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

By M. Wolleben, T. Landecker, W. Reich, R. Wielebinski. 2005

173 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/2b592df46d033c92b2c96c2e0b4a14c02269c8cc

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Citations in the corpus

Radio observational constraints on Galactic 3D-emission models (2007, methodology): “…all-sky polarization map exists at 1.4 GHz (Reich et al., in prep.) combining the northern sky survey carried out with the DRAO 26-m telescope (Wolleben et al. 2006), which is tied to the absolute level of the 1.4 GHz Leiden survey (Brouw & Spoelstra 1976), and the Villa Elisa southern sky…”
B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data (2006, unknown): “Similar results are obtained by La Porta et al. (2006) through the analysis of the 1.4 GHz sky at latitude |b| > 20◦ using the DRAO survey data (Wolleben et al. 2006).”
Planck 2015 results: XIX. Constraints on primordial magnetic fields (2015, unknown): “Maps of Stokes Q and U are provided by Wolleben et al. (2006) at 1.4 GHz and by Bennett et al. (2013) at 23 GHz.”
Planck intermediate results. XIX. An overview of the polarized thermal emission from Galactic dust (2014, methodology): “See, e.g., van de Hulst (1967) and Wolleben et al. (2006).”
Science with ASKAP (2008, background): “[283] we know that polarised structure exists at 1.”
Foregrounds for observations of the cosmological 21 cm line - I. First Westerbork measurements of Galactic emission at 150 MHz in a low latitude field (2009, methodology): “A full-sky absolutely-calibrated polarization map at 1.4 GHz with 0.5 ◦ resolution was recently published by Wolleben et al. (2006).”
Science with the Murchison Widefield Array (2012, background): “Depolarisation is already severe in the inner Galactic plane at 1.4 GHz (Reich et al. 1990; Wolleben et al. 2006; Haverkorn et al. 2006) and it is likely that much of the inner Galactic plane will appear completely depolarised below 300 MHz, although Bernardi et al. (2009) have detected polarized…”
H i intensity mapping: a single dish approach (2012, background): “Since the sky emission has significant linear polarization (∼ 10 % or more; Wolleben et al. (2006)), measuring with circularly polarized feeds is necessary.”