asymmetric absorption profiles around ly alpha lyman beta
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Asymmetric Absorption Profiles around Ly alpha Lyman beta. 2013. Feb 15 Sejong University Hee -Won Lee. Content. Quasar Absorption Systems Kramers -Heisenberg Formula Asymmetry in Scattering Cross Section Observational Ramifications Summary. Quasar Absorption Systems. - PowerPoint PPT PresentationTRANSCRIPT
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Asymmetric Absorption Profiles around Ly alpha Lyman beta
2013. Feb 15Sejong University
Hee-Won Lee
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Content Quasar Absorption Systems Kramers-Heisenberg Formula Asymmetry in Scattering Cross Section Observational Ramifications Summary
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Quasar Absorption Systems
Lyman Alpha Forest Lyman Limit System Damped Lyman Alpha System
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Lyman alpha forest
Residual neutral hydrogen component forming a filamentary structure in the intergalactic medium
Appears in the absorption profile blueward of Lyman alpha of a background quasar
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Damped Lyman Alpha Systems
Defined by N_HI>2X10^20 cm^-2
Maybe disk component of a galaxy intervening the sightline
Contain most neutral hydrogen providing raw material for star formation during the most of the cosmic time from the reion-ization era.
Important probe for cosmic chemical evolution
May contain some dust.
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Chemical Evolution with DLAs
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Voigt Profile Convolution of a Gaussian and a
Lorentzian The core part is approximately
Gaussian whereas the wing part is Lorentzian.
Resonance line shape is approx-imately Lorentzian in the near wing part.
Far wing part, deviation from a Lorentzian is observed depend-ing on the atomic wavefunction.
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Resonance Scattering in Classical Physics
An atom is regarded as a simple harmonic oscilla-tor.
Scattering of electromag-netic radiation by an atom is analogous to an exter-nally driven simple har-monic oscillator.
Lorentzian behavior is universally obtained.
Quantum mechanical cor-rection is given in terms of the oscillator strength.
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Qunatum Mechanical Description
Initial State: Incident Photon+Atom in Ground State Intermediate State : Atom in an excited np state. Final State: Outgoing Photon+Atom in Ground (or
Excited) State
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Kramers-Heisenberg Formula
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Hydrogen Atom
Admits wavefunctions in an analytically closed form.
Electric dipole operator connecting two eigenstates of hydrogen has matrix ele-ments given in terms of confluent hyperge-ometric function.
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Expansion of K-H Formula around Ly Alpha
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Expansion of K-H Formula around Ly beta
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Exact Cross Section around Ly alpha and beta
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Asymmetry around Ly alpha and Ly beta
Redward asym-metry around Lyman alpha.
Blueward asymmetry around Ly beta
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Transmission Coefficients
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Absorption Center shift
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Voigt fit using shifted centers (ly a)
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Shifted Voigt function (ly b)
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Extreme HI content toward grb GRB 080607 N HI=5X10 22 cm-2 Inadequecy of Voigt profile fitting Accurate atomic physics is neces-
sary.
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Why?
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Summary and Discussion
Accurate atomic physics is required for care-ful analysis of DLAs, which are important in study of star formation process.
GRBs may provide another aspect of star forming history.
Gunn-Peterson troughs should be analyzed using accurate atomic physics.