NGC 855

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NGC 855
NGC855 - SDSS DR14.jpg
Observation data (J2000 epoch)
Constellation Triangulum [1]
Right ascension 02h 14m 03.4946s [1]
Declination 27° 52′ 37.966″ [1]
Redshift 0.001975±0.000017 [1]
Heliocentric radial velocity 592 ± 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 26 October 1786 and the findings made public through his Catalogue of Nebulae and Clusters of Stars, published the same year. [4]

Contents

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

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References

  1. 1 2 3 4 5 6 7 8 "By Name | NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 5 November 2023.
  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. Bibcode:2007ChJAA...7..764L. 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 6 November 2023.
  5. ↑ "NED Query Results for NGC 855". ned.ipac.caltech.edu. Retrieved 6 November 2023.
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