NGC 5474
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| NGC 5474 | |
|---|---|
 An ultraviolet image of NGC 5474 taken with GALEX. | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major[1] |
| Right ascension | 14h 05m 01.6s[2] |
| Declination | +53° 39′ 44″[2] |
| Redshift | 273 ± 9 km/s[2] |
| Distance | 21.2 ± 2.2 Mly (6.5 ± 0.7 Mpc)[2] |
| Type | SA(s)cd pec[2] |
| Apparent dimensions (V) | 4′.8 × 4′.3[2] |
| Apparent magnitude (V) | 11.3[2] |
| Other designations | |
| UGC 9013,[2] PGC 50216[2] | |
| See also: Galaxy, List of galaxies | |
NGC 5474 is a peculiar dwarf galaxy in the constellation Ursa Major. It is one of several companion galaxies of the Pinwheel Galaxy (M101), a grand-design spiral galaxy.[3][4] Among the Pinwheel Galaxy's companions, this galaxy is the closest to the Pinwheel Galaxy itself.[3] The gravitational interaction between NGC 5474 and the Pinwheel Galaxy have strongly distorted the galaxy. As a result, the disk is offset relative to the nucleus.[3][5] The star formation in this galaxy (as traced by hydrogen spectral line emission) is also offset from the nucleus.[5] NGC 5474 shows some signs of a spiral structure. As a result, this galaxy is often classified as a dwarf spiral galaxy, a relative rare group of dwarf galaxies.
References
- ↑ R. W. Sinnott, editor (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. ISBN 0-933346-51-4.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 "NASA/IPAC Extragalactic Database". Results for NGC 5474. Retrieved 2006-09-20.
- ↑ 3.0 3.1 3.2 Drozdovsky, I. O; Karachentsev, I. D (2000). "Photometric distances to six bright resolved galaxies". Astronomy and Astrophysics Supplement 142 (3): 425–432. Bibcode:2000A&AS..142..425D. doi:10.1051/aas:2000155.
- ↑ A. Sandage, J. Bedke (1994). Carnegie Atlas of Galaxies. Washington, D.C.: Carnegie Institution of Washington. ISBN 0-87279-667-1.
- ↑ 5.0 5.1 R. M. Gonzalez Delgado, E. Perez, C. Tadhunter J. M. Vilchez, J. M. Rodriguez-Espinosa (2000). "H II Region Population in a Sample of Nearby Galaxies with Nuclear Activity. I. Data and General Results". Astrophysical Journal Supplement 108 (1): 155. Bibcode:1997ApJS..108..155G. doi:10.1086/312951.
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