Messier 77
Spiral Galaxy M77 |
|
| Observation data: J2000 epoch | |
|---|---|
| Constellation: | Cetus |
| Right ascension: | 2h 42m 40.7s[1] |
| Declination: | -00° 00′ 48″[1] |
| Redshift: | 1137 ± 3 km/s[1] |
| Distance: | |
| Type: | (R)SA(rs)b[1] |
| Apparent dimensions (V): | 7′.1 × 6′.0[1] |
| Apparent magnitude (V): | 9.6[1] |
| Notable features: | One of the biggest galaxies of Messier's catalog. Inclination estimated to be 40°.[3] |
| Other designations | |
| M77, NGC 1068, UGC 2188, PGC 10266, Arp 37[1] | |
| See also: Galaxy, List of galaxies | |
Messier 77 (also known as NGC 1068) is a barred spiral galaxy about 47.0 million light-years away in the constellation Cetus. Messier 77 is an active galaxy with an Active Galactic Nucleus (AGN), which is obscured from view by astronomical dust at visible wavelengths. The diameter of the molecular disk and hot plasma associated with the obscuring material was first measured at radio wavelengths by the VLBA and VLA. The hot dust around the nucleus was subsequently measured in the mid-infrared by the MIDI instrument at the VLTI. It is a Seyfert 2 galaxy.[2]
History
Discovery
Messier 77 was discovered by Pierre Méchain in 1780, who originally described it as a nebula. Méchain then communicated his discovery to Charles Messier, who subsequently listed the object in his catalog[4]. Both Messier and William Herschel described this galaxy as a star cluster[4]. Today, however, the object is known to be a galaxy.
External links
- Spiral Galaxy M77 @ SEDS Messier pages
- VLBA image of the month: radio continuum and water masers of NGC 1068
- Press release about VLTI observations of NGC 1068
- WIKISKY.ORG: SDSS image M77
References
- ^ a b c d e f g NASA/IPAC Extragalactic Database. Results for NGC 1068. Retrieved on 2006-11-18.
- ^ a b Pattern Speeds BIMA-SONG Galaxies with Molecule-Dominated ISMs Using the Tremaine-Weinberg Method. Bland-Hawthorn et al. (1997). Retrieved on 2006-08-31.
- ^ Pattern Speeds BIMA-SONG Galaxies with Molecule-Dominated ISMs Using the Tremaine-Weinberg Method. (Schinnerer et al. 2000). Retrieved on 2006-08-31.
- ^ a b K. G. Jones (1991). Messier's Nebulae and Star Clusters, 2nd edition, Cambridge: Cambridge University Press. ISBN 0-521-37079-5.
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