Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.291..279d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 291, Issue 2, pp. 279-295.
Astronomy and Astrophysics
Astronomy
82
Polarization, Surveys, Supernova Remnants, Galaxy: Structure
Scientific paper
Polarimetric results from the Parkes 2.4-GHz survey of the southern Galactic plane are presented. These take the form of a series of images, detailing the polarized intensity and vector position angles over the survey area. The observations were made using the 64-m Parkes radio telescope, and cover the Galactic plane within the region 238 deg<=l<=5 deg, with a latitude range of at least --b--<=5 deg, with some coverage to b=+7 deg and b=-8 deg. The resolution of the images is 10.4 arcmin. The rms noise of the polarized intensity images is 11 mJy beam area^-1 (5.3 mK), and the rms variation in the vector position angles is of the order of several dgrees. The images show many polarized structures, over a wide range of intensities and angular sizes. Bright, extended regions of polarized emission (of the order of 5 deg across) are detected, including the Vela supernova remnant and a large `cap' structure appearing to the north of SgrA. A quasi-uniform `background' component of faint, patchy emission is seen over the length of the survey. This faint component appears to originate over a range of distances, out to greater than 5 kpc, and shows considerable structure in the orientations of the polarization vectors. Several bright Hii complexes are seen to exhibit bipolar, depolarizing `plumes', several degrees in length, which are interpreted as outflows of low-density thermal material (with densities in the range 1-10 cm^-3).
Duncan Roy A.
Haynes Raymond F.
Jones Kenneth L.
Stewart Ron T.
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