NGC 5778

NGC 5778
The elliptical galaxy NGC 5778
Observation data (J2000 epoch)
ConstellationBoötes
Right ascension14h 54m 31.48s
Declination+18° 38′ 32.50″
Redshift0.059210
Heliocentric radial velocity17,751 ± 5 km/s
Distance881.5 ± 61.7 Mly (270.27 ± 18.92 Mpc)
Group or clusterAbell 1991
Absolute magnitude (V)14.3
Characteristics
TypecD;BrClG
Size~364,000 ly (111.5 kpc) (estimated)
Other designations
NGC 5825, UGC 9590, Abell 1991:[AAV2011] BCG, CGCG 105-066, GIN 372, PGC 53279, MCG +03-38-050

NGC 5778 is a large elliptical galaxy in the constellation of Boötes. The galaxy has a redshift of (z) 0.059 and it was first discovered by the American astronomer Lewis Swift in June 1886 who depicted it as faint and small, next to a star, and also discovered by the French astronomer Guillaume Bigourdan in May 1890. It is the brightest cluster galaxy (BCG) of the galaxy cluster, Abell 1991 and as such dominates the center.

Description

NGC 5778 is a type-cD galaxy of Abell 1991. It is a radio galaxy containing a compact central radio source with a low radio power of 23.41 W Hz−1 and a total radio flux density estimated as 38 mJy based on observations made with the Very Large Array (VLA). It also contains a core-jet structure based on a high resolution radio map with a linear size of 8 kiloparsecs. A radio core has been detected and has a total flux density of 11.4 mJy.

The optical spectrum of the galaxy displays emission lines. The U – R and U – I color gradients of the galaxy are estimated to be -0.35 ± 0.06 and -0.23 ± 0.08 magnitudes respectively. The X-ray emission extends outwards by 180 arcseconds, with further detections of X-ray knot features located in the northern direction from its nucleus. The galaxy also has a calculated central velocity dispersion of 222 ± 8 kilometers per second with a total star formation rate that is less than 1.66 M☉ per year derived from its infrared luminosity. The stellar velocity dispersion is 279 ± 25 kilometers per second.

References

  1. 1 2 3 4 5 6 7 8 9 "NED Search results for NGC 5778". NASA/IPAC Extragalactic Database. Retrieved 2026-05-29.
  2. ↑ "Revised NGC Data for NGC 5778". spider.seds.org. Retrieved 30 March 2024.
  3. ↑ "New General Catalog Objects: NGC 5750 - 5799". cseligman.com. Retrieved 2026-05-29.
  4. 1 2 3 Sharma, Mangala; McNamara, B. R.; Nulsen, P. E. J.; Owers, M.; Wise, M. W.; Blanton, E. L.; Sarazin, C. L.; Owen, F. N.; David, L. P. (2004-09-20). "A Chandra X-Ray Observation of A1991: The Late Stages of Infall?". The Astrophysical Journal. 613 (1): 180–188. arXiv:astro-ph/0405336. Bibcode:2004ApJ...613..180S. doi:10.1086/422866. ISSN 0004-637X.
  5. 1 2 Hogan, M. T.; Edge, A. C.; Hlavacek-Larrondo, J.; Grainge, K. J. B.; Hamer, S. L.; Mahony, E. K.; Russell, H. R.; Fabian, A. C.; McNamara, B. R. (2015-07-10). "A comprehensive study of the radio properties of brightest cluster galaxies". Monthly Notices of the Royal Astronomical Society. 453 (2): 1201–1222. arXiv:1507.03019v1. doi:10.1093/mnras/stv1517.
  6. ↑ Owen, Frazer N.; Ledlow, Michael J. (January 1997). "A 20 Centimeter VLA Survey of Abell Clusters of Galaxies. VII. Detailed Radio Images". The Astrophysical Journal Supplement Series. 108 (1): 41–98. Bibcode:1997ApJS..108...41O. doi:10.1086/312954. ISSN 0067-0049.
  7. ↑ Feretti, L.; Giovannini, G. (January 1994). "Structures of small-size radio galaxies in clusters". Astronomy and Astrophysics. 281: 375–387. Bibcode:1994A&A...281..375F.
  8. ↑ Crawford, C. S.; Allen, S. W.; Ebeling, H.; Edge, A. C.; Fabian, A. C. (1999-07-11). "The ROSAT Brightest Cluster Sample -- III. Optical spectra of the central cluster galaxies". Monthly Notices of the Royal Astronomical Society. 306 (4): 857–896. arXiv:astro-ph/9903057. Bibcode:1999MNRAS.306..857C. doi:10.1046/j.1365-8711.1999.02583.x. ISSN 0035-8711.
  9. ↑ Rafferty, David; McNamara, Brian; Nulsen, Paul (2008-02-13). "The Regulation of Cooling and Star Formation in Luminous Galaxies by Active Galactic Nucleus Feedback and the Cooling-Time/Entropy Threshold for the Onset of Star Formation". The Astrophysical Journal. 687 (2): 899–918. arXiv:0802.1864v2. Bibcode:2008ApJ...687..899R. doi:10.1086/591240.
  10. ↑ Pulido, F. A.; McNamara, B. R.; Edge, A. C.; Hogan, M. T.; Vantyghem, A. N.; Russell, H. R.; Nulsen, P. E. J.; Babyk, I.; Salomé, P. (2018-02-01). "The Origin of Molecular Clouds in Central Galaxies". The Astrophysical Journal. 853 (2): 177. arXiv:1710.04664. Bibcode:2018ApJ...853..177P. doi:10.3847/1538-4357/aaa54b. ISSN 0004-637X.
  11. ↑ Ríos-López, Emmanuel; López-Cruz, Omar; Añorve, Christopher; Valerdi, Mabel; Dufrane, Victoria R; Rodríguez-Hernández, Erick A (2025-04-25). "2D surface brightness modelling of large 2MASS galaxies II: the role of classical bulges and pseudobulges on galaxy scaling relations and its implication for supermassive black hole formation". Monthly Notices of the Royal Astronomical Society. 539 (3): 2583–2607. arXiv:2502.02546. doi:10.1093/mnras/staf606. ISSN 0035-8711.