Submillimeter Polarization Spectrum of the Carina Nebula

Linear polarization maps of the Carina Nebula were obtained at 250, 350, and 500 m during the 2012 flight of the Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry (BLASTPol). These measurements are combined with Planck 850 m data in order to produce a submillimeter spectrum of the...

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Bibliographic Details
Published in:	The Astrophysical journal 2019-02, Vol.872 (2), p.197
Main Authors:	Shariff, Jamil A., Ade, Peter A. R., Angilè, Francesco E., Ashton, Peter, Benton, Steven J., Devlin, Mark J., Dober, Bradley, Fissel, Laura M., Fukui, Yasuo, Galitzki, Nicholas, Gandilo, Natalie N., Klein, Jeffrey, Korotkov, Andrei L., Li, Zhi-Yun, Martin, Peter G., Matthews, Tristan G., Moncelsi, Lorenzo, Nakamura, Fumitaka, Netterfield, Calvin B., Novak, Giles, Pascale, Enzo, Poidevin, Frédérick, Santos, Fabio P., Savini, Giorgio, Scott, Douglas, Soler, Juan Diego, Thomas, Nicholas E., Tucker, Carole E., Tucker, Gregory S., Ward-Thompson, Derek
Format:	Article
Language:	eng
Subjects:	Apertures Astrophysics Clouds Dust Dust emission dust, extinction instrumentation: polarimeters ISM: individual objects (Carina) ISM: magnetic fields Linear polarization Molecular clouds Nebulae Optical analysis Optical thickness Polarimetry Polarization
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Summary:	Linear polarization maps of the Carina Nebula were obtained at 250, 350, and 500 m during the 2012 flight of the Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry (BLASTPol). These measurements are combined with Planck 850 m data in order to produce a submillimeter spectrum of the polarization fraction of the dust emission, averaged over the cloud. This spectrum is flat to within 15% (relative to the 350 m polarization fraction). In particular, there is no evidence for a pronounced minimum of the spectrum near 350 m, as suggested by previous ground-based measurements of other molecular clouds. This result of a flat polarization spectrum in Carina is consistent with recently published BLASTPol measurements of the Vela C molecular cloud and also agrees with a published model for an externally illuminated, dense molecular cloud by Bethell and collaborators. The shape of the spectrum in Carina does not show any dependence on the radiative environment of the dust, as quantified by the Planck-derived dust temperature or dust optical depth at 353 GHz.
ISSN:	0004-637X 1538-4357