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Sep 16 – 20, 2019
University of Stuttgart, Campus Vaihingen
Europe/Berlin timezone

Cosmic dust and spectral line polarization as analytical tools: Bridging spatial and spectral scales & SOFIA's promise


Thursday, September 19, 14:00-18:30

Room: 9.12

Helmut Wiesemeyer (MPIfR Bonn)
Gesa H.-M. Bertrang (MPIA Heidelberg)
Fabio Pereira Santos (MPIA Heidelberg)

In the past years, great efforts were undertaken to measure the Stokes parameters of continuum and spectral line emission across a variety of cosmic environments. This splinter meeting is motivated by the arrival of polarimetry data from SOFIA and other observatories, operating from optical to radio wavelengths and including interferometers. We intend to offer an opportunity to present recent, exciting data and simulations as well as to discuss open questions and pending tests.

We invite contributions from various fields, out of which we suggest the following topics (the list is not exhaustive):

  • For the first time, it is possible to obtain the spectral energy distribution of dust polarization, thanks to HAWC+ and other recently commissioned polarimeter cameras. Are we ready to use it as an analytical tool, e.g., for magnetic field tomography? If so, what is the contribution of Zeeman measurements?

  • How sensitive is dust polarization to magnetic field structure? How can polarized emission be used, by itself or in combination with stellar polarimetry data, to probe grain alignment efficiency in molecular clouds? What is the role of alternative alignment processes?

  • What is the dynamical role of magnetic fields in the formation of high-mass stars?

  • What is the role of magnetic fields in the formation of molecular clouds out of cold, neutral matter? Is there a difference between the Galaxy and, e.g., the low metallicity environment of the Magellanic clouds?

  • What is the link between filamentary molecular cloud structures, the striations feeding them, and the stellar proto-clusters forming inside dense cores?

  • Recent observations of protoplanetary disks forming around low-mass stars have revealed a wealth of details. What is the role of the magnetic field in the angular momentum budget of the disks, at various evolutionary stages?

  • What is the role of magnetic fields in late stages of stellar evolution? Are they an important agent for shaping planetary nebulae?

The idea is to schedule short oral contributions and to leave ample time for discussions.

Looking forward to meeting you in Stuttgart!


30 min + 5 min discussion
Oral contributions: 20 min + 5 min discussion

14:00 B-G Andersson (review):
Radiative torque alignment of dust grains

14:35 Elena Redaelli (oral contribution):
Unveiling the magnetic field properties of a Class 0 protostar with SOFIA/HAWC+

15:00 – 15:50 Poster Session

16:00 Gesa Bertrang (oral contribution):
Line polarization to solve the polarizing puzzle in dusty disks

16:25 Fabio Santos (oral contribution):
The far-infrared polarization spectrum of Rho Ophiuchi A from HAWC+/SOFIA

16:50 Niko Zielinsky (oral contribution):
SOFIA/HAWC+ polarimetric observations of the Bok globule B335

17:15 – 17:30

17:30 Stefan Reissl (oral contribution):
The impact of grain alignment on polarized dust emission

17:55 Discussion