1 / 27

The Physical Nature of Mg II Absorption Systems

This research, conducted by Daniel Nestor and collaborators David Turnshek and Sandhya Rao, delves into the complex physical nature of Mg II absorption systems. It addresses critical questions regarding these systems' implications for our understanding of galaxy evolution over cosmic time. By categorizing Mg II absorbers into distinct types—such as enriched Lyα clouds, extended disk/halo systems, and various kinds of damped Lyα systems—this study aims to elucidate the evolutionary rates tied to these systems and their contributions to the overall galactic landscape.

ulema
Télécharger la présentation

The Physical Nature of Mg II Absorption Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Physical Nature of Mg II Absorption Systems Daniel Nestor University of Florida In collaboration with: David Turnshek & Sandhya Rao University of Pittsburgh

  2. Shanghai, March 2005 Physical Nature of Mg II Systems What is the detailed physical nature of Mg II absorption systems? What does this tell us about the nature of galaxies and how that nature evolves over cosmic time?

  3. Shanghai, March 2005 Physical Nature of Mg II Systems

  4. Shanghai, March 2005 Physical Nature of Mg II Systems

  5. Shanghai, March 2005 Physical Nature of Mg II Systems

  6. Shanghai, March 2005 Physical Nature of Mg II Systems

  7. Shanghai, March 2005 Physical Nature of Mg II Systems

  8. Shanghai, March 2005 Physical Nature of Mg II Systems

  9. Shanghai, March 2005 Physical Nature of Mg II Systems

  10. Shanghai, March 2005 Physical Nature of Mg II Systems

  11. Shanghai, March 2005 Churchill et al. 2000, ApJ, 543, 577 Physical Nature of Mg II Systems

  12. Shanghai, March 2005 Churchill et al. 2000, ApJ, 543, 577 Physical Nature of Mg II Systems

  13. Shanghai, March 2005 Physical Nature of Mg II Systems

  14. Shanghai, March 2005 Physical Nature of Mg II Systems

  15. Shanghai, March 2005 Weymann et al. 1998, ApJ, 506, 1 Physical Nature of Mg II Systems

  16. Shanghai, March 2005 Physical Nature of Mg II Systems

  17. Shanghai, March 2005 Physical Nature of Mg II Systems N/z = n(z)σ(z) σ  πReff 2 Reff /Reff*= (L/L*)0.15

  18. Shanghai, March 2005 Physical Nature of Mg II Systems

  19. Shanghai, March 2005 Physical Nature of Mg II Systems

  20. Shanghai, March 2005 Physical Nature of Mg II Systems zabs = 0.529 W0λ2796 = 3.14Å

  21. Shanghai, March 2005 L  1.0 – 1.5L* b  29 kpc zabs = 0.529 Physical Nature of Mg II Systems

  22. Shanghai, March 2005 Physical Nature of Mg II Systems zabs = 0.423 W0λ2796 = 4.20Å

  23. Shanghai, March 2005 L  1.9 – 2.6L* b  20 kpc zabs = 0.423 Physical Nature of Mg II Systems

  24. Shanghai, March 2005 Physical Nature of Mg II Systems zabs = 0.670 W0λ2796 = 4.07Å

  25. Shanghai, March 2005 zabs = 0.931 L  1.1 – 1.8L* b  81 kpc zabs = 0.670 L  0.4 – 0.6L* b  72 kpc L  1.9 – 3.2 L* b  81 kpc L  0.7 – 1.0 L* b  72 kpc L  2.8 – 4.7 L* b  39 kpc L  1.0 – 1.5 L* b  35 kpc Physical Nature of Mg II Systems

  26. Shanghai, March 2005 Physical Nature of Mg II Systems

  27. Shanghai, March 2005 Summary Physical Nature of Mg II Systems Mg II absorbers represent (many) different physically distinct system types: • enriched Lyα clouds • extended disk/halo systems • DLAs (varied types) • ? superwinds • ? pair/interacting systems Evolution rate is a function of W0λ2796 Determining the relative contribution of each type as a function of W0λ2796will tell us about the evolution of those types, and vice versa.

More Related