Globular cluster kinematics and X-ray emission in the early-type galaxy NGC 1399

被引：0
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作者：
Samurović, S. [1 ,2 ,3 ]
Danziger, I.J. [2 ]
机构：
[1] Dipartimento di Astronomia, Università di Trieste, via Tiepolo 11, 34131 Trieste, Italy
[2] INAF, Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, Italy
[3] Astronomical Observatory, Volgina 7, 11160 Belgrade, Yugoslavia
来源：
Astronomy and Astrophysics | 1600年 / 458卷 / 01期
关键词：
Context. Of the various observational methods used to address the question of dark matter in early-type galaxies there is the possibility of spatial overlap in using kinematics of stars; clusters and X-ray halos. Aims. To investigate methods for the determination of velocity distribution profiles and deviations from a Gaussian distribution using globular clusters in early-type galaxies; and the implications for dark matter. Methods. The maximum likelihood method together with standard statistical procedures were used to calculate the velocity dispersion. A new tracer mass estimator was applied to obtain a mass estimate based on the globular clusters; which is then compared to the mass obtained using X-rays. Results. In NGC 1399 the departures from a Gaussian distribution of the velocities at all radial distances are small. Our conclusion is that in spite of the observations that show that the velocity dispersion decreases between 4 and 10 Re there is evidence that dark matter exists beyond ∼3 Re. © ESO 2006;
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页码：79 / 88
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