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Application of Radiation Transfer Model to
Simulated Molecular Clouds Chuang,Hui-Wen
Supervisor: Allen,AnthonyHelper:Minho ChoiDate:Aug27, 2002
Outline:
FortranModel of cloud core by Li and ShuDiscuss column densityMy simulationHow to compare with observorsConclusion
Magnetized singular isothermal toroidsZHI-YUN LI AND FRANK H.SHU 1996
column density= dl
H0=0Theta=0o
H0=0
Theta=30o
H0=0
Theta=60o
H0=0
Theta=90o
What’s n / Ho ?
N=4Ho
Ho is a nondimensional parameter ,which characterizes the proportion of support provided against self-gravity by poloidal magnetic fields relative to that of gas pressure.
H0=0.25
Theta=0o
H0=0.25
Theta=30o
H0=0.25
Theta=60o
H0=0.25
Theta=90o
H0=0.5
Theta=0o
H0=0.5
Theta=30o
H0=0.5
Theta=60o
H0=0.5
Theta=90o
H0=1
Theta=0o
H0=1
Theta=30o
H0=1
Theta=60o
H0=1
Theta=90o
H0=1.5
Theta=0o
H0=1.5
Theta=30o
H0=1.5
Theta=60o
H0=1.5
Theta=90o
n Ho Column density at center
0 0 5.017854667*1023 (cm-2)
1 0.25 4.916614410*1023 (cm-2)
2 0.5 5.389714749*1023 (cm-2)
4 1.0 6.738817213*1023 (cm-2)
6 1.5 8.240783125*1023 (cm-2)
The column density of the cloud core’s center
Ho=0 a/b=1.00007449
Ho=0.25 a/b=1.50855809
Ho=0.5
a/b=1.85135098
Ho=1
a/b=2.27861084
Ho=1.5
a/b=2.53273911
Ho a/b
0 1.00007449
0.25 1.50855809
0.5 1.85135098
1.0 2.27861084
1.5 2.53273911
Average:
=10o,20o,30o,40o,50o,60o,70o,80o,90o
WRONG
A=r2 ddsin
=2 r2 dsin
=cos-1q
q is between 0 and 1.0
cos
1
2
Conclusion:
What I did *familiar with fortran *how to calculate the ratio of a/b (using q)
Future work *how to compare with observations
Appreciation:
TonyMinhoJeremyNaOMiTakakuwaPin GaoSummer students ^____^All my friend here