Astronomy:NGC 2775

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NGC 2775
A galaxy seen face-on, with a slightly elliptical disc that appears to have a hole in the centre like a doughnut. In the hole, the core is a brightly glowing point that shines light out beyond the edge of the disc. Around the hole is an inner ring of dust, and at the galaxy’s edge is a thicker outer ring of dust, with a swirling web of dust strands in between. Blue stars and red nebulae are visible behind the dust.
NGC 2775 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationCancer
Right ascension 09h 10m 20.112s[1]
Declination+07° 02′ 16.53″[1]
Redshift0.004500±0.00000334[2]
Helio radial velocity1,316.4±13.4 km/s[3]
Distance67 Mly (20.5 Mpc)[4]
Apparent magnitude (V)10.4[5]
Characteristics
TypeSAa[6] or SA(r)ab[7]
Size~79,000 ly (24.23 kpc) (estimated)[2]
Apparent size (V)4.3′ × 3.3′[7]
Other designations
IRAS 09076+0714, UGC 4820, MCG+01-24-005, PGC 25861[8][2]

NGC 2775, also known as Caldwell 48, is a spiral galaxy in the constellation Cancer. It is 67 million light-years (20.5 megaparsecs)[4] away from the Milky Way. It was discovered by German-British astronomer William Herschel on 19 December 1783.[9][10]

This object has a morphological classification of SA(r)ab,[7] which indicates an unbarred spiral galaxy (SA) with a prominent ring structure (r) and flocculent,[11] tightly wound spiral arms (ab).[12] The galaxy is inclined by an angle of 44° to the line of sight from the Earth.[7] The galactic nucleus is not active[3] and the large nuclear bulge, which extends out to an angular radius of 0.4′,[12] is relatively gas free.[11] An explanation for the latter could be a high supernova rate.[7] Although star formation is taking place in the dusty outer ring,[12] NGC 2775 does not display any current starburst activity,[13] and the galactic nucleus is virtually free of any star formation whatsoever.[11]

The galaxy's hydrogen tail feature indicates a past interaction with a faint companion.[7] A satellite galaxy appears to have orbited NGC 2775 multiple times, losing mass as it did so and creating faint, shell-like structures.[12] Nearby irregular galaxy NGC 2777 displays a tidal tail of hydrogen gas that points back to NGC 2775, suggesting the two may be linked.[14]

Cluster and group membership

NGC 2775 belongs to the Antlia-Hydra Cluster[15] of galaxies and is the most prominent member of the NGC 2775 Group (also known as LGG 169), a small galaxy group in the Virgo Super-cluster, along with the Local Group. Other members of the NGC 2775 Group include NGC 2777 and UGC 4781.[16][17]

Supernova

One supernova has been observed in NGC 2775. SN 1993Z (Type Ia, mag. 13.9) was discovered by the Leuschner Observatory Supernova Search (LOSS) on 23 September 1993.[18][19] By September 25, spectral analysis showed that it had peaked about four weeks earlier.[18]

  • NGC 2775 imaged with a 32-inch telescope.
    NGC 2775 imaged with a 32-inch telescope.
  • Map showing the location of NGC 2775.
    Map showing the location of NGC 2775.
  • NGC 2775 (SDSS DR14)
    NGC 2775 (SDSS DR14)
  • NGC 2775 from the Hubble Space Telescope
    NGC 2775 from the Hubble Space Telescope

See also

References

  1. ↑ 1.0 1.1 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S. 
  2. ↑ 2.0 2.1 2.2 "Results for object NGC 2775". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+2775. 
  3. ↑ 3.0 3.1 van den Bosch, Remco C. E. et al. (May 2015). "Hunting for Supermassive Black Holes in Nearby Galaxies With the Hobby-Eberly Telescope". The Astrophysical Journal Supplement Series 218 (1): 13. doi:10.1088/0067-0049/218/1/10. 10. Bibcode: 2015ApJS..218...10V. 
  4. ↑ 4.0 4.1 Cappellari, Michele et al. (May 2011). "The ATLAS3D project - I. A volume-limited sample of 260 nearby early-type galaxies: science goals and selection criteria". Monthly Notices of the Royal Astronomical Society 413 (2): 813–836. doi:10.1111/j.1365-2966.2010.18174.x. Bibcode: 2011MNRAS.413..813C. 
  5. ↑ Finlay, Warren H. (2014). Concise Catalog of Deep-sky Objects. The Patrick Moore Practical Astronomy Series (2nd ed.). Springer Science & Business Media. p. 227. ISBN 978-3-319-03169-9. 
  6. ↑ Ann, H. B. et al. (2015). "A Catalog of Visually Classified Galaxies in the Local (z ~ 0.01) Universe". The Astrophysical Journal Supplement Series 217 (2): 27–49. doi:10.1088/0067-0049/217/2/27. Bibcode: 2015ApJS..217...27A. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Hogg, David E. et al. (March 2001). "Hot and Cold Gas in Early-Type Spirals: NGC 3623, NGC 2775, and NGC 1291". The Astronomical Journal 121 (3): 1336–1357. doi:10.1086/319400. Bibcode: 2001AJ....121.1336H. 
  8. ↑ "NGC 2775". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+2775. 
  9. ↑ Herschel, William (1786). "Catalogue of One Thousand New Nebulae and Clusters of Stars". Philosophical Transactions of the Royal Society of London 76: 457–499. doi:10.1098/rstl.1786.0027. Bibcode: 1786RSPT...76..457H. https://zenodo.org/record/1432282/files/article.pdf. 
  10. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 2775". https://cseligman.com/text/atlas/ngc27a.htm#2775. 
  11. ↑ 11.0 11.1 11.2 "Hubble Spots Feathered Spiral". NASA. 2020-07-02. https://www.nasa.gov/image-feature/goddard/2020/hubble-spots-feathered-spiral. 
  12. ↑ 12.0 12.1 12.2 12.3 König, Michael; Binnewies, Stefan (2017). The Cambridge Photographic Atlas of Galaxies. Cambridge University Press. p. 35. ISBN 978-1107189485. https://books.google.com/books?id=JY0wDwAAQBAJ&pg=PA35. 
  13. ↑ Shapiro, Kristen L. et al. (December 2003). "Observational Constraints on Disk Heating as a Function of Hubble Type". The Astronomical Journal 126 (6): 2707–2716. doi:10.1086/379306. Bibcode: 2003AJ....126.2707S. 
  14. ↑ Arp, Halton; Sulentic, Jack W. (July 1991). "The Properties of NGC 2777: Are Companion Galaxies Young?". Astrophysical Journal 375: 569. doi:10.1086/170218. Bibcode: 1991ApJ...375..569A. 
  15. ↑ O'Meara, Stephen James; Moore, Patrick (2002). The Caldwell objects (2nd ed.). Sky Publishing Corporation. p. 192. ISBN 0521827965. https://books.google.com/books?id=3Hg6YHgx9nAC&pg=PA192. 
  16. ↑ "A List of Nearby Galaxy Groups". Atlas of the Universe. http://www.atlasoftheuniverse.com/galaclus.html. 
  17. ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series 100: 47. Bibcode: 1993A&AS..100...47G. 
  18. ↑ 18.0 18.1 Treffers, R. R.; Filippenko, A. V.; Leibundgut, B.; Paik, Y.; Lee, L. F. M.; Richmond, M. W. (1993). "Supernova 1993Z in NGC 2775". International Astronomical Union Circular (5870): 3. Bibcode: 1993IAUC.5870....3T. http://www.cbat.eps.harvard.edu/iauc/05800/05870.html#Item3. 
  19. ↑ "SN 1993Z". IAU. https://www.wis-tns.org/object/1993Z. 



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