NGC 5778

NGC 5778
The elliptical galaxy NGC 5778
Observation data (J2000 epoch)
ConstellationBoötes
Right ascension14h 54m 31.48s[1]
Declination+18° 38′ 32.50″[1]
Redshift0.059210[1]
Heliocentric radial velocity17,751 ± 5 km/s[1]
Distance881.5 ± 61.7 Mly (270.27 ± 18.92 Mpc)[1]
Group or clusterAbell 1991
Absolute magnitude (V)14.3[2]
Characteristics
TypecD;BrClG [1]
Size~364,000 ly (111.5 kpc) (estimated)[1]
Other designations
NGC 5825, UGC 9590, Abell 1991:[AAV2011] BCG, CGCG 105-066, GIN 372, PGC 53279, MCG +03-38-050[1]

NGC 5778 is a large elliptical galaxy in the constellation of Boötes. The galaxy has a redshift of (z) 0.059[1] 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.[3] It is the brightest cluster galaxy (BCG) of the galaxy cluster, Abell 1991 and as such dominates the center.[4][5]

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).[4][6] It also contains a core-jet structure based on a high resolution radio map with a linear size of 8 kiloparsecs.[7] A radio core has been detected and has a total flux density of 11.4 mJy.[5]

The optical spectrum of the galaxy displays emission lines.[8] 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.[9] 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.[4] 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 Mʘ per year derived from its infrared luminosity.[10] The stellar velocity dispersion is 279 ± 25 kilometers per second.[11]

References

  1. ^ a b c d e f g h i "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. ^ a b c 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. ^ a b 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. doi:10.1093/mnras/staf606. ISSN 0035-8711.
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