Astronomy:NGC 6209

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NGC 6209
NGC 6209 imaged by DSS
Observation data (J2000 epoch)
ConstellationApus
Right ascension 16h 54m 57.6600s[1]
Declination−72° 35′ 11.900″[1]
Redshift0.019564±0.0000330[1]
Helio radial velocity5,865±10 km/s[1]
Distance247.90 ± 5.50 Mly (76.008 ± 1.685 Mpc)[1]
Apparent magnitude (V)11.41[1]
Characteristics
Type(R')SA(rs)bc[1]
Size~222,300 ly (68.17 kpc) (estimated)[1]
Apparent size (V)2.0′ × 1.6′[1]
Other designations
ESO 043- G 008, IRAS 16489-7230, PGC 59252[1]

NGC 6209 is a spiral galaxy in the constellation of Apus. Its velocity with respect to the cosmic microwave background is 5,916±11 km/s, which corresponds to a Hubble distance of 284.6 ± 19.9 Mly (87.26 ± 6.11 Mpc).[1] However, 13 non-redshift measurements give a closer mean distance of 247.90 ± 5.50 Mly (76.008 ± 1.685 Mpc).[2] It was discovered by British astronomer John Herschel on 28 June 1835.[3]

NGC 6209 is a Seyfert II galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.[4][5] Additionally, NGC 6209 has a possible active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.[6][5]

Supernovae

Two supernovae have been observed in NGC 6209:

  • SN 1998cx (Type Ia, mag. 17.8) was discovered by Alexander Wassilieff on 4 July 1998.[7][8]
  • SN 2009fz (Type IIb, mag. 16.5) was discovered by the CHilean Automatic Supernova sEarch (CHASE) on 8 June 2009.[9][10]

See also

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object NGC 6209". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+6209. 
  2. ↑ "Distance Results for NGC 6209". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+6209. 
  3. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 6209". https://cseligman.com/text/atlas/ngc62.htm#6209. 
  4. ↑ Chen, Yan-Ping; Zaw, Ingyin; Farrar, Glennys R.; Elgamal, Sana (2022). "A Uniformly Selected, Southern-sky 6dF, Optical AGN Catalog". The Astrophysical Journal Supplement Series 258 (2): 29. doi:10.3847/1538-4365/ac4157. Bibcode: 2022ApJS..258...29C. 
  5. ↑ 5.0 5.1 "NGC 6209". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6209. 
  6. ↑ Asmus, D.; Greenwell, C. L.; Gandhi, P.; Boorman, P. G.; Aird, J.; Alexander, D. M.; Assef, R. J.; Baldi, R. D. et al. (2020). "Local AGN survey (LASr): I. Galaxy sample, infrared colour selection, and predictions for AGN within 100 MPC". Monthly Notices of the Royal Astronomical Society 494 (2): 1784. doi:10.1093/mnras/staa766. Bibcode: 2020MNRAS.494.1784A. 
  7. ↑ Wassilieff, A.; Nankivell, G. (1998). "Supernova 1998cx in NGC 6209". International Astronomical Union Circular (6970): 1. Bibcode: 1998IAUC.6970....1W. http://www.cbat.eps.harvard.edu/iauc/06900/06970.html#Item1. 
  8. ↑ "SN 1998cx". IAU. https://www.wis-tns.org/object/1998cx. 
  9. ↑ Pignata, G.; Maza, J.; Hamuy, M.; Antezana, R.; Gonzalez, L.; Gonzalez, P.; Lopez, P.; Silva, S. et al. (2009). "Supernova 2009fz in NGC 6209". Central Bureau Electronic Telegrams (1838): 1. Bibcode: 2009CBET.1838....1P. http://www.cbat.eps.harvard.edu/cbet/001800/CBET001838.txt. 
  10. ↑ "SN 2009fz". IAU. https://www.wis-tns.org/object/2009fz. 

Coordinates: Sky map 16h 54m 57.6600s, −72° 35′ 11.900″



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