Planet のバックアップ(No.115)

Planet Seminar 2023 †

Planet seminar is held at 15:00 every Thursday (Organizers: Yuichi Ito, Kenji Furuya)
astro-phセミナーは毎週月曜日の12:00から開催しています。（連絡係：Chanoul Seo，瀧哲朗，松本侑士）

Date	Speaker	Title	Remarks	Person in charge
4/4 15:00-15:30	Shantanu Basu (University of Western Ontario)	The Magnetic Field versus Density relation in Molecular Clouds		Fumitaka Nakamura
4/17 13:00-13:30	Lizxandra Flores Rivera (University of Copenhagen)	Gas dynamics and forbidden emission lines from outflows, jets, and disk winds in protoplanetary disks		Akimasa Kataoka
4/17 13:30-14:00	Marcelo Barraza-Alfaro (MIT)	Predicting kinematical signatures of turbulence in ALMA high-resolution observations of CO rotational lines		Akimasa Kataoka
4/18 11:00-11:30	Raffaele Rani (國立台灣師範大學)	TBD		Kazunari Iwasaki
4/19 13:00-13:30	Quantin Changeat (STScI)	TBD		Yuichi Ito
4/19 13:30-14:00	Sushuang Ma (UCL)	TBD		Yuichi Ito
4/21 13:00-13:30	Taichi Uyama (NAOJ/Caltech)	TBD		Yuka Fujii
4/21 13:30-14:00	Dipen Sahu (Physical Research Laboratory)	TBD		Kenji Furuya
4/27 15:00-16:00	Yuhiko Aoyama (北京大学)	TBD		Yuichi Ito
5/11 15:00-16:00	Sho Shibata (University of Zurich)	TBD		Yuichi Ito
6/1 15:00-16:00	Kanako Seki (The University of Tokyo)	TBD	日本語	Yuichi Ito

4/4 Shantanu Basu (University of Western Ontario), The Magnetic Field versus Density relation in Molecular Clouds: I present recent three-dimensional nonideal MHD simulations of the evolution of the magnetic field strength versus density in turbulent magnetically-dominated clouds. The results show a natural transition from a relatively flat regime into a power-law regime that is approximately described by magnetic flux freezing. We develop an analytic model that matches the main features of the simulations, and shows that there is a natural transition density from the flat to the power law regime, and that it depends on the ambient Alfven Mach number. I also review some recent DCF observations of magnetic fields in dense star-forming regions and show that an apparent B-rho exponent of 2/3 can be understood in the context of strong magnetic fields, unlike some common interpretations of that exponent.