HCG 87

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HCG 87
HCG 87.png
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.

Contents

Members

Members of the HCG 87
Name Type [5] R.A. (J2000) [5] Dec. (J2000) [5] Redshift (km/s) [5] Apparent Magnitude [5]
HCG 87a S0 pec20h 48m 15.0s−19° 50′ 58″8443 ± 1415.3
HCG 87b SA(r)0 pec20h 48m 10.9s−19° 51′ 23″8740 ± 2015.4
HCG 87c Sb20h 48m 12.0s−19° 49′ 56″8914 ± 716.1
HCG 87d Sd20h 48m 12.8s−19° 50′ 46″10200 ± 16017.8

References

  1. 1 2 3 "NASA/IPAC Extragalactic Database". Results for HCG 87. Retrieved 2006-10-19.
  2. ↑ "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. PS File download need Photoshop or GIMP
  3. ↑ Noll, Keith. 07/1999. "Hubble Heritage observations of Hickson Compact Galaxy Group 87".
  4. ↑ 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.
  5. 1 2 3 4 5 "NASA/IPAC Extragalactic Database". Results for various galaxies. Retrieved 2006-10-19.
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