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Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 2350-2357 |
| Number of pages | 8 |
| Journal | The Astronomical Journal |
| Volume | 135 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1 Jan 2008 |
Keywords
- galaxies : individual (NGC 4636)
- globular clusters : general
- galaxies : star clusters
- galaxies : kinematics and dynamics
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Birmingham Astrophysics - Rolling Grant 2007-2012
Ponman, T. (Principal Investigator), Cruise, M. (Co-Investigator), Freise, A. (Co-Investigator), Raychaudhury, S. (Co-Investigator), Smith, G. (Co-Investigator), Speake, C. (Co-Investigator), Stevens, I. (Co-Investigator) & Vecchio, A. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/04/07 → 31/03/12
Project: Research Councils