Help Reference Information

Refcode

Title	Associations of Dwarf Galaxies
Authors	Tully, R. Brent; Rizzi, L.; Dolphin, A. E.; Karachentsev, I. D.; Karachentseva, V. E.; Makarov, D. I.; Makarova, L.; Sakai, S.; Shaya, E. J.
Bibcode	2006AJ....132..729T Search ADS ↗
Abstract	The Hubble Space Telescope Advanced Camera for Surveys has been used to determine accurate distances for 20 galaxies from measurements of the luminosity of the brightest red giant branch stars. Five associations of dwarf galaxies that had originally been identified based on strong correlations on the plane of the sky and in velocity are shown to be equally well correlated in distance. Two more associations with similar properties have been discovered. Another association is identified that is suggested to be unbound through tidal disruption. The associations have the spatial and kinematic properties expected of bound structures with (1-10)×10¹¹ M_solar. However, these entities have little light, with the consequence that the mass-to-light ratios are in the range 100-1000 M_solar L^-1_solar. Within a well-surveyed volume extending to a 3 Mpc radius, all but one known galaxy lie within one of the groups or associations that have been identified.
Objects	41 Objects Search NED ↙

You are here