Messier 81
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| 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 | |
| Type | SA(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 | |
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
[eedit | eedit soorce]- ↑ 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)
- ↑ 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.
- ↑ 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.
- ↑ a b c d e f g h i j k "NASA/IPAC Extragalactic Database". Results for NGC 3031. Retrieved 10 November 2006.
- ↑ "SIMBAD-M81". SIMBAD Astronomical Database. Retrieved 28 November 2009.
- ↑ 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.
- ↑ "SIMBAD Astronomical Database". Results for NGC 3031. Retrieved 10 November 2006.
- ↑ 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)
- ↑ S. J. O'Meara (1998). The Messier Objects. Cambridge University Press. ISBN 0-521-55332-6.
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