تقرير
Velocity dispersion measurements of dwarf galaxies in the Coma cluster - implications for the structure of the fundamental plane
| العنوان: | Velocity dispersion measurements of dwarf galaxies in the Coma cluster - implications for the structure of the fundamental plane |
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| المؤلفون: | Cody, A. M., Carter, D., Bridges, T. J., Mobasher, B., Poggianti, B. M. |
| سنة النشر: | 2009 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | We present intermediate-resolution spectroscopic data for a set of dwarf and giant galaxies in the Coma Cluster, with -20.6 < M_R < -15.7. The photometric and kinematic properties of the brighter galaxies can be cast in terms of parameters which present little scatter with respect to a set of scaling relations known as the Fundamental Plane. To determine the form of these fundamental scaling relations at lower luminosities, we have measured velocity dispersions for a sample comprising 69 galaxies on the border of the dwarf and giant regime. Combining these data with our photometric survey, we find a tight correlation of luminosity and velocity dispersion, L \propto \sigma^{2.0}, substantially flatter than the Faber-Jackson relation characterising giant elliptical galaxies. In addition, the variation of mass-to-light ratio with velocity dispersion is quite weak in our dwarf sample: M/L \propto \sigma^{0.2}. Our overall results are consistent with theoretical models invoking large-scale mass removal and subsequent structural readjustment, e.g., as a result of galactic winds. Comment: 15 pages, 11 figures, 1 table. MNRAS, in press |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2009.14826.x |
| URL الوصول: | http://arxiv.org/abs/0905.0508 |
| رقم الأكسشن: | edsarx.0905.0508 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1111/j.1365-2966.2009.14826.x |
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