NGC 4393 explained

NGC 4393
Epoch:J2000
Type:SABd[1]
Dist Ly:14.2Mpc
Group Cluster:Coma I (NGC 4274 subgroup)
H Radial V:751 km/s
Z:0.002505
Appmag V:12.7
Size V:3.2 x 3.0
Constellation Name:Coma Berenices
Names:UGC 07521, PGC 040600, MCG +05-29-083
Size:~11.86kpc (estimated)

NGC 4393 is a spiral galaxy about 46 million light-years away[2] in the constellation Coma Berenices. It was discovered by astronomer William Herschel on April 11, 1785.[3] It is a member of the NGC 4274 Group,[4] [5] which is part of the Coma I Group[6] or Cloud.[7]

Physical characteristics

NGC 4393 is a flocculent spiral galaxy,[8] [9] with chaotic, fragmented and unsymmetric arms. IC 3329, an HII region in NGC 4393,[10] was discovered by astronomer Max Wolf on March 23, 1903. It was described as "very faint, small, irregular figure, attached to (NGC) 4393".[11]

NGC 4393 hosts a pseudo-bulge,[12] a type of galactic bulge which is more similar to a spiral galaxy in that it has one or more characteristics of disk galaxies. These include having flatter shapes than those of classical bulges, large ratios of ordered motions of stars rather than random motions of stars, small velocity dispersions of stars with respect to the Faber-Jackson correlation between velocity dispersion and bulge luminosity, a spiral structure or nuclear bar in the bulge part of the light profile, nearly exponential brightness profiles, and starbursts.[13]

Nuclear Star Cluster

The central region of NGC 4393 is host to a nuclear star cluster[14] with a mass of 0.4048 ± 0.0819 × 106 M☉,[15] and a diameter of ~4.8pc.[16]

See also

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 4393 . 2022-04-18.
  2. Web site: Your NED Search Results . 2022-04-22 . ned.ipac.caltech.edu.
  3. Web site: New General Catalog Objects: NGC 4350 - 4399 . 2022-04-12 . cseligman.com.
  4. Kourkchi . Ehsan . Tully . R. Brent . 2017-06-27 . Galaxy Groups Within 3500 km s −1 . The Astrophysical Journal . 843 . 1 . 16 . 10.3847/1538-4357/aa76db . 1705.08068 . 2017ApJ...843...16K . 119407480 . 1538-4357 . free .
  5. Web site: The Extragalactic Distance Database (EDD) . 2022-04-22 . edd.ifa.hawaii.edu.
  6. Web site: Nearby Groups of Galaxies . 2022-04-12 . ned.ipac.caltech.edu.
  7. Gregory . Stephen A. . Thompson . Laird A. . 1977-04-01 . The Coma i Galaxy Cloud . The Astrophysical Journal . 213 . 345–350 . 10.1086/155160 . 1977ApJ...213..345G . 0004-637X.
  8. Elmegreen . D. M. . Elmegreen . B. G. . 1982-12-01 . Flocculent and grand design spiral structure in field, binary and group galaxies . Monthly Notices of the Royal Astronomical Society . en . 201 . 4 . 1021–1034 . 10.1093/mnras/201.4.1021 . 0035-8711. free .
  9. Elmegreen . Debra Meloy . Elmegreen . Bruce G. . March 1987 . Arm classifications for spiral galaxies . The Astrophysical Journal . en . 314 . 3 . 10.1086/165034 . 1987ApJ...314....3E . 0004-637X.
  10. Web site: Your NED Search Results . 2022-04-22 . ned.ipac.caltech.edu.
  11. Web site: Index Catalog Objects: IC 3300 - 3349 . 2022-04-22 . cseligman.com.
  12. Vaghmare . Kaustubh . Barway . Sudhanshu . Mathur . Smita . Kembhavi . Ajit K. . 2015-06-11 . Spiral galaxies as progenitors of pseudo-bulge hosting S0s . Monthly Notices of the Royal Astronomical Society . en . 450 . 1 . 873–882 . 10.1093/mnras/stv668 . free . 0035-8711. 1503.07635 .
  13. Kormendy . John . Kennicutt . Robert C. . 2004-09-22 . Secular Evolution and the Formation of Pseudobulges in Disk Galaxies . Annual Review of Astronomy and Astrophysics . en . 42 . 1 . 603–683 . 10.1146/annurev.astro.42.053102.134024 . astro-ph/0407343 . 2004ARA&A..42..603K . 515479 . 0066-4146.
  14. Georgiev . Iskren Y. . Böker . Torsten . 2014-07-11 . Nuclear star clusters in 228 spiral galaxies in the HST/WFPC2 archive: catalogue and comparison to other stellar systems . Monthly Notices of the Royal Astronomical Society . en . 441 . 4 . 3570–3590 . 10.1093/mnras/stu797 . 1365-2966. free . 1404.5956 .
  15. Leigh . Nathan W. C. . Georgiev . Iskren Y. . Böker . Torsten . Knigge . Christian . den Brok . Mark . 2015-07-21 . Nuclear star cluster formation in energy-space . Monthly Notices of the Royal Astronomical Society . en . 451 . 1 . 859–869 . 10.1093/mnras/stv1012 . 1365-2966. free . 1505.01158 .
  16. Georgiev . Iskren Y. . Böker . Torsten . Leigh . Nathan . Lützgendorf . Nora . Neumayer . Nadine . 2016-04-01 . Masses and scaling relations for nuclear star clusters, and their co-existence with central black holes . Monthly Notices of the Royal Astronomical Society . en . 457 . 2 . 2122–2138 . 10.1093/mnras/stw093 . 0035-8711. free . 1601.02613 . 2016MNRAS.457.2122G .

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