GALFA HI: Needles as a New Measure of Interstellar Magnetic Fields

Details GALFA HI: Needles as a New Measure of Interstellar Magnetic Fields GALFA HI: Needles as a New Measure of Interstellar Magnetic Fields

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934917g&link_type=abstract

American Astronomical Society, AAS Meeting #219, #349.17

Astronomy and Astrophysics

Astronomy

Scientific paper

We find that high resolution observations of the diffuse HI ISM show ubiquitous needle features: thin, dim, straight enhancements stretching many degrees across the sky. These features have only been recently uncovered by GALFA-HI due to the unprecedented combination of sensitivity, resolution, and area the survey provides. We present a new method to extract these features in a systematic and statistically robust way using a modified version of the Hough transform. We show a startlingly strong correlation between the orientation of these filaments and the orientation of the polarization of background starlight, indicating that needle orientation and magnetic orientation are very highly correlated. Needles can therefore act as a probe of magnetic orientation throughout the ISM and may be a probe of shearing or stretching in our Galaxy.

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