| HCG 87 | |
|---|---|
 Galaxy Group HCG 87 | |
| Observation data (Epoch ) | |
| Constellation(s) | Capricornus |
| Right ascension | 20h 48m 11.9ss[1] |
| Declination | −19° 50′ 35″[1] |
| Number of galaxies | ~5 |
| Redshift | 8874 km/s[1] |
| Distance | 400 million |
HCG 87 is a compact group of galaxies listed in the Hickson Compact Group Catalogue. This group is about 400 million light-years away [2] in the constellation Capricornus. The group distinguishes itself as one of the most compact groups of galaxies, hosting two active galactic nuclei and a starburst among its three members, all of which show signs of interaction.[3] This interaction, which astronomers have called visually, and scientifically, intriguing[4] is being examined to understand the influence of active nuclei on star formation histories.
- ^ a b c "NASA/IPAC Extragalactic Database". Results for HCG 87. Retrieved 2006-10-19.
- ^ "This redshift corresponds to a distance of 120Mpc or 400 million light years (using H0 = 75km/s/Mpc and q0 = 0.1). At the distance of the group, this corresponds to a group diameter of 52kpc, i.e., the group is approximately 170,000 light years across". Archived from the original on 19 February 2020.
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- ^ Noll, Keith. 07/1999. "Hubble Heritage observations of Hickson Compact Galaxy Group 87".
- ^ English, J. et al. 05/2000. "A Minuet of Galaxies: Hickson Compact Group 87 as Viewed by the Hubble Space Telescope". American Astronomical Society, 195th AAS Meeting, #136.04; Bulletin of the American Astronomical Society, Vol. 32, p.884.