Joint Ly alpha Emitters * Quasar Reionization Constraints

2013. Feb 15
Sejong University
Hee-Won Lee
Quasar Absorption Systems
Kramers-Heisenberg Formula
Asymmetry in Scattering Cross Section
Observational Ramifications
Lyman Alpha Forest
 Lyman Limit System
 Damped Lyman Alpha System
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
Defined by N_HI>2X10^20
Maybe disk component of a
galaxy intervening the
Contain most neutral
hydrogen providing raw
material for star formation
during the most of the
cosmic time from the
reionization era.
Important probe for cosmic
chemical evolution
May contain some dust.
Convolution of a Gaussian and
a Lorentzian
The core part is approximately
Gaussian whereas the wing
part is Lorentzian.
Resonance line shape is
approximately Lorentzian in
the near wing part.
Far wing part, deviation from a
Lorentzian is observed
depending on the atomic
An atom is regarded as a
simple harmonic
Scattering of
radiation by an atom is
analogous to an
externally driven simple
harmonic oscillator.
Lorentzian behavior is
universally obtained.
Quantum mechanical
correction is given in
terms of the oscillator
Initial State: Incident Photon+Atom in Ground
 Intermediate State : Atom in an excited np state.
 Final State: Outgoing Photon+Atom in Ground
(or Excited) State
Admits wavefunctions in an analytically
closed form.
 Electric dipole operator connecting two
eigenstates of hydrogen has matrix
elements given in terms of confluent
hypergeometric function.
around Lyman
 Blueward
around Ly beta
GRB 080607
N HI=5X10 22 cm-2
Inadequecy of Voigt profile
Accurate atomic physics is
Accurate atomic physics is required for
careful 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.

similar documents