PowerPoint Presentation - ?????? 1

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Quasar Outflows The X-ray perspective
Doron Chelouche Institute for Advanced Study,
Princeton NJ (currently at Tel-Aviv University,
Israel)

• Introduction
• Model
• NGC 3783
• Conclusions

Outline
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• Phenomenology
• blueshifted absorption lines
• common in type-I quasars
• velocity range 102-105 km s-1

• Relevant to
• Accretion-ejection processes
• Quasar structure (unification)
• Galaxy and cluster formation

Introduction
Determining the flow properties is essential for
investigating these issues
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Aim to determine the flow properties
Mean by comparing model predictions to
observations
predictions method Spectral features (line, continuum) Flow properties (v, )
photoionization ? ?
dynamics ? ?
Model
Flow properties are poorly constrained
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Solution Combine detailed photoionization
and dynamical calculations
Model
Next step Comparing to observations
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• gt100 absorption lines
• Continuum absorption
• Continuum variability

Kaspi et al. 2002
Pure photoionization models
NGC 3783
What is the physics characterizing the multiphase
flow?
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The dynamical viewpoint
NGC 3783
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• Summary of X-ray results for NGC3783
• The flow is energy driven (radiative
  acceleration is negligible)
• The flow is launched beyond the accretion disk
  (torus
  association?)
• The mass loss rate is similar to/smaller than the
  mass accretion rate (much smaller
  than previous estimates)
• The flow density structure is reminiscent of a
  turbulent ISM
  (triggered by the central star cluster?)

NGC 3783
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• Studying quasar outflows is important for
  understanding accretion phenomena, quasar
  structure, and galaxy/cluster formation
• High resolution and S/N X-ray grating spectra
  provide a unique view of such flows
• Realistic spectral fits accounting for hundreds
  of line and continuum features are feasible
• Combined dynamical, photoionization, and spectral
  modeling can reveal the physical properties of
  the ouflowing gas
• Similar models can be used to study gas dynamics
  in other systems (e.g., X-ray binaries)

Thank you!
conclusions
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Fitting method
Initial guess
NGC 3783
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• gt100 absorption lines
• Continuum absorption
• Continuum variability

Multiphase outflow
NGC 3783