Edge Rewrite
pun Source code View original
Jump to content

// Workers AI · dad joke modeWhat did NGC 2997 say to its date? You're a galaxy of fun.

Coordinates: Sky map 09h 45m 38.8s, −31° 11′ 28″
From Wikipedia, the free encyclopedia
(Redirected from UGCA 181)
NGC 2997
NGC 2997
Observation data (J2000 epoch)
ConstellationAntlia
Right ascension09h 45m 38.75379s[1]
Declination−31° 11′ 27.3570″[1]
Heliocentric radial velocity1,088±2 km/s[2]
Distance39.8 megalight-years (12.2 Mpc)[3]
Group or clusterNGC 2997 group
Apparent magnitude (V)10.1[2]
Characteristics
TypeSAB(rs)c[4] or Sc(s)I.3[5]
Size120,000 ly (36.65 kpc) (estimated)[2]
Apparent size (V)8′.9 × 6′.8[2]
Other designations
ESO 434-35, AM 0943-305, NGC 2997[6], UGCA 181, MCG -05-23-012, PGC 27978 [2]

NGC 2997 is a face-on unbarred spiral galaxy about 40[3] million light-years away in the faint southern constellation of Antlia.[3] It was discovered by German-born astronomer William Herschel on 4 March 1793. J. L. E. Dreyer described it as, "a remarkable object, very faint, very large, very gradually then very suddenly bright middle and 4 arcsec nucleus.[7] This is the brightest galaxy of the NGC 2997 group of galaxies, and was featured on the cover of the first edition of Galactic Dynamics by James Binney and Scott Tremaine.[8]

This is a grand-design galaxy with a symmetrical, two-armed form.[5] The morphological classification of NGC 2997 is SAB(rs)c,[4] indicating a weakly-barred spiral galaxy (SAB) with an incomplete ring around the bar (rs) and loosely-wound spiral arms (c). It is inclined at an angle of 40° to the line of sight from the Earth, with the major axis aligned along a position angle of 110°.[9] The arms host a series of dusty knots that are star-forming regions being generated through gas compression from density waves.[5] At the core, the arms converge to form a circumnuclear ring with symmetrically-placed hot spots containing super star clusters.[4]

Supernovae

[edit]

Two supernovae have been detected in NGC 2997.

  • SN 2003jg (Type Ib/c, mag. 17) was discovered by the Perth Automated Supernova Search using CCD images taken on 24 October 2003.[10][11] The supernova was positioned 11″ east and 6″ north of the galactic nucleus.[12]
  • SN 2008eh (type unknown, mag. 15.1) was discovered by Berto Monard [it] on 21 July 2008, reaching maximum magnitude 15.0.[13][14] It was positioned 123″ east and 34″ north of the galactic core.

See also

[edit]

References

[edit]
  1. 1 2 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 5 "NASA/IPAC Extragalactic Database". Results for NGC 2997. Retrieved 2006-11-25.
  3. 1 2 3 Hess, K. M.; et al. (2009). "Anomalous HI in NGC 2997". The Astrophysical Journal. 699 (1): 76–88. arXiv:0904.3494v1. Bibcode:2009ApJ...699...76H. doi:10.1088/0004-637X/699/1/76. S2CID 17931955.
  4. 1 2 3 Elmegreen, Debra Meloy; et al. (August 1999). "Near-Infrared Observations of Hot Spots in the Circumnuclear Rings of NGC 2997 and NGC 6951". The Astronomical Journal. 118 (2): 777–784. Bibcode:1999AJ....118..777E. doi:10.1086/300970.
  5. 1 2 3 Grosbøl, P.; Dottori, H. (June 2009). "Pattern speed of main spiral arms in NGC 2997. Estimate based on very young stellar complexes". Astronomy and Astrophysics. 499 (3): L21–L24. arXiv:0904.4757. Bibcode:2009A&A...499L..21G. doi:10.1051/0004-6361/200911805. hdl:10183/99267.
  6. ↑ "NGC 2997". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-09-15.
  7. ↑ Seligman, Courtney. "NGC Objects: NGC 2950 - 2999". Celestial Atlas. Retrieved 2016-03-01.
  8. ↑ Binney, J.; Tremaine, S. "Galactic Dynamics". Princeton University Press. Archived from the original on 2007-04-20. Retrieved 2007-04-09.
  9. ↑ Ho, I. -Ting; et al. (October 2018). "Azimuthal variations of gas-phase oxygen abundance in NGC 2997". Astronomy & Astrophysics. 618: 13. arXiv:1807.02043. Bibcode:2018A&A...618A..64H. doi:10.1051/0004-6361/201833262. S2CID 53692123. A64.
  10. ↑ Martin, R.; Biggs, J. (October 2003). Green, D. W. E. (ed.). "Supernova 2003jg in NGC 2997". International Astronomical Union Circular (8235): 1. Bibcode:2003IAUC.8235....1M.
  11. ↑ "SN 2003jg". Transient Name Server. IAU. Retrieved 17 August 2026.
  12. ↑ Kuncarayakti, H.; et al. (May 2018). "Constraints on core-collapse supernova progenitors from explosion site integral field spectroscopy". Astronomy & Astrophysics. 613: 18. arXiv:1711.05765. Bibcode:2018A&A...613A..35K. doi:10.1051/0004-6361/201731923. S2CID 55845396. A35.
  13. ↑ Monard, L. A. G. (July 2008). Green, D. W. E. (ed.). "Supernova 2008eh in NGC 2997". Central Bureau Electronic Telegrams (1445): 1. Bibcode:2008CBET.1445....1M.
  14. ↑ "SN 2008eh". Transient Name Server. IAU. Retrieved 17 August 2026.
[edit]
Retrieved from "https://en.wikipedia.org/w/index.php?title=NGC_2997&oldid=1372952697"