Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-06-26
Astrophys.J.699:L169-L173,2009
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Accepted for publication by The Astrophysical Journal (Letters). Latex. 5 pages, 4 color figures, 2 with reduced resolution, o
Scientific paper
10.1088/0004-637X/699/2/L169
We report the detection of a stellar density cusp and a velocity dispersion increase in the center of the globular cluster M54, located at the center of the Sagittarius dwarf galaxy (Sgr). The central line of sight velocity dispersion is 20.2 +/- 0.7 km/s, decreasing to 16.4 +/- 0.4 km/s at 2.5" (0.3 pc). Modeling the kinematics and surface density profiles as the sum of a King model and a point-mass yields a black hole (BH) mass of ~ 9400 M_sun. However, the observations can alternatively be explained if the cusp stars possess moderate radial anisotropy. A Jeans analysis of the Sgr nucleus reveals a strong tangential anisotropy, probably a relic from the formation of the system.
Bellazzini Michele
Chapman Sandra C.
Dalessandro Emanuele
Ferraro Francesco R.
Ibata Rodrigo
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