astro-ph/0503536. Bibcode:2005JApA...26....1O. doi:10.1007/BF02702451. S2CID 7451092. Retrieved 2012-02-25.
  3. Willmer, C. N. A.; Rocardi, P.; da Costa, L. Nicolaci; Pellegrini, P. S. (November 1989). "Studies of nearby poor clusters – The Eridanus group" (PDF). Astronomical Journal. 98 (Nov. 1989): 1531–1541. Bibcode:1989AJ.....98.1531W. doi:10.1086/115236. ISSN 0004-6256. Retrieved 2012-02-25.
  4. atlasoftheuniverse.com
  5. Chincarini, G.; Rood, H. J.; Welch, G. A. (March 1975). "A re-analysis of the dynamics of the nearby groups of galaxies". Monthly Notices of the Royal Astronomical Society. 170 (Mar. 1975): 441–445. Bibcode:1975MNRAS.170..441C. doi:10.1093/mnras/170.3.441. A&AA ID. AAA013.160.006.
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