Magnetic Fields in Diffuse Media

Scientific Rationale

2008-09-07T10:29:00.000-07:00

Most of the baryonic matter in the Universe is permeated by magnetic fields, which affect many, if not most of astrophysical phenomena in diffuse gas. Recent years have been marked by a worldwide growing interest in the magnetic fields, their origin, and their influence on the
formation and evolution of astrophysical objects (stars, galaxies, cooling flows). This interest is growing as it has become feasible to trace magnetic fields in molecular clouds, over vast extensions of the Milky Way and to study extragalactic magnetic fields, including fields in clusters of galaxies. With the combination of various techniques, including Zeeman and Faraday rotation measurements with polarimetry it is now possible to undertake quantitative studies of magnetic fields, the results of which can be compared with the results of dynamo and MHD turbulence simulations, subjects that have also made huge strides within several recent years.
The time is ripe to address many vital questions related to the origin of astrophysical magnetic fields in diffuse gas and quantify their effects on transport processes in the interstellar medium of spiral galaxies and in the intracluster medium, in order to get better insight into star formation, acceleration of cosmic rays, and transfer of matter and energy between the diffuse and dense gas. Thus it is really important to bring together world experts to identify the present state of art of the subject, summarize the progress achieved recently, as well as to outline the remaining outstanding problems, and review the progress of the 21st century instruments and projects for cosmic magnetic field investigation such as, upgraded SOFIA, PLANCK, LOFAR, ALMA and SKA.
This Joint Discussion at the IAU General Assembly will provide an excellent forum for this timely undertaking. Because of the cross-disciplinary nature of the subject and the intended discussion sessions, we expect to catch the attention and interest of a wide range of astrophysicists, including specialists in space and Solar physics. In fact, we plan to have also talks that would discuss magnetic fluctuations measured by spacecrafts.

Scientific Organizing Committee - SOC

2008-09-07T09:50:00.000-07:00

E. de Gouveia Dal Pino (Brazil) (chair)
A. Lazarian (USA) (chair)
M. Begelman (USA)
M. Dopitta (Australia)
T. Ensslin (Germany)
E. Falgarone (France)
P. Franco (Mexico)
S. Inutsuka (Japan)
G. Lugones (Brazil)
C. Mckee (USA)
G. Setti (Italy)

Scientific Program

2008-09-07T09:26:00.000-07:00

Program Schedule

I: Invited Speaker
O: oral contribution

Wednesday 12 August 11:00 - 17:30

11:00 Opening E. M. de Gouveia Dal Pino & A. Lazarian

11:05 - 12:30 session 1 "Observing Magnetic Fields"
11:05 K. Shibata (Japan) ”Coronal heating and solar wind acceleration and new data of Hinode Satellite” (I)
11:25 C. Heiles (USA) "Direct Measurements of Magnetic Fields in the Interstellar Medium – the Milky Way and Beyond" (I)
11:45 A.M. Magalhaes (Brazil) “Starlight Polarization: A Tool for Studying the Magnetic Field” (I)
12:05 R. Beck (Germany) “Cosmic Magnetic Field Observations with next generation instrumentation” (I)
12:25 Panel Discussion

12:30 - 14:00 lunch

14:00 - 15:30 session 2 "Dynamo and Magnetic Reconnection Processes"
14:00 A. Brandenburg, F. Del Sordo (Sweden) "Magnetic Dynamo over Different Astrophysical Scales " (I)
14:20 A. Lazarian (USA) "Fast Reconnection of Weakly Stochastic Magnetic Field: Theoretical Model and its Testing" (I)
14:40 E. Vishniac, D. Shapovalov (Canada) “Dynamo Theory” (I)
15:00 D. O. Gomez , Pablo D. Mininni , Pablo Dmitruk (Argentina) “Numerical simulations of Hall-MHD small-scale dynamos” (O)
15:15 Panel/Poster Discussion

15:30 - 16:00 break and poster session

16:00 - 17:30 session 3 "MFs in the ISM and the SF connection"
16:00 R. Crutcher (USA) "Role of magnetic fields in molecular clouds" (I)
16:20 F. Shu, S. Lizano (USA/Mexico) "The evolution of a magnetized cloud: from gravitational collapse to protoplanetary disks" (I)
16:40 E. Falgarone, P. Hily-Blant (France) "Observational Constraints on Magnetic Fields in Molecular Clouds" (I)
17:00 Panel/poster discussion

Thursday 13 August 09:00 - 12:30

09:00 - 10:30 session 4 "MFs in the ISM and the Galaxy"
09:00 E. Vazquez-Semadeni (Mexico) "Numerical models of the magnetized ISM" (I)
09:20 S. Inutsuka (Japan) "Phase Transition Dynamics of Magnetized Interstellar Medium" (I)
09:40 H. Yan (USA/China) “Magnetic Field Diagnostics with Aligned atoms” (I)
10:00 M. Haverkon (Holland) “Magnetic fields in the Galactic halo using radio spectro-polarimetry” (I)
10:20 Panel discussion

10:30 - 11:00 break and poster session

11:00 - 12:30 session 5 "MFs in Galaxies and Surroundings"
11:00 J.-L. Han (China) “Galactic magnetic fields: Large-scale structure” (O)
11:15 E.M. de Gouveia Dal Pino (Brazil) "Magnetic Fields in Galactic Halos and the SN connection" (I)
11:35 K. T. Chyzy (Poland) “Magnetic fields in dwarfs versus early-type galaxies” (O)
11:50 D. S. de Young (USA) “The Role of Turbulence in Radio AGN Feedback” (O)
12:05 Panel/poster discussion

12:30 - 14:00 lunch

Friday 14 August 09:00 - 12:30

09:00 - 10:30 session 6 "Magnetic Fields in the ICM and beyond"
09:00 T. Ensslin (Germany) "Magnetic Turbulence in Clusters of Galaxies" (I)
09:20 L. Feretti (Italy) "Cosmic Rays in Magnetized Intracluster Plasma" (I)
09:40 K. Subramanian (India) “Magnetic Fields in Primordial Plasmas” (I)
10:00 K. Dolag (Germany) “Magnetic fields in and beyond clusters of galaxies" (O)
10:15 Panel/poster discussion

10:30 - 11:00 break and poster session

11:00 - 12:30 session 7 “MHD turbulence in all scales”
11:00 D. Falceta-Goncalves (Brazil) "Properties of MHD Turbulence and its Consequences for Interstellar and Intracluster Media" (I)
11:20 J. Cho (Korea) “Growth of magnetic fields by turbulent motions” (O)
11:35 G. Brunetti (Italy) "Models of Particle Re-acceleration by Magnetic Turbulence in Galaxy Clusters" (I)
11:55 M. A. de Avillez (Portugal) “High-Resolution Modeling of the Interstellar Medium using Time-dependent Ionization Structure” (I)

12:15 Panel Discussion: Summary and Concluding Remarks A. Lazarian & E. de Gouveia Dal Pino

12:30 Closure

Invited Speakers

2008-09-07T08:55:00.000-07:00

A. Brandenburg "Magnetic Dynamo over Different Astrophysical Scales" (Sweden)

R. Beck “Cosmic Magnetic Field Observations with next generation instrumentation” (Germany)

G. Brunetti "Models of Electron Re-acceleration by Magnetic Turbulence in
Galaxy Clusters" (Italy)

R. Crutcher " Role of magnetic fields in molecular clouds" (USA)

M. de Avillez “High-Resolution Modelling of the Interstellar Medium using Time-dependent Ionization Structure” (Portugal)

E. de Gouveia Dal Pino "Magnetic Fields in Galactic Halos and the SN connection" (Brazil)

M. Dopita "Magnetic Fields in Different Types of Galaxies" (Australia)

T. Ensslin "Magnetic Turbulence in Clusters of Galaxies" (Germany)

D. Falceta-Goncalves "Properties of MHD Turbulence and its Consequences for ISM and Intracluster Media" (Brazil)

E. Falgarone "Observational Constraints on Magnetic Fields in Molecular Clouds" (France)

L. Feretti "Cosmic Rays in Magnetized Intracluster Plasma" (Italy)

M. Haverkorn "Magnetic Turbulence from Faraday Rotation Measurements" (Holland)

C. Heiles "Magnetic Fields in HI from Zeeman measurements" (USA)

S. Inutsuka "Instabilities in Magnetized ISM" (Japan)

A. Lazarian “"Turbulent Reconnection of Magnetic Fields and Implications" (USA)

S. Lizano "Magnetic Field effects on the Evolution of Molecular Clouds and Star formation" (Mexico)

A. M. Magalhaes “Brazilian-French Polarimetric Survey” (Brazil)

C. McKee "Role of Magnetic Fields for Star Formation" (USA)

K. Shibata ”The solar wind interaction with space environment and the new data from the Hinode Satellite” (TBC)

K. Subramanian “Magnetic Fields in Primordial Plasmas” (India)

E. Vazquez-Semadeni "Modeling of Magnetized Interstellar Medium " (Mexico)

E. Vishniac "Dynamo Theory" (Canada)

H. Yan “Magnetic Field Diagnostics with Aligned atoms (China)

E. Zweibel (USA) “Origin of Cosmic Fields" (USA) (TBC)

Registration

2008-09-07T08:35:00.000-07:00

Go to the Pre-Registration site of the XXVII General Assembly of the IAU

Importante Dates

2008-09-05T16:33:00.000-07:00

The ABSTRACT submission will be opened until MARCH 15, 2009.

The EARLY REGISTRATION will be opened until MAY 1, 2009.

Contact Addresses

2008-09-01T19:05:00.000-07:00

Contact and information about the IAU Joint Discussion 15 "Magnetic Fields in Diffuse Media" may be obtained at iaujd.mf@gmail.com

Contact and information about the General Assembly may be obtained at astronomy2009@jz.com.br.