Polarimetry toward Musca dark cloud (Pereyra+, 2004)

Details Polarimetry toward Musca dark cloud (Pereyra+, 2004) Polarimetry toward Musca dark cloud (Pereyra+, 2004)

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ycat..26030584p&link_type=abstract

VizieR On-line Data Catalog: J/ApJ/603/584. Originally published in: 2004ApJ...603..584P

Astronomy and Astrophysics

Astronomy

Molecular Clouds, Polarization

Scientific paper

We have used CCD imaging polarimetry to obtain linear polarization measurements of background stars toward the filamentary Musca dark cloud. We present a catalog of 2497 objects with polarization signal-to-noise ratio larger than 5. This allows us to build polarization maps to infer the detailed geometry of the local magnetic field. We show composite polarization maps along the cloud and explore general correlations of the polarimetric data with the morphology of the region. We find the overall field to be strikingly aligned with the projected small axis of the filamentary cloud. We detect a lower limit for the polarization across the cloud of ~2%, with an enhanced polarization of 6%-7% in the central region. We find evidence that the polarization pattern is altered in the inner regions, those associated with higher extinction. The observations were made using IAGPOL, the IAG-USP imaging polarimeter, at the f/13.5 Cassegrain focus of the 0.6m IAG telescope at the Observatorio do Pico dos Dias, operated by the Laboratorio Nacional de Astrofisica, Brazil. We obtained linear polarization data for 35 CCD fields along the Musca dark cloud obtained in runs in 1996 April and 1997 April through a standard V filter.

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