The total mass of the early-type galaxy NGC 4649 M60 - AstrophysicsReport as inadecuate

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Abstract: In this paper we analyze the problem of the total mass and the totalmass-to-light ratio of the early-type galaxy NGC 4649 M60. We have used twoindependent techniques: the X-ray methodology which is based on the temperatureof the X-ray halo of NGC 4649 and the tracer mass estimator TME which usesglobular clusters GCs observed in this galaxy. We calculated the mass inNewtonian and MOdified Newtonian Dynamics MOND approaches and found thatinterior to 3 effective radii Re there is no need for large amounts of darkmatter. Beyond 3Re dark matter starts to play important dynamical role. We alsodiscuss possible reasons for the discrepancy between the estimates of the totalmass based on X-rays and TME in the outer regions of NGC 4649.

Author: S. Samurovic, M. M. Cirkovic



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