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SUBMILLIMETER POLARIZATION SPECTRUM IN THE VELA C MOLECULAR CLOUD

Journal Article · · Astrophysical Journal
 [1]; ;  [2]; ; ; ; ;  [3]; ; ; ;  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];
  1. Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street Toronto, ON M5S 3H4 (Canada)
  2. Cardiff University, School of Physics and Astronomy, Queens Buildings, The Parade, Cardiff, CF24 3AA (United Kingdom)
  3. Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA, 19104 (United States)
  4. Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 (United States)
  5. Department of Physics, Princeton University, Jadwin Hall, Princeton, NJ 08544 (United States)
  6. Department of Physics and Astrophysics, Nagoya University, Nagoya 464-8602 (Japan)
  7. Department of Physics, Brown University, 182 Hope Street, Providence, RI, 02912 (United States)
  8. Department of Astronomy, University of Virginia, 530 McCormick Road, Charlottesville, VA 22904 (United States)
  9. CITA, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8 (Canada)
  10. California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA, 91125 (United States)
  11. National Astronomical Observatory, Mitaka, Tokyo 181-8588 (Japan)
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Polarization maps of the Vela C molecular cloud were obtained at 250, 350, and 500 μ m during the 2012 flight of the balloon-borne telescope BLASTPol. These measurements are used in conjunction with 850 μ m data from Planck to study the submillimeter spectrum of the polarization fraction for this cloud. The spectrum is relatively flat and does not exhibit a pronounced minimum at λ ∼ 350 μ m as suggested by previous measurements of other molecular clouds. The shape of the spectrum does not depend strongly on the radiative environment of the dust, as quantified by the column density or the dust temperature obtained from Herschel data. The polarization ratios observed in Vela C are consistent with a model of a porous clumpy molecular cloud being uniformly heated by the interstellar radiation field.
OSTI ID:
22666173
Journal Information:
Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 824; ISSN ASJOAB; ISSN 0004-637X
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMIC DUST
COSMIC GASES
DENSITY
INTERSTELLAR SPACE
MAGNETIC FIELDS
POLARIMETERS
POLARIZATION
POROUS MATERIALS
SPECTRA
STARS
TELESCOPES