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Mass-Temperature relation in galaxy clusters

DFS 2007. Mass-Temperature relation in galaxy clusters. Desiree Della Monica Ferreira Dark Cosmology Centre – Niels Bohr Institute University of Copenhagen desiree@astro.ku.dk. Clusters of Galaxies. Largest gravitationally bond objects in the universe Missing mass problem

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Mass-Temperature relation in galaxy clusters

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  1. DFS 2007 Mass-Temperature relation in galaxy clusters Desiree Della Monica Ferreira Dark Cosmology Centre – Niels Bohr Institute University of Copenhagen desiree@astro.ku.dk

  2. Clusters of Galaxies • Largest gravitationally bond objects in the universe • Missing mass problem • X-rays: Hot intra cluster medium • Dark matter

  3. Coma Cluster - Optical and X-ray - Source: Chandra X-ray Observatory

  4. Bachelor Projectsupervised by Kristian Pedersen • X-ray view of cluster of galaxies. • X-ray properties of Abell 3364 • Standard XMM data analysis. • SAS, Xspec, beta model... • Cluster mass and gas mass.

  5. Master Projectsupervised by Kristian Pedersen • XMM-Newton view of simulated galaxy clusters. • X-ray properties. • comparing simulation to derived results. • Mass - Temperature relation.

  6. Simulated Clusters • Gadget-2 (Springel 2005) • SPH code simulates structure formation • 4 galaxy clusters (Borgani et. al) • 1.3x1015 M⊙ • 3x1014 M⊙ • 2.4x1014 M⊙ • 1.6x1014 M⊙

  7. Scisim • simulator for the XMM-Newton observatory • to generate realistic simulated science data for a wide range of observational scenarios e.g. ICM http://xmm.vilspa.esa.es/scisim/

  8. Simulation  Scicim • Read data from simulation output. • Rotate the simulation box. • Create spectrum for each gas particle. • Read spectra. • Creates X-ray image. • Produces Scisim input file.

  9. Scisim Output • Events file: • Same analysis as real observations.

  10. Cluster’s Mass • Spherical symmetry. • Low density ideal gas. • Hydrostatic equilibrium. Cluster’s total mass:

  11. Brightness Profile: Gas Density Profile: Gas Mass:

  12. Temperature • Xspec • Wabs: photo-electric absorption model • Mekal: Model for an emission spectrum from hot diffuse gas. Line emissions from several elements. • single temperature model

  13. X-ray Brightness Profile

  14. Some Results

  15. Some Results

  16. Some Results

  17. Some Results

  18. Some Results

  19. Some Results

  20. Summary • Galaxy clusters as cosmological probes • X-ray observations • Determination of the galaxy cluster’s mass • N-body simulation + virtual observation • Mass-temperature relation To be finished in two days.

  21. Thank you

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