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SOFIA Polarimetry: Recent Musings

This document discusses the recent developments in polarization science through SOFIA (Stratospheric Observatory for Infrared Astronomy) and its first-generation instruments, focusing on the importance of polarimetry in studying magnetic field strengths, turbulence in Class 0/I and Class II galaxies, and polarization spectra of giant molecular clouds (GMCs). The collaborative effort from various institutions emphasizes the need for a polarimeter for HAWC, examines design principles for efficient observation mode switching, and explores funding options for future enhancements in SOFIA's observational capabilities.

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SOFIA Polarimetry: Recent Musings

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  1. SOFIA Polarimetry:Recent Musings C. Darren Dowell JPL/Caltech 2007 August 14

  2. SOFIA 1st Generation Instruments

  3. SOFIA 1st Generation Instruments no polarimeter

  4. SOFIA Polarization Science Magnetic Field Strengths; Turbulence Class 0/I Class II Galaxies Polarization spectrum of GMCs What about tenuous clouds? Starless environments?

  5. SOFIA Polarization Science Magnetic Field Strengths; Turbulence Class 0/I Class II Galaxies Polarization spectrum of GMCs What about tenuous clouds? Starless environments?

  6. Participants: (S. Casey), J. Cho, D. Chuss, R. Crutcher, J. Dotson, D. Dowell, D. Falceta-Goncalves, P. Frisch, A. Harper, F. Heitsch, R. Hildebrand, T. Hoang, T. Jones, L. Kirby, M. Krejny, A. Lazarian, R. Loewenstein, L. Looney, (H. Moseley), G. Novak, (C. Packham), R. Pernic, D. Sandford, (M. Savage), J. Vaillancourt, (M. Werner), J. Wirth, G. Wolf-Chase Representing: Ames, Caltech, Chicago, Florida, Goddard, Illinois, JPL, S. Korea, Michigan, Minnesota, Northwestern, Wisconsin Unanimous support for an interim solution: polarimeter for HAWC HAWC polarimeter options: cold, spinning half-wave plates at pupil wheel warm variable-delay polarization modulator in foreoptics Design principles: goal of facility observing mode switch from camera mode to polarization mode without opening cryostat air worthiness approval parallel development (JPL/Caltech?); outside HAWC critical path integrate with HAWC after HAWC is ready for SOFIA SOFIA Polarimetry MeetingChicago area, July 2007

  7. HAWC Polarimeter Options spinning half-wave plates

  8. HAWC Polarimeter Options reflective modulator

  9. HAWC Polarimeter Options • estimated cost for either option: $1M spinning half-wave plates

  10. Excellent Sensitivity

  11. Paths to SOFIA Polarimetry • Polarimetry will be well-represented at August SPIE session “SOFIA Instrumentation” • Chris Packham: mid-IR (based on FORCAST) • John Vaillancourt: far-IR (HAWCHale) • Seed funding possibilities: • JPL R&D fund: $200k? • NASA ROSES: ??? • SOFIA first-generation upgrade program? • SOFIA second generation instrument program • Hale (“SuperHAWC”): 5000 pixel far-IR camera / polarimeter, advanced mapping capability (entire GMCs)

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