Loading...

Scaling Relations in Dwarf Galaxies of the Coma Cluster of Galaxies

Kourkchi, Ehsan | 2012

2375 Viewed
  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 41757 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Mansouri, Reza; Khosroshahi, Habib
  7. Abstract:
  8. We study the fundamental and the photometric plane of a sample of 50 dwarf galaxies within the core of Coma cluster observed with DEIMOS on Keck II down to R-band luminosity of -15 Magnitudes. The Calcium triplet lines in the wavelength range between 7500 to 10,000 ˚A, allow us to obtain the velocity dispersion for the sample galaxies with high precision. We also performed a comprehensive error analysis to better estimate the uncertainties of this key observable. We also carried out a galaxy structure modeling using the ACS I-band images for a larger sample. We found larger velocity dispersions for fainter dwarfs than what expected from mass-luminosity trends of brighter Coma galaxies. In addition, fainter galaxies do not lie on the fundamental plane of brighter dwarf galaxies and their deviations from the fundamental plane increases as their luminosities, central velocity dispersions and Sersic indices decrease. We also noticed that those faint galaxies, which are outliers in the fundamental plane relation, have excess light at their central region with respect to their corresponding S´ersic model. The photometric plane for the sample galaxies shows reduced scatter around the plane at the faint-end, in comparison to the same in the fundamental plane.
  9. Keywords:
  10. Dwarf Galaxies ; Coma Treasury Survey ; Galaxies Fundamental Plane ; Galaxies Scaling Relations ; Galaxies Photometry ; Galaxies Velocity Dispersion

 Digital Object List

 Bookmark

...see more