Atomic Processes in Gaseous Nebulae
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Atomic Processes in Gaseous Nebulae Andri Prozesky MSc
description
Andri Prozesky MSc. Atomic Processes in Gaseous Nebulae. Outline. Introduction Atomic Processes Modelling Nebulae Why is this New? Why is this Important? Results Future Work. Introduction. Introduction. Atomic Processes - Radiative. Bound-bound processes. Absorption - PowerPoint PPT Presentation
Transcript of Atomic Processes in Gaseous Nebulae
Atomic Processes in Gaseous NebulaeAndri ProzeskyMSc
Outline
Introduction Atomic ProcessesModelling NebulaeWhy is this New?Why is this Important?ResultsFuture Work
Introduction
Introduction
Atomic Processes - Radiative
Absorption Spontaneous emission Stimulated emission
Bound-bound processes
Photoionization Radiative recombination Stimulated recombination
Bound-free processes
Atomic Processes - Collisional
Collisional excitation Collisional de-excitation
Bound-bound
Collisional ionization Three-body
recombination
Bound-free
Modelling Nebulae
Probabilities of processes
Occupation numbers
Line fluxes
Modelling Nebulae
Thermodynamic equilibrium
Boltzmann distribution:
Modelling Nebulae
Real world Express occupation numbers ito departure
coefficients (bn values)
Nn in TEActual Nn
bn =
Modelling Nebulae
104 K104 cm-3
Te =Ne =
Modelling Nebulae
Specific focus – radio recombination lines (RRLs)
Why is this new?
Full quantum mechanical treatmentNewer atomic dataBetter computing power
Why is this new?
Calculations to higher nStimulated processes includedApplicable to very wide temp range
Why is this important?
New era in radio astronomy with higher sensitivity
Theory behind observations
Why is this important?
Check previous results
Bauman, Porter, Ferland & MacAdam (2005) ApJ 628 541
Results
Case A
Case B
Results
104 K104 cm-3
Te =Ne =
Results
104 K104 cm-3
20 pc
Te =Ne =
Rneb =
Future work
Include He and metalsRadiation fieldStructure of plasma
Future work
Effects of dustRadiative transfer
Thank you
