|Barred spiral galaxy M109|
|Right ascension||11h 57m 36.0s|
|Declination||+53° 22′ 28″|
|Apparent dimension (V)||7.6 × 4.7 moa|
|Apparent magnitude (V)||10.6|
|Heliocentric radial velocity||1048 ± 1 km/s|
|Redshift||0.003496 ± 0.000004|
|Galactocentric velocity||1121 ± 3 km/s|
|Distance||83.5 ± 24 Mly (25.60 ± 7.36 Mpc)|
|SIMBAD||Search M109 data
|See also: Galaxy, List of galaxies|
Messier 109 (also known as NGC 3992) is a barred spiral galaxy exhibiting a weak inner ring structure around the central bar approximately 83.5 ± 24 million light-years away in the northern constellation Ursa Major. M109 can be seen south-east of the star Phecda (γ UMa, Gamma Ursa Majoris).
Between the 1920s through the 1950s, it was considered that Messier objects over 103 were not official, but later the additions, further referred target objects from Méchain, became more widely accepted. David H. Levy mentions the modern 110 object catalog while Sir Patrick Moore places the limit at 104 objects but has M105 to 109 listed as addenda. By the late 1970s all 110 objects are commonly used among astronomers and remain so.
This galaxy by far the most distant object in the Messier Catalog, followed by M91.
M109 has three satellite galaxies (UGC 6923, UGC 6940 and UGC 6969) and possibly more. Detailed hydrogen line observations have been obtained from M109 and its satellites. M109's H I (H one) distribution is regular with a low-level radial extension outside the stellar disc, while in the bar is a central H I hole in the gas distribution. Possibly the gas has been transported inwards by the bar, and because of the emptiness of the hole no large accretion events can have happened in the recent past.
- NGC 1300 – a similar barred spiral galaxy
- Kaufmann, D.E.; Contopoulos, G. (1996). "Self-consistent models of barred spiral galaxies". Astronomy & Astrophysics. 309: 381–402. Bibcode:1996A&A...309..381K.
- "NASA/IPAC Extragalactic Database". Results for M 109. Retrieved 2006-10-10.
- It is also by far the most distant object in the Messier Catalog, followed by M91 "Distance Results for MESSIER 109". NASA/IPAC Extragalactic Database. Retrieved 2010-05-02.
- Bottema, Roelof; Verheijen (2002). "Dark and luminous matter in the NGC 3992 group of galaxies". Astronomy and Astrophysics. 388 (3): 793. arXiv:astro-ph/0204335. Bibcode:2002A&A...388..793B. doi:10.1051/0004-6361:20020539. S2CID 119374710.
- R. B. Tully (1988). Nearby Galaxies Catalog. Cambridge University Press. ISBN 978-0-521-35299-4.
- P. Fouque; E. Gourgoulhon; P. Chamaraux; G. Paturel (1992). "Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members". Astronomy and Astrophysics Supplement. 93: 211–233. Bibcode:1992A&AS...93..211F.
- A. Garcia (1993). "General study of group membership. II - Determination of nearby groups". Astronomy and Astrophysics Supplement. 100: 47–90. Bibcode:1993A&AS..100...47G.
- G. Giuricin; C. Marinoni; L. Ceriani; A. Pisani (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups". Astrophysical Journal. 543 (1): 178–194. arXiv:astro-ph/0001140. Bibcode:2000ApJ...543..178G. doi:10.1086/317070. S2CID 9618325.
|Wikimedia Commons has media related to Messier 109.|
- "Messier 109". SEDS. Retrieved 2005-08-11.
- Messier 109 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images