Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 699, Issue 2, Pages L169-L173Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/699/2/L169
Keywords
black hole physics; globular clusters: individual (M54); stellar dynamics
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Funding
- STFC [PP/C002229/1, ST/H004157/1, PP/E00105X/1, ST/H004165/1, ST/F001967/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H004157/1, ST/H004165/1, PP/E00105X/1, ST/F001967/1, PP/C002229/1] Funding Source: researchfish
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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(-1), decreasing to 16.4 +/- 0.4 km s(-1) 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 mass of similar to 9400 M-circle dot. 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.
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