Messier 81

Messier 81[1][2]
A Hubble Space Telescope (HST) image
o Messier 81
Observation data
Epoch J2000
Constellation Ursa Major[3]
Richt ascension 09h 55m 33.2s[4]
Declination +69° 3′ 55″[4]
Apparent dimension (V) 26.9 × 14.1 moa[4]
Apparent magnitude (V)6.94[5][6]
Characteristics
TypeSA(s)ab,[4] LINER[4]
Astrometry
Helio Radial velocity -34 ± 4[4]km/s
Reidshift -0.000113 ± 0.000013[4]
Galactocentric Velocity 73 ± 6[4] km/s
Distance 11.8 ± 0.4 Mly (3.62 ± 0.12 Mpc)
Other designations
NGC 3031,[4] UGC 5318,[4] PGC 28630,[4] Bode's Galaxy[7]

Messier 81 (kent as NGC 3031 or Bode's Galaxy an aw) is a spiral galaxy aboot 12 million licht-years away in the constellation Ursa Major. Due tae its proximity tae Yird, lairge size an active galactic nucleus (which harbors a 70 million M☉[8] supermassive black hole), Messier 81 haes been studied extensively bi professional astronomers. The galaxy's lairge size an relatively heicj brightness mak it a popular target for amateur astronomers an aw.[9]

References

  1. ↑ Jensen, Joseph B.; Tonry, John L.; Barris, Brian J.; Thompson, Rodger I.; Liu, Michael C.; Rieke, Marcia J.; Ajhar, Edward A.; Blakeslee, John P. (2003). "Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations". Astrophysical Journal. 583 (2): 712–726. arXiv:astro-ph/0210129. Bibcode:2003ApJ...583..712J. doi:10.1086/345430.CS1 maint: multiple names: authors leet (link)
  2. ↑ I. D. Karachentsev, O. G. Kashibadze (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics. 49 (1): 3–18. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6.
  3. ↑ R. W. Sinnott, ed. (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation / Cambridge University Press. ISBN 0-933346-51-4.
  4. ↑ a b c d e f g h i j k "NASA/IPAC Extragalactic Database". Results for NGC 3031. Retrieved 10 November 2006.
  5. ↑ "SIMBAD-M81". SIMBAD Astronomical Database. Retrieved 28 November 2009.
  6. ↑ Armando, Gil de Paz; Boissier; Madore; Seibert; Boselli; et al. (2007). "The GALEX Ultraviolet Atlas of Nearby Galaxies". Astrophysical Journal. 173 (2): 185–255. arXiv:astro-ph/0606440. Bibcode:2007ApJS..173..185G. doi:10.1086/516636.
  7. ↑ "SIMBAD Astronomical Database". Results for NGC 3031. Retrieved 10 November 2006.
  8. ↑ N. Devereux, H. Ford, Z. Tsvetanov, and J. Jocoby (2003). "STIS Spectroscopy of the Central 10 Parsecs of M81: Evidence for a Massive Black Hole". Astronomical Journal. 125 (3): 1226–1235. Bibcode:2003AJ....125.1226D. doi:10.1086/367595.CS1 maint: multiple names: authors leet (link)
  9. ↑ S. J. O'Meara (1998). The Messier Objects. Cambridge University Press. ISBN 0-521-55332-6.

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