NGC 2775
NGC 2775 as taken by Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationCancer
Right ascension09h 10m 20.112s[1]
Declination+07° 02′ 16.53″[1]
Redshift1,316.4±13.4 km/s[2]
Distance67 Mly (20.5 Mpc)[3]
Apparent magnitude (V)10.4[4]
Characteristics
TypeSAa[5] or SA(r)ab[6]
Apparent size (V)4.3′ × 3.3′[6]
Other designations
UGC 4820,[7] PGC 25861,[8] Caldwell 48

NGC 2775, also known as Caldwell 48, is a spiral galaxy in the constellation Cancer. It is 67 million light-years (20.5 megaparsecs)[3] away from the Milky Way. It was discovered by William Herschel in 1783. NGC 2775 belongs to the Antlia-Hydra Cluster[9] of galaxies and is the most prominent member of the NGC 2775 Group, 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.[10]

This object has a morphological classification of SA(r)ab,[6] 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.[6] The galactic nucleus is not active[2] 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.[6] 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.[6] A satellite galaxy appears to have orbited NGC 2775 multiple times, losing mass as it does 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]

SN1993z is the only supernova known to have occurred in NGC 2775. It was detected on September 23, 1993, at a magnitude of 13.9, and was classified as a Type Ia supernova.[15] By September 25, spectral analysis showed that it had peaked four weeks earlier.[16]

References

  1. 1 2 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.
  2. 1 2 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. arXiv:1502.00632. Bibcode:2015ApJS..218...10V. doi:10.1088/0067-0049/218/1/10. S2CID 117876537. 10.
  3. 1 2 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. arXiv:1012.1551. Bibcode:2011MNRAS.413..813C. doi:10.1111/j.1365-2966.2010.18174.x. S2CID 15391206.
  4. ↑ 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.
  5. ↑ 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. arXiv:1502.03545. Bibcode:2015ApJS..217...27A. doi:10.1088/0067-0049/217/2/27. S2CID 119253507.
  6. 1 2 3 4 5 6 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. Bibcode:2001AJ....121.1336H. doi:10.1086/319400.
  7. ↑ "NGC 2775". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-04-19.
  8. ↑ "NASA/IPAC Extragalactic Database". Results for NGC 2775. Retrieved 2010-03-24.
  9. ↑ O'Meara, Stephen James; Moore, Patrick (2002). The Caldwell objects (2nd ed.). Sky Publishing Corporation. p. 192. ISBN 0521827965.
  10. ↑ "A List of Nearby Galaxy Groups". Atlas of the Universe. Retrieved 2010-11-28.
  11. 1 2 3 "Hubble Spots Feathered Spiral". NASA. 2020-07-02. Retrieved 2020-07-03.
  12. 1 2 3 4 König, Michael; Binnewies, Stefan (2017). The Cambridge Photographic Atlas of Galaxies. p. 35. ISBN 978-1107189485.
  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. arXiv:astro-ph/0308489. Bibcode:2003AJ....126.2707S. doi:10.1086/379306. S2CID 15388910.
  14. ↑ Arp, Halton; Sulentic, Jack W. (July 1991). "The Properties of NGC 2777: Are Companion Galaxies Young?". Astrophysical Journal. 375: 569. Bibcode:1991ApJ...375..569A. doi:10.1086/170218.
  15. ↑ "List of Supernovae". IAU Central Bureau for Astronomical Telegrams. Retrieved 2012-01-10.
  16. ↑ "IAUC 5870: N Lup 1993; 1993Y; 1993Z". IAU Central Bureau for Astronomical Telegrams. Retrieved 2015-11-23.
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