Journal
ASTRONOMICAL JOURNAL
Volume 135, Issue 6, Pages 2350-2357Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/135/6/2350
Keywords
galaxies : individual (NGC 4636); galaxies : kinematics and dynamics; galaxies : star clusters; globular clusters : general
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Funding
- Science and Technology Facilities Council [PP/E001203/1] Funding Source: researchfish
- STFC [PP/E001203/1] Funding Source: UKRI
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We present the density structure of dark matter in the outer parts ( to about seven effective radii) of the elliptical galaxy NGC 4636, from the radial velocities of 174 globular clusters (GCs), using the non-parametric, inverse algorithm CHASSIS. We find the galaxy to be rich in dark matter, with R-band mass-to-light ratios (M/L) rising to about 30, at nearly 4R(e); the K-band M/L at about 3R(e) is found to be nearly 10. The result does not depend on applying the method to the red and blue GCs separately. This estimate of M/L is higher than the previous analysis from the same kinematic data. We also find that the dark-matter distribution is highly concentrated toward the inner halo.
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