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NGC 4393

From Wikipedia, the free encyclopedia
Galaxy in the constellation of Coma Berenices
NGC 4393
SDSS image of NGC 4393.
Observation data (J2000epoch)
ConstellationComa Berenices
Right ascension12h 25m 51.2s[1]
Declination27° 33′ 42″[1]
Redshift0.002505[1]
Heliocentric radial velocity751 km/s[1]
Distance46 Mly (14.2 Mpc)[1]
Group orclusterComa I (NGC 4274 subgroup)
Apparent magnitude (V)12.7[1]
Characteristics
TypeSABd[1]
Size~38,700 ly (11.86 kpc) (estimated)[1]
Apparent size (V)3.2 x 3.0[1]
Other designations
UGC 07521, PGC 040600, MCG +05-29-083[1]

NGC 4393 is aspiral galaxy about 46 millionlight-years away[2] in theconstellationComa Berenices. It was discovered by astronomerWilliam Herschel on April 11, 1785.[3] It is a member of theNGC 4274 Group,[4][5] which is part of theComa I Group[6] orCloud.[7]

Physical characteristics

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

NGC 4393 hosts apseudo-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 theFaber-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, andstarbursts.[13]

Nuclear Star Cluster

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The central region of NGC 4393 is host to anuclear star cluster[14] with a mass of 0.4048 ± 0.0819 millionM☉,[15] and a diameter of ~16 ly (4.8 pc).[16]

See also

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References

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  1. ^abcdefghij"NASA/IPAC Extragalactic Database".Results for NGC 4393. Retrieved2022-04-18.
  2. ^"Your NED Search Results".ned.ipac.caltech.edu. Retrieved2022-04-22.
  3. ^"New General Catalog Objects: NGC 4350 - 4399".cseligman.com. Retrieved2022-04-12.
  4. ^Kourkchi, Ehsan; Tully, R. Brent (2017-06-27)."Galaxy Groups Within 3500 km s −1".The Astrophysical Journal.843 (1): 16.arXiv:1705.08068.Bibcode:2017ApJ...843...16K.doi:10.3847/1538-4357/aa76db.ISSN 1538-4357.S2CID 119407480.
  5. ^"The Extragalactic Distance Database (EDD)".edd.ifa.hawaii.edu. Retrieved2022-04-22.
  6. ^"Nearby Groups of Galaxies".ned.ipac.caltech.edu. Retrieved2022-04-12.
  7. ^Gregory, Stephen A.; Thompson, Laird A. (1977-04-01)."The Coma i Galaxy Cloud".The Astrophysical Journal.213:345–350.Bibcode:1977ApJ...213..345G.doi:10.1086/155160.ISSN 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.201 (4):1021–1034.doi:10.1093/mnras/201.4.1021.ISSN 0035-8711.
  9. ^abElmegreen, Debra Meloy; Elmegreen, Bruce G. (March 1987)."Arm classifications for spiral galaxies".The Astrophysical Journal.314: 3.Bibcode:1987ApJ...314....3E.doi:10.1086/165034.ISSN 0004-637X.
  10. ^"Your NED Search Results".ned.ipac.caltech.edu. Retrieved2022-04-22.
  11. ^"Index Catalog Objects: IC 3300 - 3349".cseligman.com. Retrieved2022-04-22.
  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.450 (1):873–882.arXiv:1503.07635.doi:10.1093/mnras/stv668.ISSN 0035-8711.
  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.42 (1):603–683.arXiv:astro-ph/0407343.Bibcode:2004ARA&A..42..603K.doi:10.1146/annurev.astro.42.053102.134024.ISSN 0066-4146.S2CID 515479.
  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.441 (4):3570–3590.arXiv:1404.5956.doi:10.1093/mnras/stu797.ISSN 1365-2966.
  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.451 (1):859–869.arXiv:1505.01158.doi:10.1093/mnras/stv1012.ISSN 1365-2966.
  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.457 (2):2122–2138.arXiv:1601.02613.Bibcode:2016MNRAS.457.2122G.doi:10.1093/mnras/stw093.ISSN 0035-8711.

External links

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