NGC 4457 explained

NGC 4457
Epoch:J2000
Type:(R)SAB(s)0/a, LINER[1]
Dist Ly:54,801,600 ly
Group Cluster:Virgo II Groups
Z:0.002942
H Radial V:882 km/s
Appmag V:11.76
Size V:2.7 × 2.3
Constellation Name:Virgo
Names:CGCG 42-124, IRAS 12264+0350, MCG 1-32-75, PGC 41101, UGC 7609, VCC 1145
Size:~ 38,687.32 ly

NGC 4457 is an intermediate spiral galaxy located about 55 million light-years away[2] in the constellation of Virgo.[3] It is also classified as a LINER galaxy, a class of active galaxy defined by their spectral line emissions.[4] NGC 4457 Is inclined by about 33°.[5] It was discovered by astronomer William Herschel on February 23, 1784.[6] Despite being listed in the Virgo Cluster Catalog as VCC 1145,[7] NGC 4457 is a member of the Virgo II Groups[8] [9] [10] which form an extension of the Virgo cluster.[11]

NGC 4457 may have had a recent minor merger with another galaxy.[12]

On July 1 2020, an astronomical transient was discovered in NGC 4457 by astronomer Kiochi Itagaki and confirmed by ASAS-SN. Spectroscopic classification determined the object to be a Type Ia Supernova, SN 2020nvb.[13]

Physical characteristics

NGC 4457 has a broad oval zone containing an inner spiral which is defined mainly by two fairly open arms. There is a well-defined outer ring that is completely detached from the inner regions of the galaxy.[14]

Truncated disk

NGC 4457 has a severely reduced amount of star-formation in its disk while its inner regions have a normalized rate of massive star formation. This may have been caused by a recent interaction of the gas in the galaxy with the gas in the surrounding Virgo Cluster,[15] causing the gas to be stripped away in an effect known as ram-pressure stripping.[16]

See also

External links

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 4457 . 2017-08-18.
  2. Web site: Your NED Search Results. ned.ipac.caltech.edu. 2017-08-19.
  3. Web site: Galaxy NGC 4457 - Galaxy in Virgo Constellation · Deep Sky Objects Browser. Rojas. Sebastián García. DSO Browser. en. 2017-08-19.
  4. TERASHIMA. YUICHI. HO. LUIS C.. PTAK. ANDREW F.. MUSHOTZKY. RICHARD F.. SERLEMITSOS. PETER J.. YAQOOB. TAHIR. KUNIEDA. HIDEYO. 20 April 2000. ASCA Observations of "Type 2" LINERs: Evidence for a Stellar Source of Ionization. The Astrophysical Journal. 533. 2. 729–743. astro-ph/9911340 . 2000ApJ...533..729T . 10.1086/308690 . 14130773.
  5. Vollmer. B.. Soida. M.. Beck. R.. Chung. A.. Urbanik. M.. Chyzy. K.T.. Otmianowska-Mazur. K.. Kenney. J.D.P.. 4 April 2013. Large-scale radio continuum properties of 19 Virgo cluster galaxies⋆ The influence of tidal interactions, ram pressure stripping, and accreting gas envelopes. Astronomy & Astrophysics. 553. 38. 10.1051/0004-6361/201321163. 1304.1279 . 2013A&A...553A.116V . 119190841.
  6. Web site: New General Catalog Objects: NGC 4450 - 4499. cseligman.com. en-US. 2017-08-18.
  7. Binggeli. B.. Sandage. A.. Tammann. G. A.. September 1985. Studies of the Virgo Cluster. II - A catalog of 2096 galaxies in the Virgo Cluster area. V - Luminosity functions of Virgo Cluster galaxies. The Astronomical Journal. en. 90. 1681. 10.1086/113874. 0004-6256. 1985AJ.....90.1681B.
  8. Tully. R. B.. June 1982. The Local Supercluster. 1982ApJ...257..389T. The Astrophysical Journal. en. 257. 389–422. 10.1086/159999. 0004-637X. free.
  9. Koopmann. Rebecca A.. Kenney. Jeffrey D. P.. Young. Judith. 2001. An Atlas of Hα and R Images and Radial Profiles of 63 Bright Virgo Cluster Spiral Galaxies. The Astrophysical Journal Supplement Series. en. 135. 2. 125–154. 10.1086/323532. 0067-0049. astro-ph/0106335. 2001ApJS..135..125K. 14603109.
  10. Binggeli. B.. Popescu. C. C. Tammann. G. A.. April 11, 1993. The kinematics of the Virgo cluster revisited. Astronomy and Astrophysics Supplement Series. 98. 275–296. 1993A&AS...98..275B.
  11. Web site: The Virgo II Groups. www.atlasoftheuniverse.com. 2018-04-25.
  12. Vollmer. B.. Soida. M.. Beck. R.. Chung. A.. Urbanik. M.. Chyży. K. T.. Otmianowska-Mazur. K.. Kenney. J. D. P.. May 2013. Large-scale radio continuum properties of 19 Virgo cluster galaxies. Astronomy & Astrophysics. en. 553. A116. 10.1051/0004-6361/201321163. 0004-6361. 1304.1279. 2013A&A...553A.116V. 119190841.
  13. https://wis-tns.weizmann.ac.il/object/2020nvb SN 2020nvb TNS
  14. Web site: NGC 4457 - (R)SAB(s)a. The de Vaucouleurs Atlas of Galaxies. 2017-08-19.
  15. Cortes. Juan R.. Kenney. Jeffrey D. P.. Hardy. Eduardo. Integral-Field Stellar and Ionized Gas Kinematics of Peculiar Virgo Cluster Spiral Galaxies. 24 December 2014. The Astrophysical Journal Supplement Series. 216. 1. 9. 10.1088/0067-0049/216/1/9. 1411.3387. 2015ApJS..216....9C. 53658261.
  16. Web site: Robert A. Piontek -- Ram Pressure Stripping. www.aip.de. 2017-08-19. https://web.archive.org/web/20161016083535/http://www.aip.de/~rpiontek/ram.html. 2016-10-16. dead.

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