Astronomy:NGC 3621

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NGC 3621
NGC 3621 taken by the Wide Field Imager (WFI) at ESO's La Silla Observatory
Observation data (J2000 epoch)
ConstellationHydra
Right ascension 11h 18m 16.5109s[1]
Declination–32° 48′ 49.732″[1]
Redshift0.002403[1]
Helio radial velocity720 ± 0 km/s[1]
Distance21.7 million light years (6.64 Mpc)[2]
Apparent magnitude (V)9.56[3]
Characteristics
TypeSA(s)d[4]
Mass2 × 1010[4] M☉
Size~216,900 ly (66.49 kpc) (estimated)[1]
Apparent size (V)10.96′ × 4.79′[3]
Other designations
ESO 377- G 037, IRAS 11158-3232, MCG-05-27-008, PGC 34554[3][1]

Coordinates: Sky map 11h 18m 16.5109s, −32° 48′ 49.732″

NGC 3621 is a disk spiral galaxy about 22 Mly (6.7 Mpc) away[2][5] in the equatorial constellation of Hydra. It was discovered by German-British astronomer William Herschel on 17 February 1790.[6][7]

NGC 3621 is comparatively bright and can be well seen in moderate-sized telescopes. The galaxy is around 216,900 ly (66,500 pc)[1] across and is inclined at an angle of 66° from being viewed face on.[8] It shines with a luminosity equal to 13 billion times that of the Sun.[9] The morphological classification is SA(s)d,[4] which indicates this is an ordinary spiral with loosely wound arms.[10] There is no evidence for a bulge.[11] Although it appears to be isolated,[10] NGC 3621 belongs to the Leo spur.[9]

This galaxy has an active nucleus that matches a Seyfert 2 optical spectrum, suggesting that a low mass supermassive black hole is present at the core. Based upon the motion of stars in the nucleus, this object may have a mass of up to three million times the mass of the Sun.[11]

Supernova

NGC 3621, with SN 2024ggi marked

One supernova has been observed in NGC 3621: SN 2024ggi (Type II, mag. 18.915) was discovered by ATLAS on 11 April 2024.[12] By 16 April it had brightened to magnitude 12, and got as bright as magnitude 11.9, making it the brightest supernova of 2024.[13] It was the closest supernova to Earth since SN 2023ixf, which had been discovered on 19 May 2023. A search of archival Hubble Space Telescope and Spitzer Space Telescope images showed the suspected progenitor star, identified as a red supergiant.[14] The mass of the progenitor has been estimated at 12-15 M☉.[15]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "Results for object NGC 3621". NASA and Caltech. http://ned.ipac.caltech.edu/byname?objname=NGC+3621. 
  2. ↑ 2.0 2.1 Tully, R. Brent et al. (March 2008), "Our Peculiar Motion Away from the Local Void", The Astrophysical Journal 676 (1): 184–205, doi:10.1086/527428, Bibcode: 2008ApJ...676..184T. 
  3. ↑ 3.0 3.1 3.2 "NGC 3621". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+3621. 
  4. ↑ 4.0 4.1 4.2 Bresolin, Fabio; Kennicutt, Robert C.; Ryan-Weber (May 2012), "Gas Metallicities in the Extended Disks of NGC 1512 and NGC 3621. Chemical Signatures of Metal Mixing or Enriched Gas Accretion?", The Astronomical Journal 750 (2): 122, doi:10.1088/0004-637X/750/2/122, Bibcode: 2012ApJ...750..122B. 
  5. ↑ Materne, J. (April 1979). "The structure of nearby groups of galaxies - Quantitative membership probabilities". Astronomy and Astrophysics 74 (2): 235–243. Bibcode: 1979A&A....74..235M. 
  6. ↑ Herschel, W. (1802). "Catalogue of 500 New Nebulae, Nebulous Stars, Planetary Nebulae, and Clusters of Stars; with Remarks on the Construction of the Heavens". Philosophical Transactions of the Royal Society of London 92: 477–528. doi:10.1098/rstl.1802.0021. Bibcode: 1802RSPT...92..477H. 
  7. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 3621". https://cseligman.com/text/atlas/ngc36.htm#3621. 
  8. ↑ Lang, Philipp (July 2020), "PHANGS CO Kinematics: Disk Orientations and Rotation Curves at 150 pc Resolution", The Astrophysical Journal 897 (2): 122, doi:10.3847/1538-4357/ab9953, Bibcode: 2020ApJ...897..122L. 
  9. ↑ 9.0 9.1 O'Meara, Stephen James (2013), Deep-Sky Companions: Southern Gems, Cambridge University Press, p. 203, ISBN 978-1107015012, Bibcode: 2013dcsg.book.....O, https://books.google.com/books?id=S5QIEKns33sC&pg=PA203. 
  10. ↑ 10.0 10.1 Buta, Ronald J.; Corwin, Harold G.; Odewahn, Stephen C. (2007), Atlas of Galaxies, Cambridge University Press, pp. 13–17, ISBN 978-0521820486, https://books.google.com/books?id=g-P7dCbB5MEC&pg=PA16. 
  11. ↑ 11.0 11.1 Barth, Aaron J.; Strigari, Louis E.; Bentz, Misty C.; Greene, Jenny E.; Ho, Luis C. (January 2009), "Dynamical Constraints on the Masses of the Nuclear Star Cluster and Black Hole in the Late-Type Spiral Galaxy NGC 3621", The Astronomical Journal 690 (1): 1031–1044, doi:10.1088/0004-637X/690/1/1031, Bibcode: 2009ApJ...690.1031B. 
  12. ↑ "SN 2024ggi". IAU. https://www.wis-tns.org/object/2024ggi. 
  13. ↑ Bishop, David. "Bright Supernovae - 2024". https://www.rochesterastronomy.org/sn2024/index.html. 
  14. ↑ Xiang, Danfeng; Mo, Jun; Wang, Xiaofeng; Wang, Lingzhi; Zhang, Jujia; Lin, Han; Chen, Liyang; Song, Cuiying et al. (2024). "The Red Supergiant Progenitor of Type II Supernova 2024ggi". The Astrophysical Journal 969 (1): L15. doi:10.3847/2041-8213/ad54b3. Bibcode: 2024ApJ...969L..15X. 
  15. ↑ Ferrari, L.; et al. (2025). "The nebular phase of SN 2024ggi: A low-mass progenitor with no signs of interaction". arXiv:2507.22794 [astro-ph.SR].
  16. ↑ "A special spiral galaxy for over 200 000 Facebook fans". Hubble Space Telescope – Picture of the Week. https://www.spacetelescope.org/images/potw1341a/. 
  17. ↑ "A galaxy full of surprises — NGC 3621 is bulgeless but has three central black holes". European Southern Observatory – Picture of the Week. https://www.eso.org/public/images/potw1148a/. 

Template:NGC objects:3001-4000



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