Interstellar filament paradigm:

On their formation, evolution, and role in star formation

November 5-9, 2018 : Nagoya University : Japan
Confirmed Invited Speakers:

Marta Alves (Radboud University, Nijmegen) 

Philippe André (CEA Saclay)

Che-Yu Chen (University of Virginia) 

Susan Clark (Institute for Advanced Study, Princeton)

Christoph Federrath (The Australian National University) 

Alvaro Hacar (Leiden University)

Tomoyuki Hanawa (Chiba University) 

Kazunari Iwasaki (Osaka University)

Yueh-Ning Lee (CEA Saclay)

Gina Panopoulou (California Institute of Technology)

Nicolas Peretto (Cardiff University) 

Scientific Rationale of the conference:

Understanding how stars form in the cold interstellar medium of galaxies is a fundamental issue in modern astrophysics. Large scale Herschel and Planck observations of submillimeter dust emission revealed the omnipresence of filamentary structures in the interstellar medium (ISM). The ubiquity of filaments in quiescent clouds as well as in star-forming regions indicates that the formation of filamentary structures takes place before any star formation activity and that it is a natural product of the physics at play in the magnetized turbulent ISM. Moreover, the spatial distribution of star forming cores observed mainly along the densest filaments suggests that the properties of interstellar filaments are a key element defining the initial conditions required for the onset of star formation. Hence, describing filament properties by detailed observations tracing gas and dust in total and polarized intensities, and understanding the results of realistic numerical simulations as well as analytical calculations, are essential to make progress in our understanding of the physical processes involved in the formation and evolution of interstellar filaments and their role in the star formation process. 

Objectives of the conference:

- Filamentary structures result from the interplay between interstellar shock waves, gravity and magnetic field. What is the role of these various processes in the formation and evolution of interstellar filaments? What is the link between the filamentary structures observed in the atomic medium and those of the molecular clouds? How do dense, gravitationally unstable filaments fragment into star forming core? What is the role of filaments in a general context of star formation in various conditions? 

- The aim of the conference is to provide an inspiring venue to stimulate discussions between active researchers, with both theoretical and observational expertise, exchanging new findings and ideas related to interstellar filament formation, evolution, and their role in the star formation process. 

Key topics to be addressed during the conference:

- Observed properties of interstellar filaments (observations from dust, molecular and atomic gas, in neutral and ionized medium, in total and polarized emission), in nearby clouds, IRDC, CMZ, LMC. 

     - Density and column density structures of filamentary clouds

     - Magnetic field structure of clouds and filaments

     - Filament kinematics and dynamical interaction with surrounding ISM

     - Distribution of cores and protostars on/off filaments 

- Filaments in numerical simulations: Quantitative comparison between observations and numerical simulations.

- Theoretical understanding of filament formation, evolution, fragmentation (Interplay between shock waves, magnetic field, gravity)

- Scales in the ISM: are there particular scales in the ISM? (Turbulence injection scale, dissipation scale, what about Larson’s relations? Are filaments and cores part of Larson’s relations?)

- Role of filaments in regulating the star formation efficiency in molecular clouds 

Scientific Organizing Committee:

Doris Arzoumanian (Nagoya University, co-chair)

Katia Ferrière (IRAP, Toulouse)

Patrick Hennebelle (CEA Saclay)

Tsuyoshi Inoue (Nagoya University)

Shu-ichiro Inutsuka (Nagoya University, co-chair)

Kohji Tomisaka (NAOJ)

Local Organizing Committee:

Doris Arzoumanian (Chair), Yuri Fujii,

Tsuyoshi Inoue, Shu-ichiro Inutsuka, 

Hiroshi Kobayashi, Kengo Tachihara

(Nagoya University)

Sponsored by Nagoya University grants for international conferences and NAOJ grants for international conferences

Co-sponsored by Graduate School of Science, Nagoya University

Cygnus X: ESA/Herschel PACS & SPIRE, HOBYS Key program