NGC 855
Observation data
ConstellationTriangulum[1]
Right ascension02h 14m 03,5s[1]
Declination27° 52′ 38″[1]
Redshift0.001975±0.000017[1]
Heliocentric radial velocity592 ± 5 km/s[1]
Apparent magnitude (V)12,6[1]
Apparent magnitude (B)13,3[1]
Other designations
NGC 855 • UGC 1718 • PGC 8557 • CGCG 504-035 • MCG +05-06-016 • IRAS 02111+2738 • KUG 0211+276 • 2MASX J02140361+2752378 • CN 26 613

NGC 855 is a star-forming dwarf elliptical galaxy located in the Triangulum constellation.[2] The discovery and a first description (as H 26 613)[3] was realized by William Herschel on 26th October 1786 and the findings made public through his Catalogue of Nebulae and Clusters of Stars, published the same year.[4]

NGC 855's relative velocity to the cosmic microwave background is 343 ± 18 km/s (343 ± 18) km/s, corresponding to a Hubble distance of 5.06 ± 0.44 Mpc (∼16.5 million ly).[1] There is some uncertainty about its precise distance since two surface brightness fluctuation measurements give a distance of 9.280 ± 0.636 Mpc (∼30.3 million ly), a range outside the Hubble distance determined by the galaxy's redshift survey.[5]

Star formation

Using infrared data collected from two regions in the center of the galaxy by the Spitzer Space Telescope, astronomers were able to suggest NGC 855 to be a star-forming galaxy.[2] Its HI distribution (Neutral atomic hydrogen emission lines) suggests the star-forming activity might have been triggered by a minor merger.[2]

See also

References

  1. 1 2 3 4 5 6 7 8 "By Name | NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 2023-11-05.
  2. 1 2 3 Li, Sheng-Peng; Gu, Qiu-Sheng; Zhao, Ying-He; Huang, Jia-Sheng; Luo, Xin-Lian (2007). "A Study of the Star-forming Dwarf Galaxy NGC 855 with Spitzer". Chinese Journal of Astronomy and Astrophysics. 7 (6): 764. doi:10.1088/1009-9271/7/6/03. ISSN 1009-9271.
  3. ↑ "Catalogue of Nebulae and Clusters of Stars".
  4. ↑ "Herschel Catalog". www.messier.seds.org. Retrieved 2023-11-06.
  5. ↑ "NED Query Results for NGC 855". ned.ipac.caltech.edu. Retrieved 2023-11-06.
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