HCG 87
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.
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 pec |
20h 48m 15.0s |
−19° 50′ 58″ |
8443 ± 14 |
15.3 |
HCG 87b |
SA(r)0 pec |
20h 48m 10.9s |
−19° 51′ 23″ |
8740 ± 20 |
15.4 |
HCG 87c |
Sb |
20h 48m 12.0s |
−19° 49′ 56″ |
8914 ± 7 |
16.1 |
HCG 87d |
Sd |
20h 48m 12.8s |
−19° 50′ 46″ |
10200 ± 160 |
17.8 |
External links
References
- ↑ 1.0 1.1 "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.
- ↑ 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.
- ↑ 5.0 5.1 5.2 5.3 5.4 "NASA/IPAC Extragalactic Database". Results for various galaxies. Retrieved 2006-10-19.
Coordinates:
20h 48m 11.9s, −19° 50′ 35″