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Probing Dense Gas Dynamics with Core Velocity Dispersion (CVD)

Probing Dense Gas Dynamics with Core Velocity Dispersion (CVD). NAOC Zhichen Pan 2012-09-26. Probing Dense Gas Dynamics with Core Velocity Dispersion (CVD). 1, From Larson’s Law to CVD; 2, Observation and CVD of Taurus Cloud; 3, Simulations;. Larson’s Law. A molecular cloud.

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Probing Dense Gas Dynamics with Core Velocity Dispersion (CVD)

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  1. Probing Dense Gas DynamicswithCore Velocity Dispersion (CVD) NAOC Zhichen Pan 2012-09-26

  2. Probing Dense Gas DynamicswithCore Velocity Dispersion (CVD) 1, From Larson’s Law to CVD; 2, Observation and CVD of Taurus Cloud; 3, Simulations;

  3. Larson’s Law A molecular cloud Linewidthσ Linear size L Power law

  4. Larson’s Law R. B. Larson, 1981

  5. Larson’s Law Rahul Shetty, et al. 2012

  6. From Larson’s Law to CVD • Larson’s Law: • Turbulence • Linear size---linewidth • Power law with different index • Dense gas motion: • Cores • Cores’ velocity difference, standard deviation • Cores’ projection distance •  CVD: Core Velocity Dispersion

  7. Taurus Cloud and Cores Lei Qian, Di Li, Paul F. Goldsmith, 2012

  8. Taurus Cloud and Cores Lei Qian, Di Li, Paul F. Goldsmith, 2012

  9. CVD (+28km/s)-(+16km/s)=(+12km/s) 12km/s : 33pc +16km/s +28km/s 33 pc

  10. CVD of Taurus Cloud Lei Qian, Di Li, Paul F. Goldsmith, 2012

  11. Simulation Creating cores with velocity in data cubes with different depth Sampling cores in given depth Calculating projection distance And velocity difference of each two cores Fitting CVD(the power law equation)

  12. Simulation A 256x256x256 data cube Sampling about 2000 cores in different depths: 1, 2, 4, 32, 64, 256 Simulated power law indexes: 0.454, 0.438, 0.430, 0.247, 0.120, 0.021

  13. Conclusion 1, From Larson’s Law to CVD: Inspired by Larson’s Law, we introduce the CVD. It describes the core velocity dispersion quantitatively; 2, We mapped the Taurus Cloud’s 13CO map and obtained its CVD; 3, From our simulation, the depth in the direction of line-of-sight affects the CVD a lot; 4, Cores drift with the turbulence: The close similarity between CVD and Larson’s law suggests that molecular cores condense out of the diffuse gas without additional energy from star formation or significant impact from converging flows.

  14. Thank you! Thanks: Di Li, Lei Qian. NAOC Zhichen Pan 2012-09-26

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