An absolutely calibrated survey of polarized emission from the northern sky at 1.4 GHz

Free access article

Issue		A&A Volume 448, Number 1, March II 2006


Page(s)		411 - 424
Section		On-line catalogs and data
DOI		http://dx.doi.org/10.1051/0004-6361:20053851

A&A 448, 411-424 (2006)
DOI: 10.1051/0004-6361:20053851

Observations and data reduction

M. Wolleben¹, T. L. Landecker², W. Reich¹ and R. Wielebinski¹

¹ Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
e-mail: maik.wolleben@nrc-cnrc.gc.ca
² National Research Council of Canada, Herzberg Institute of Astrophysics, Dominion Radio Astrophysical Observatory, Box 248, Penticton, B.C., V2A 6J9, Canada

(Received 19 July 2005 / Accepted 7 October 2005 )

Abstract
A new polarization survey of the northern sky at 1.41 GHz is presented. The observations were carried out using the 25.6 m telescope at the Dominion Radio Astrophysical Observatory in Canada, with an angular resolution of $36\arcmin$ . The data are corrected for ground radiation to obtain Stokes U and Q maps on a well-established intensity scale tied to absolute determinations of zero levels, containing emission structures of large angular extent, with an rms noise of 12 mK. Survey observations were carried out by drift scanning the sky between -29° and +90° declination. The fully sampled drift scans, observed in steps of $0.25^\circ$ to $\sim 2.5^\circ$ in declination, result in a northern sky coverage of 41.7% of full Nyquist sampling. The survey surpasses by a factor of 200 the coverage, and by a factor of 5 the sensitivity, of the Leiden/Dwingeloo polarization survey that was until now the most complete large-scale survey. The temperature scale is tied to the Effelsberg scale. Absolute zero-temperature levels are taken from the Leiden/Dwingeloo survey after rescaling those data by the factor of 0.94. The paper describes the observations, data processing, and calibration steps. The data are publicly available at http://www.mpifr-bonn.mpg.de/div/konti/26msurvey or http://www.drao.nrc.ca/26msurvey.

Key words: surveys -- polarization -- radio continuum: general -- methods: observational -- instrumentation: polarimeters -- magnetic fields

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