SHARP: The SHARC-II polarimeter at the Caltech Submillimeter Observatory

Details SHARP: The SHARC-II polarimeter at the Caltech Submillimeter Observatory SHARP: The SHARC-II polarimeter at the Caltech Submillimeter Observatory

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20913002v&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #130.02; Bulletin of the American Astronomical Society,

Physics

Optics

Scientific paper

The Submillimeter High Angular Resolution Camera II (SHARC-II) is a 12 × 32 pixel camera used with the 10 meter diameter Caltech Submillimeter Observatory (CSO). We have deployed an optics module between the telescope and camera which converts SHARC-II into a sensitive imaging polarimeter, "SHARP." The camera and polarimeter currently operate at wavelengths of 350 and 450 μm we are planning an additional passband at 620 μm. The incident beam is split into two orthogonally polarized components by the SHARP optics module and re-imaged onto opposite ends of the SHARC-II array. The result is a dual-beam 12 × 12 pixel polarimeter. The modular nature of the optics design allows the user to easily switch between polarimeter and camera modes during a single observing session. Here we review the optical design of SHARP, report on the instrument's performance, and review our data reduction methodology. SHARP will be used to study the magnetic field structure and dust emission properties in young stellar objects, Galactic clouds, and external galaxies. We present the first polarimetric maps of celestial sources made from SHARP observations and compare them to previous results.
This work has been supported by NSF grants AST 02-41356 and 05-05230 to Northwestern University and 05-05124 to the University of Chicago.

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