NGC 5474

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NGC 5474
A dwarf galaxy ravaged by grand design.jpg
Hubble image of NGC 5474. [1]
Observation data (J2000 epoch)
Constellation Ursa Major [2]
Right ascension 14h 05m 01.6s [3]
Declination +53° 39′ 44″ [3]
Redshift 273 ± 9 km/s [3]
Distance 21.2 ± 2.2 Mly (6.5 ± 0.7 Mpc) [3]
Apparent magnitude  (V)11.3 [3]
Characteristics
Type SA(s)cd pec [3]
Size27,500 ly (8.43 kpc) (estimated) [3]
Apparent size  (V)4.8′ × 4.3′ [3]
Other designations
UGC 9013, [3] PGC 50216 [3]

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. [4] [5] Among the Pinwheel Galaxy's companions, this galaxy is the closest to the Pinwheel Galaxy itself. [4] The gravitational interaction between NGC 5474 and the Pinwheel Galaxy has strongly distorted the former. As a result, the disk is offset relative to the nucleus. [4] [6] The star formation in this galaxy (as traced by hydrogen spectral line emission) is also offset from the nucleus. [6] NGC 5474 shows some signs of a spiral structure. As a result, this galaxy is often classified as a dwarf spiral galaxy, a relatively rare group of dwarf galaxies.

Contents

See also

References

  1. ↑ "A dwarf galaxy ravaged by grand design". Picture of the Week. ESA/Hubble. Retrieved 17 June 2014.
  2. ↑ 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 and Cambridge University Press. ISBN   978-0-933346-51-2.
  3. 1 2 3 4 5 6 7 8 9 10 "NASA/IPAC Extragalactic Database". Results for NGC 5474. Retrieved 2006-09-20.
  4. 1 2 3 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 .
  5. ↑ A. Sandage; J. Bedke (1994). Carnegie Atlas of Galaxies. Washington, D.C.: Carnegie Institution of Washington. ISBN   978-0-87279-667-6.
  6. 1 2 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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