The total mass of the early-type galaxy NGC 4649 (M60)

Abstract

In this paper we analyze the problem of the total mass and the total mass-to-light ratio of the early-type galaxy NGC 4649 (M60). We have used two independent techniques: the X-ray methodology which is based on the temperature of the X-ray halo of NGC 4649 and the tracer mass estimator (TME) which uses globular clusters (GCs) observed in this galaxy. We calculated the mass in Newtonian and MOdified Newtonian Dynamics (MOND) approaches and found that interior to 3 effective radii (Re) there is no need for large amounts of dark matter. Beyond 3Re dark matter starts to play important dynamical role. We also discuss possible reasons for the discrepancy between the estimates of the total mass based on X-rays and TME in the outer regions of NGC 4649.

Accepted by Serbian Astronomical Journal, 8 pages, 1 figure

References in corpus (5)

• Insight into the baryon-gravity relation in galaxies
• X-ray Group and cluster mass profiles in MOND: Unexplained mass on the group scale
• The Hot Interstellar Medium of Normal Elliptical Galaxies. I. A Chandra Gas Gallery and Comparison of X-ray and Optical Morphology
• Spatially Resolved Stellar Kinematics of Field Early-Type Galaxies at z=1: Evolution of the Rotation Rate
• The Globular Cluster System of M60 (NGC 4649). I. CFHT MOS Spectroscopy and Database