Astronomy:NGC 4589

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NGC 4589
NGC 4589 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationDraco
Right ascension 12h 37m 24.9875s[1]
Declination+74° 11′ 30.903″[1]
Redshift0.006617[2]
Helio radial velocity2,002 km/s[3]
Galactocentric velocity2,154 km/s[3]
Distance73.03 ± 0.46 Mly (22.39 ± 0.14 Mpc)[3]
Apparent magnitude (V)10.73±0.15[4]
Apparent magnitude (B)11.69±0.15[4]
Absolute magnitude (V)−21.41±0.23[4]
Characteristics
TypeE2[4]
Apparent size (V)3.47′ × 2.75′[5]
Other designations
IRAS F12353+7428, NGC 4589, UGC 7797[6]

NGC 4589 is an elliptical galaxy located in the Draco constellation.[7][8][9] It was discovered by German-British astronomer William Herschel on November 22, 1797. This galaxy lies at a distance of 73.0 million light-years (22.39 Mpc) from the Milky Way, and is receding with a heliocentric radial velocity of 2,002 km/s.[3] It is known by its designations PGC 42139 or UGC 7797.[6]

The morphological classification of NGC 4589 is E2 in the De Vaucouleurs system, Indicating this is an elliptical galaxy with a ratio of 5:4 between the major and minor axes. It is a bright source of X-ray emission and is a LINER-type galaxy. There is a dusty disk that is aligned with the minor axis, which is likely the remnant of a merger with a gas-rich galaxy. NGC 4589 has a large population of globular clusters, estimated at 640±50. A small population of young star clusters with an age of less than a billion years are located in the central region.[4]

The calcium-rich type Ib supernova SN 2005cz was discovered on July 28, 2005.[10][11] The progenitor star may have formed near the young stellar clusters at the core of NGC 4589.[4]

References

  1. ↑ 1.0 1.1 Myers, S. T. et al. (2003). "The Cosmic Lens All-Sky Survey - I. Source selection and observations". Monthly Notices of the Royal Astronomical Society 341 (1): 1–12. doi:10.1046/j.1365-8711.2003.06256.x. Bibcode: 2003MNRAS.341....1M. 
  2. ↑ Kochanek, C. S. et al. (October 2001). "The K-Band Galaxy Luminosity Function". The Astrophysical Journal 560 (2): 566–579. doi:10.1086/322488. Bibcode: 2001ApJ...560..566K. 
  3. ↑ 3.0 3.1 3.2 3.3 Tully, R. Brent et al. (October 2013). "Cosmicflows-2: The Data". The Astronomical Journal 146 (4): 25. doi:10.1088/0004-6256/146/4/86. 86. Bibcode: 2013AJ....146...86T. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Lee, Myung Gyoon et al. (January 2019). "Star Clusters in the Elliptical Galaxy NGC 4589 Hosting a Calcium-rich SN Ib (SN 2005cz)". The Astrophysical Journal 871 (1): id. 33. doi:10.3847/1538-4357/aaf72c. Bibcode: 2019ApJ...871...33L. 
  5. ↑ Paturel, G. et al. (December 2003). "HYPERLEDA. I. Identification and designation of galaxies". Astronomy and Astrophysics 412: 45–55. doi:10.1051/0004-6361:20031411. Bibcode: 2003A&A...412...45P. https://hal-insu.archives-ouvertes.fr/insu-02774412/file/aa3772.pdf. 
  6. ↑ 6.0 6.1 "NGC 4589". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+4589. 
  7. ↑ "Compass and Scale Image of Galaxies NGC 2768 and NGC 4589". HubbleSite. http://hubblesite.org/contents/media/images/2015/28/3616-Image. 
  8. ↑ Lee, M.; Jang, In; Kang, Jisu (2018-12-04). "Star Clusters in the Elliptical Galaxy NGC 4589 Hosting a Calcium-rich SN Ib (SN 2005CZ)". https://www.researchgate.net/publication/329441641. 
  9. ↑ Kawabata, K. S. et al. (2010-05-20). "A massive star origin for an unusual helium-rich supernova in an elliptical galaxy". Nature 465 (7296): 326–328. doi:10.1038/nature09055. PMID 20485430. Bibcode: 2010Natur.465..326K. 
  10. ↑ Leonard, D. C. (August 2005). Green, D. W. E.. ed. "Supernova 2005cz in NGC 4589". IAU Circular (8579): 2. Bibcode: 2005IAUC.8579....2L. 
  11. ↑ "SN 2005cz". IAU. https://www.wis-tns.org/object/2005cz. 



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