THE DISTRIBUTION OF DARK MATTER IN THE HALO OF THE EARLY-TYPE GALAXY NGC 4636

2008/04/01 by Dalia Chakrabarty, Somak Raychaudhury · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Dark galaxy #Dark matter #Dark matter halo #Galactic halo #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy rotation curve #Globular cluster #Halo #Scientific Research and Discoveries #Type-cD galaxy #astro-ph

paper · pdf · doi:10.1088/0004-6256/135/6/2350

accepted for publication in AJ; 8 pages, 6 figures

arxiv created 2008/04/01 · openalex publication_date 2008/05/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

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 4 R e ; the K -band M / L at about 3 R 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.

Citations

• The Globular Cluster System of NGC 1399. I. A Wide-Field Photometric Study
• The Group Evolution Multiwavelength Study (GEMS): bimodal luminosity functions in galaxy groups
• Lost and found dark matter in elliptical galaxies
• The spatial structure of the M87 globular cluster system
• Greatly Extended X-Ray Emission around the Elliptical Galaxy NGC 4636 Observed with [ITAL]ASCA[/ITAL]
• Massive Elliptical Galaxies: From Cores to Halos
• The group evolution multiwavelength study: the near-infrared luminosity function of nearby galaxy groups
• An Inverse-Problem Approach to Cluster Dynamics
• The globular cluster kinematics and galaxy dark matter content of NGC 4649 (M60)

Cited by

• A COMBINED LOW-RADIO FREQUENCY/X-RAY STUDY OF GALAXY GROUPS. I. GIANT METREWAVE RADIO TELESCOPE OBSERVATIONS AT 235 MHz AND 610 MHz
• THE GLOBULAR CLUSTER SYSTEM OF THE VIRGO GIANT ELLIPTICAL GALAXY NGC 4636. II. KINEMATICS OF THE GLOBULAR CLUSTER SYSTEM

Related

• The Nature of Dark Matter in Elliptical Galaxies: Chandra X-ray Observatory Observations of NGC 4636
• The Intriguing Distribution of Dark Matter in Galaxies
• The Distribution of Dark Matter in Galaxies: Constant-Density Dark Halos\n Envelop the Stellar Disks
• The Distribution of Dark Matter in Galaxies: the Core Radius Issue
• Dark matter in early-type spiral galaxies: the case of NGC 2179 and of NGC 2775