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http://hdl.handle.net/1974/6305
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| Title: | Globular Cluster Kinematics and Dark Matter Content of the Isolated Elliptical NGC 720 |
| Authors: | SCHEMBRI, AMANDA M |
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| Keywords: | globular cluster system
kinematics and dynamics
NGC 720 |
| Issue Date: | 2011 |
| Series/Report no.: | Canadian theses |
| Abstract: | We examine the globular cluster system (GCS) of the isolated elliptical NGC 720 using the Gemini Multi-Object Spectrograph (GMOS) and have obtained spectra for 241 candidate globular clusters (GCs) extending to a galactocentric radius of 40 kpc. Of the 241 candidates, 120 are confirmed GCs, where 46 are members of the metal-poor, blue, population and 74 are members of the metal-rich, red, population. A (g-i)=0.50 colour split is used to identify the blue and red populations. We measure the full GCS to have a rotational velocity (Vrot) of 50 +/- 7 km/s with a position angle (PA) of 170 +/- 69 degrees. The red population has a Vrot = 97 +/- 14 km/s with PA = 147 +\- 18 degrees and the blue population has a Vrot = 79 +/- 7 km/s with PA = 89 +/- 18 degrees. The full GCS has an average velocity dispersion of 168 +/- 22 km/s, for
the red population is 156 +/- 30 km/s and for the blue population is 181 +/- 33 km/s.
The velocity dispersion pro file for all populations is constant with increasing radius, suggesting the presence of a dark matter halo. Using a tracer mass estimator, we have measured the mass out to 40 kpc as 1.8(+0.6/-0.1)x10^12 Msun for a potential which traces the dark matter pro file. We also estimate the M/L_V = 30 - 70. This study
extends our survey of GCSs to isolated environments. |
| Description: | Thesis (Master, Physics, Engineering Physics and Astronomy) -- Queen's University, 2011-01-31 11:30:54.389 |
| URI: | http://hdl.handle.net/1974/6305 |
| Appears in Collections: | Queen's Theses & Dissertations
Physics, Engineering Physics & Astronomy Graduate Theses
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