Eridanus Cluster

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Not to be confused with Eridanus Group.
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]
Distance
(co-moving)		23 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]
See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters
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.

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]

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
Name RA equatorial
coordinates		 Dec equatorial
coordinates		 Blue
Mag		 Type Size
(arcmin)		 Size
(kly)		 RV
(km/s)
03 06.0 -19 23 16.8 Irr 1.3 35 1509
03 09.6 -17 50 16.5 Scd 1.5 35 1837
NGC 1232 03 09.8 -20 35 10.7 SAB(rs)c 6.9 170 1517
03 10.3 -22 24 13.7 SBc 3.4 85 1164
03 13.0 -17 56 16.0 SBm 1.2 30 1825
03 14.1 -21 46 13.9 SBc 1.3 30 1340
03 19.2 -19 06 13.5 E 2.0 50 1395
NGC 1300 03 19.7 -19 25 11.2 SBbc 6.0 110 1421
03 23.1 -21 23 14.0 S0 1.5 35 1534
03 23.4 -19 17 ? Irr 1.3 30 1400
03 23.8 -19 45 14.7 SBm 1.5 35 1690
NGC 1325 03 24.4 -21 33 12.3 SBbc 4.7 115 1446
03 24.8 -21 20 13.6 SBcd 1.8 45 1188
03 26.0 -21 20 15.6 Scd 1.7 40 1977
NGC 1332 03 26.3 -21 20 11.4 E 4.2 105 1383
03 27.6 -21 14 14.7 SBd 2.0 50 1541
03 29.0 -22 09 15.0 SBa 1.3 30 1542
NGC 1345 03 29.5 -17 47 14.3 SBc 1.4 35 1385
03 29.6 -23 21 15.5 Scd 1.5 35 1504
NGC 1347 03 29.7 -22 17 13.9 SBc 1.4 35 1624
03 30.6 -17 56 14.0 S0 1.3 35 1360
03 30.8 -21 03 14.3 SBbc 1.1 30 1175
NGC 1353 03 32.1 -20 49 12.4 SBb 3.5 85 1390
03 32.3 -17 43 15.8 SBm 1.6 40 1815
03 32.5 -18 57 14.5 S0 1.3 35 1552
03 33.0 -21 05 14.6 SBc 1.1 30 1610
03 33.0 -24 08 15.2 SBcd 2.1 50 1783
NGC 1357 03 33.2 -13 39 12.4 Sab 3.2 85 2018
03 33.4 -23 43 13.5 SBbc 2.5 60 1683
IC 1953 03 33.7 -21 29 12.7 SBc 2.6 65 1733
03 33.8 -19 29 13.0 SBm 2.1 55 1833
03 33.9 -20 17 14.2 S0 1.2 30 1085
03 34.3 -19 25 14.2 S0 1.3 35 1561
03 34.7 -19 02 14.1 S0 2.5 60 1472
03 35.0 -24 56 11.6 SBa 5.6 140 1344
03 35.2 -20 22 13.9 E 1.5 35 933
03 35.6 -21 18 14.8 SBd 2.5 60 1670
03 36.3 -25 36 14.7 Sbc 1.4 35 1469
03 36.7 -20 54 13.8 S0 1.7 45 1645
03 37.5 -24 30 11.5 SBc 3.7 90 1373
03 37.7 -18 20 13.8 S0 1.7 40 1828
03 37.7 -22 55 14.9 Sab 1.3 30 1330
03 37.9 -19 00 14.9 SBa 1.3 35 1078
NGC 1395 03 38.5 -23 02 10.7 E 5.6 140 1577
NGC 1398 03 38.9 -26 20 10.5 SB(r)ab 7.1 135 1289
NGC 1403 03 39.2 -22 23 14.1 E 1.3 30 1751
03 39.4 -22 43 13.7 S0 1.9 50 1406
NGC 1400 03 39.5 -18 41 12.3 E 2.3 60 415
03 39.6 -20 01 15.1 Sbc 1.4 35 1846
03 40.0 -19 22 15.3 Sa 1.4 35 1102
03 40.1 -18 27 14.3 S0 1.4 35 1730
NGC 1407 03 40.2 -18 35 10.9 E 5.1 125 1650
03 40.3 -18 56 14.3 E 1.3 35 1636
03 40.5 -26 52 14.7 S0 1.4 35 1675
03 40.7 -22 17 15.4 SBcd 1.6 40 1615
03 40.7 -26 47 15.9 Irr 1.2 30 1621
03 40.9 -22 34 12.8 Sa 3.3 80 1451
03 41.0 -21 43 14.6 SBbc 1.6 40 1464
03 41.2 -23 50 14.2 SBab 1.8 45 1756
03 41.5 -21 41 14.2 SBab 2.3 55 1514
03 41.7 -18 16 13.9 S0 1.9 45 1830
03 41.9 -18 54 14.8 Sa 1.1 30 1914
03 42.7 -17 30 15.4 Sbc 1.1 30 1590
NGC 1426 03 42.8 -22 06 12.7 E 2.5 60 1296
03 43.0 -19 01 14.9 SBm 1.3 30 988
03 43.6 -21 14 15.7 Irr 1.3 30 1490
NGC 1439 03 44.8 -21 55 12.4 E 2.6 65 1577
03 45.0 -18 16 12.9 S0 2.2 55 1403
03 45.3 -23 00 13.3 SBa 2.0 50 1438
NGC 1452 03 45.4 -18 38 12.9 Sa 2.3 60 1619
03 48.2 -21 28 13.3 SBc 2.5 60 1473
03 49.7 -27 00 13.7 Sc 3.5 90 1422
03 52.4 -23 03 15.3 Sc 1.1 30 1377
03 54.6 -20 30 13.3 S0 2.2 55 1753

See also[]

References[]

  1. ^ a b c d "Eridanus Cluster". NASA/IPAC Extragalactic Database (NED). Retrieved 2012-02-25.
  2. ^ a b c d 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. ^ a b c 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. ^ a b 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" (PDF). 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. Retrieved March 10, 2012.

Coordinates: Sky map 03h 28m 13.8s, −20° 44′ 40″

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