Polarimetry in the ALMA era: a new crossroads of astrophysics

    2019 March 26 (Tuesday) – March 29 (Friday)

    National Astronomical Observatory of Japan (Mitaka, Tokyo, Japan)


Abstract submission was closed on February 7th.


Magnetic fields (B fields) are believed to play key roles in any astronomical objects, yielding common viewpoints when we analyses data obtained from observations and simulations.  To understand roles of B fields, one must know both B-field structures and their strengths.

ALMA has offered opportunities to study the former towards compact sources, e.g., disks and jets around forming stars, by linear-polarization imaging. Despite limited capabilities as non-standard observations, polarization observations with ALMA are very suggestive. One of the important lessons is that one cannot naively transfer knowledge obtained from the polarimetry towards the low-density regions (e.g., molecular clouds) to the innermost high-density regions that ALMA can explore.

At the same time, it becomes clear that scientific outcome will be more fruitful if ALMA would enhance its wide-field polarization imaging capabilities and offer circular polarization detection capabilities. We also recognize importance to link single-dish polarimetric studies, e.g., using POL-2 at JCMT, with those by ALMA to shed light on the roles of B fields. This is simply because any interplay between self-gravity of gas and other forces by e.g., turbulence and B fields are multi spatial scale phenomena.

Organization of the meeting

Given the above, we consider that B fields are crossroads of astrophysics,

and organize sessions of this meeting as,

-       Circumstellar B fields,

-       Interstellar B fields,

-       Circumnuclear B fields,

-       Intergalactic B fields.

In addition, we will have a session to discuss relations between

-       Dust and B fields.

Notice that the “circumnuclear B fields” session is intended to discuss B fields in galaxies.

Invited speakers

We organize this meeting as a domestic one in Japan. However, in order to promote future collaborations, we invite the following scientists mostly from East Asian countries. All the talks will be given in English.

Below are KEYWORDS (not talk titles) of the topics that organizers asked

for invited speakers to address.

Huabai LI (CUHK, Hong Kong)

Roles of B fields in formation and evolution of molecular clouds

Kazunari IWASAKI (Osaka U., Japan)

Roles of B fields in formation and evolution of molecular clouds and cloud cores

Tao-Chung CHING (National Astronomical Observatories, Chinese Academy of Sciences, China)

1 – 0.1 pc scale B field in massive star-forming region(s) with the Planck and JCMT POL-2

Kate PATTLE (NTHU, Taiwan)

0.1 –0.01 pc scale B field of star-forming regions with JCMT POL-2

Jia-Wei WANG (NTHU, Taiwan)

1 – 0.01 pc scale B field of hub-filament structure in star-forming region(s) with NIR and submm polarimetry

Ryo KANDORI (ABC, Japan)

B fields and dust properties towards starless cloud core(s) with NIR polarimetry

Yusuke TSUKAMOTO (Kagoshima U., Japan)

Importance of non-ideal MHD phenomena in protostar formation

Shingo HIRANO (Kyusyu U., Japan)
Visualizations of magnetic field structures of protostellar envelopes

Keping QIU (Nanjing U., China)

Polarization observations towards protostellar envelopes and jets with SMA and ALMA, detection of Goldreich-Kylafis effect

Satoko TAKAHASHI (JAO & NAOJ, Chile)

Linear polarization observations towards circumstellar dusts with ALMA

Hiroko SHINNAGA (Kagoshima U., Japan)

Interferometric polarization observations towards late-type stars

Akimasa KATAOKA (NAOJ, Japan)

ALMA polarization observations towards protoplanetrary disks

Thiem HOANG (KASI, South Korea)

Dust alignment theory

Emmanuael MOMJIAN (NRAO, U.S.A.)

Zeeman effect observations with Jansky VLA, interferometric calibrations in circular polarization observations

Jiro SHIMODA (Tohoku U., Japan)

Roles of B fields in cosmic ray acceleration, and its impact on the interstellar medium

Ken OHSUGA (Tsukuba U., Japan)

Effects of magnetic field on active galactic nuclei (accretion-disk scale)

Kouichiro NAKANISHI (NAOJ, Japan)

Prospects for ALMA's polarimetry toward nearby galaxies and their internal structures

Takuya AKAHORI (NAOJ, Japan)

Faraday tomography: probing the Galactic and intergalactic magnetic field structures from rotation measures (RMs) of extragalactic radio sources

Practical information

* Invited talks = 40 min.(including several-minutes discussion time)

* Abstract can be submitted via registration form

* Registration fee = free


* The meeting starts on March 26, 10:00, and ends at March 29, 15:00.

*  The meeting will be held at Mitaka campus, https://www.nao.ac.jp/en/access/mitaka/

* On March 25 (Monday), we organize a 1-day “Polarimetry School”

where all the tutorials will be given in Japanese language.

* CHILDCARE service (for children under ages of six) is available during the meeting. If you want to use the service, please submit your request via registration form.


Fukagwa, M. (NAOJ), Furuya, R. S. (Tokushima U.), Hasegawa, T., Hull, C. (NAOJ), Inoue, T. (Nagoya U.), Izumi, T., Kataoka, A. (NAOJ), Kudoh, Y. (Kagoshima U.), Matsumura, M. (Kagawa U.), Shinnaga, H. (Kagoshima U.), Takahashi, S. (JAO & NAOJ), Tazaki, R. (Tohoku U.), Tomida, K. (Osaka U.), Tokuda, K. (Osaka Pref. U. & NAOJ), Tomisaka, K. (NAOJ)

Contact address

pol_ALMAera2019 at  googlegroups.com