Extreme-infrared (800 microns) polarimetry at the JCMT of the W 75N-IRS 1 cloud

Details Extreme-infrared (800 microns) polarimetry at the JCMT of the W 75N-IRS 1 cloud Extreme-infrared (800 microns) polarimetry at the JCMT of the W 75N-IRS 1 cloud

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...294..831v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 294, no. 3, p. 831-834

Astronomy and Astrophysics

Astronomy

15

Astronomical Polarimetry, Cosmic Dust, Infrared Astronomy, Infrared Radiation, Interstellar Matter, Linear Polarization, Star Formation, Astronomical Models, H Ii Regions, Infrared Detectors, Magnetic Fields, Radio Spectra

Scientific paper

We have used the 15 m James Clerk Maxwell Telescope (JCMT) to obtain the linear polarization and total continuum observations in the extreme infrared (at a wavelength of 800 microns) of the compact dust cloud W 75N-IRS 1. We observed a polarization of 0.7% +/- 0.24% at a position angle of 55 deg +/- 5 deg, and an integrated total continuum flux density of 33.2 Jy over a mean (deconvolved) source size of 12 sec. Extreme-infrared (i.e., submm wavelengths) polarization measurements can yield directly the magnetic field direction, a valuable tool for understanding the geometry and physics of the region involved. We use a dust model to interpret the emission, inferring a mean gas density of 3 x 106/cu cm, and a magnetic field direction toward a position angle of 145 deg. This direction is roughly parallel to the major axis of the dense dusty cloud, and nearly perpendicular to the axis of a CO outflow from this cloud.

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