Speedway

NGC 4487

NGC 4487
NGC 4487 imaged by Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationVirgo
Right ascension12h 31m 04.4322s[1]
Declination−08° 03′ 14.110″[1]
Redshift0.003456 ± 0.000007 [1]
Heliocentric radial velocity1,036 ± 2 km/s[1]
Distance55.3 ± 15.8 Mly (16.9 ± 4.8 Mpc)[1]
Group or clusterVirgo II Groups
Apparent magnitude (V)11.0[2]
Characteristics
TypeSAB(rs)cd [1]
Size~67,000 ly (20.6 kpc) (estimated)[1]
Apparent size (V)4.2′ × 2.8′ [1]
Other designations
IRAS 12285-0746, MCG -01-32-021, PGC 41399[1]

NGC 4487 is a spiral galaxy in the constellation Virgo. The galaxy lies about 55 million light years away from Earth, which means, given its apparent dimensions, that NGC 4487 is approximately 65,000 light years across.[1] It was discovered by William Herschel on March 23, 1789.[3]

Characteristics

NGC 4487 has an elliptical bulge with a small bar. The nucleus is offset from the centre. The galaxy has faint diffuse spiral arms.[4] Two spiral arms can be discerned with a grand design pattern. Dust lanes are visible along the inner regions of the arms. One arm branches into several broad segments. Many HII regions are visible in the disk, the largest of which are more than 3 arcseconds across.[5]

Based on its X-ray emission the nucleus of the galaxy appears to be active.[6] In the centre of the galaxy lies a supermassive black hole, whose mass is estimated to be 106.46 ± 0.63 (0.6 - 12 million) M☉, based on the pitch angle of the spiral arms.[7] The stars of the galaxy appear to be of intermediate-young age and have very low metallicity.[8] The star formation rate is estimated to be 0.4 M☉ per year.[9]

Supernova

One supernova has been observed in NGC 4487, SN 2009N. It was discovered on 24 January 2009 by Koichi Itagaki at an apparent magnitude of 16.6, located 75" east and 18" north of the center of NGC 4487.[10] It was identified as a type II supernova.[11] More detailed spectral observations categorised it as a type II-P, created by the collapse of red supergiant or a yellow supergiant.[12]

Nearby galaxies

NGC 4487 forms a pair with NGC 4504, which lies 35 arcminutes away.[5] NGC 4487 is a member of the Messier 104 Group, which also includes the Sombrero Galaxy (M104), NGC 4504, UGCA 287, and UGCA 289.[13] A. M. Garcia considers the galaxy part of the LGG 293 Group, in which are included the galaxies NGC 4487, NGC 4504, and NGC 4597.[14] It is part of a Virgo II Groups, a chain of groups extending from the Virgo Cluster.[15]

  • NGC 4487 by Legacy Surveys
    NGC 4487 by Legacy Surveys

References

  1. ^ a b c d e f g h i j "Results for object NGC 4487". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 25 February 2025.
  2. ^ "Revised NGC Data for NGC 4487". spider.seds.org. Retrieved 30 March 2024.
  3. ^ Seligman, Courtney. "NGC 4487 (= PGC 41399)". Celestial Atlas. Retrieved 19 November 2018.
  4. ^ Eskridge, Paul B.; Frogel, Jay A.; Pogge, Richard W.; Quillen, Alice C.; Berlind, Andreas A.; Davies, Roger L.; DePoy, D. L.; Gilbert, Karoline M.; Houdashelt, Mark L.; Kuchinski, Leslie E.; Ramirez, Solange V.; Sellgren, K.; Stutz, Amelia; Terndrup, Donald M.; Tiede, Glenn P. (November 2002). "Near-Infrared and Optical Morphology of Spiral Galaxies". The Astrophysical Journal Supplement Series. 143 (1): 73–111. arXiv:astro-ph/0206320. Bibcode:2002ApJS..143...73E. doi:10.1086/342340.
  5. ^ a b Sandage, A., Bedke, J. (1994), The Carnegie Atlas of Galaxies. Volume I, Carnegie Institution of Washington
  6. ^ Foord, Adi; Gallo, Elena; Hodges-Kluck, Edmund; Miller, Brendan P.; Baldassare, Vivienne F.; Gültekin, Kayhan; Gnedin, Oleg Y. (20 May 2017). "AGN Activity in Nucleated Galaxies as Measured by Chandra". The Astrophysical Journal. 841 (1): 51. arXiv:1704.03882. Bibcode:2017ApJ...841...51F. doi:10.3847/1538-4357/aa6d63.
  7. ^ Davis, Benjamin L.; Berrier, Joel C.; Johns, Lucas; Shields, Douglas W.; Hartley, Matthew T.; Kennefick, Daniel; Kennefick, Julia; Seigar, Marc S.; Lacy, Claud H. S. (20 June 2014). "The Black Hole Mass Function Derived from Local Spiral Galaxies". The Astrophysical Journal. 789 (2): 124. arXiv:1405.5876. Bibcode:2014ApJ...789..124D. doi:10.1088/0004-637X/789/2/124. S2CID 119302157.
  8. ^ Ganda, Katia; Peletier, Reynier F.; McDermid, Richard M.; Falcón-Barroso, Jesús; De Zeeuw, P. T.; Bacon, Roland; Cappellari, Michele; Davies, Roger L.; Emsellem, Eric; Krajnović, Davor; Kuntschner, Harald; Sarzi, Marc; Van De Ven, Glenn (September 2007). "Absorption-line strengths of 18 late-type spiral galaxies observed with SAURON". Monthly Notices of the Royal Astronomical Society. 380 (2): 506–540. arXiv:0706.3624. Bibcode:2007MNRAS.380..506G. doi:10.1111/j.1365-2966.2007.12121.x.
  9. ^ Baldassare, Vivienne F.; Stone, Nicholas C.; Foord, Adi; Gallo, Elena; Ostriker, Jeremiah P. (1 April 2022). "Massive Black Hole Formation in Dense Stellar Environments: Enhanced X-Ray Detection Rates in High-velocity Dispersion Nuclear Star Clusters". The Astrophysical Journal. 929 (1): 84. arXiv:2203.02517. Bibcode:2022ApJ...929...84B. doi:10.3847/1538-4357/ac5f51.
  10. ^ Nakano, S.; Kadota, K.; Buzzi, L. (25 January 2009). "Supernova 2009N in NGC 4487". Central Bureau Electronic Telegrams (1670): 1.
  11. ^ Challis, P.; Berlind, P. (26 January 2009). "Supernova 2009N in NGC 4487". Central Bureau Electronic Telegrams (1671): 1.
  12. ^ Takáts, K.; et al. (11 February 2014). "SN 2009N: linking normal and subluminous Type II-P SNe". Monthly Notices of the Royal Astronomical Society. 438 (1): 368–387. arXiv:1311.2525. doi:10.1093/mnras/stt2203.
  13. ^ Makarov, Dmitry; Karachentsev, Igor (21 April 2011). "Galaxy groups and clouds in the local (z~ 0.01) Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. arXiv:1011.6277. Bibcode:2011MNRAS.412.2498M. doi:10.1111/j.1365-2966.2010.18071.x. S2CID 119194025. Retrieved 1 February 2025.
  14. ^ Garcia, A. M. (1 July 1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47–90. Bibcode:1993A&AS..100...47G. ISSN 0365-0138.
  15. ^ "The Virgo II Groups". www.atlasoftheuniverse.com. Retrieved 25 February 2025.
Quelle: https://en.wikipedia.org/wiki/NGC_4487