NGC 3198

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NGC 3198
NGC3198 - Iotw2035a.jpg
NGC 3198 imaged by the Nicholas U. Mayall Telescope
Observation data (J2000 epoch)
Constellation Ursa Major
Right ascension 10h 19m 55.0022s [1]
Declination +45° 32′ 59.337″ [1]
Redshift 0.00227 [2]
Distance 47 Mly [3]
Apparent magnitude  (V)10.3 [4]
Characteristics
Type SB(rs)c [4]
Size~121,800  ly (37.33  kpc) (estimated) [1]
Apparent size  (V)8.5′ × 3.3′ [4]
Other designations
IRAS 10168+4548, UGC 5572, MCG +08-19-020, PGC 30197, CGCG 240-030 [2]

NGC 3198, also known as Herschel 146 [5] is a barred spiral galaxy in the constellation Ursa Major. It was discovered by German-British astronomer William Herschel on 15 January 1788. [6] [3] NGC 3198 is located in the Leo Spur, [3] which is part of the Virgo Supercluster, [7] and is approximately 47 million light years away. [3]

Contents

NGC 3198 was one of 18 galaxies targeted by the Hubble Space Telescope (HST) Key Project on the Extragalactic Distance Scale, which aimed to calibrate various secondary distance indicators and determine the Hubble constant to an accuracy of 10%. The type and orientation of NGC 3198 made it suitable for these measurements. [8] The Wide Field and Planetary Camera 2 (WFPC2) of the HST was used to measure the magnitudes of 52 Cepheid variables, and the resulting distance modulus corresponded to a distance of 14.5 Mpc (47 million light years). [8]

Observations made with the Westerbork Synthesis Radio Telescope detected for the first time the presence of extraplanar gas. [9] The extraplanar gas makes up approximately 15% of the total atomic hydrogen (HI) mass of the galaxy. [9]

Supernovae

Two supernovae have been observed in NGC 3198:

See also

References

  1. 1 2 3 "Results for object NGC 3198". NASA/IPAC Extragalactic Database. NASA and Caltech . Retrieved 14 December 2024.
  2. 1 2 "NGC 3198". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 5 July 2015.
  3. 1 2 3 4 5 O'Meara, Stephen James (2011). Deep-Sky Companions: The Secret Deep, Volume 4. Photographs by Mario Motta. Cambridge University Press. pp. 186–188. ISBN   978-1-139-50007-4.
  4. 1 2 3 Bratton, Mark (2011). The Complete Guide to the Herschel Objects. Cambridge University Press. p. 440. ISBN   978-0-521-76892-4.
  5. ↑ Clark, Maurice. "Herschel 146 / NGC 3198". Herschel 400 List Objects. Retrieved 2017-01-25.
  6. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 3198". Celestial Atlas. Retrieved 31 August 2024.
  7. ↑ Monks, Neale (2010). Go-To Telescopes Under Suburban Skies. Springer. p. 53. ISBN   978-1-4419-6851-7.
  8. 1 2 Kelson, Daniel (1999). "The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XIX. The Discovery of Cepheids in and a New Distance to NGC 3198". The Astrophysical Journal . 514 (2): 614–636. Bibcode:1999ApJ...514..614K. doi: 10.1086/306989 .
  9. 1 2 Gentile, G. (2013). "HALOGAS: Extraplanar gas in NGC 3198". Astronomy & Astrophysics . 554: A125. arXiv: 1304.4232 . Bibcode:2013A&A...554A.125G. doi:10.1051/0004-6361/201321116. S2CID   56047203.
  10. ↑ "SN 1966J". Transient Name Server. IAU . Retrieved 31 August 2024.
  11. ↑ Gingerich, Owen (22 December 1966). "Circular No. 1986". Central Bureau for Astronomical Telegrams. Smithsonian Astrophysical Observatory. Retrieved 2 December 2024.
  12. ↑ Li, W. D. (1999). "Possible Supernova in NGC 3198". International Astronomical Union Circular (7149): 1. Bibcode:1999IAUC.7149....1L.
  13. ↑ Filippenko, A. V.; Li, W. D.; Modjaz, M. (1999). "Supernova 1999bw in NGC 3198". International Astronomical Union Circular (7152): 2. Bibcode:1999IAUC.7152....2F.
  14. ↑ Bishop, David. "Supernova 1999bw in NGC 3198". Astronomy Section Rochester Academy of Science. Retrieved 25 January 2017.
  15. ↑ Ransome, C. L.; Habergham-Mawson, S. M.; Darnley, M. J.; James, P. A.; Filippenko, A. V.; Schlegel, E. M. (2021). "A systematic reclassification of Type IIn supernovae". Monthly Notices of the Royal Astronomical Society. 506 (4): 4715–4734. arXiv: 2107.02179 . doi: 10.1093/mnras/stab1938 .
  16. ↑ "AT 1999bw". Transient Name Server. IAU . Retrieved 31 August 2024.
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