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APPENDIX

A.1 Catalogue of radio surveys of the Milky Way

Table 2: All-sky or all-hemisphere radio total intensity surveys
Frequency Beam Reference
45 MHz 4° Guzmán et al. 2011
150 MHz 3°.6 Landecker & Wielebinski 1970
408 MHz 2° Haslam et al. 1982
1.4 GHz 0°.6 Reich 1982; Reich & Reich 1986; Reich et al. 2001
2.3 GHz 0°.33 Jonas et al. 1998 (southern hemisphere)
2.7 GHz 0°.33 Reif et al. 1987 (northern hemisphere)
23 - 94 GHz 0.°8 - 0°.2 Hinshaw et al. 2009

Table 3: All-sky or all-hemisphere radio polarization surveys
Frequency Beam Reference
408 MHz 7.5° Wielebinski et al. 1962 (northern hemisphere)
2° Berkhuijsen & Brouw 1963 (northern hemisphere)
7.5° Wielebinski & Shakeshaft 1964 (northern hemisphere)
≈ 1° Mathewson & Milne 1965 (southern hemisphere)
300 MHz - 1.8 GHz 30' - 60' Wolleben et al. 2009; 2010a (northern hemisphere)
1.4 GHz 36' Wolleben et al. 2006; Testori et al. 2008
1.4 GHz ≈ 13' Rudnick & Brown 2009 (northern hemisphere)
23 - 94 GHz 0.°8 - 0°.2 Kogut et al. 2007; Hinshaw et al. 2009

Table 4: Radio surveys of the Galactic plane with angular resolutions of a few arcminutes
Frequency Beam Area (Galactic coordinates) Reference
325 MHz ≈ 4' selected areas Wieringa et al. 1993
350 MHz ≈ 5' selected areas Haverkorn et al. 2003; 2004
408 MHz ≈ 1' 147.3° > l > 74.2° -7.7° < b < 8.7° Taylor et al. 2003
1.4 GHz ≈ 1' 147.3° > l > 74.2° -3.6° < b < 5.6° Taylor et al. 2003
1.4 GHz ≈ 1' 67° > l > 18° b ± 1°.5 Stil et al. 2006
1.4 GHz (PI) ≈ 1' 358° > l > 253° b ± 1°.5 Haverkorn et al. 2006
1.4 GHz (PI) ≈ 1' 175° > l > 66° -3° Landecker et al. 2010
1.4 GHz 9' 162° > l > 93° b ± 4° Kallas & Reich 1980
1.4 GHz 9.4' 240° > l > 95.5° -4° < b < 5° Reich et al. 1990a; 1997
1.4 GHz (PI) 9' selected areas Uyaniker et al. 1999
1.4 GHz ≈ 1' 332.5° > l > 325.5° -0.5° < b < 3.5° Gaensler et al. 2001
2.4 GHz 10.4' 238° > l > 365° b ± 5° Duncan et al. 1995
2.4 GHz (PI) 10.4' 238° > l > 5° b ± 5° Duncan et al. 1997
2.7 GHz 4.3' 357.4° < l < 76° b ± 1.5° Reich et al. 1984
2.7 GHz (PI) 6' 74° > l > 4°.9 b ± 1.5° Junkes et al. 1987
2.7 GHz 4.4' 76° > l > 358° b ± 5° Reich et al. 1990b
2.7 GHz 4.4' 240° > l > 76° b ± 5° Fürst et al. 1990
2.7 GHz (PI) 4.3' 74° > l > 4°.9 b ± 5° Duncan et al. 1999
5 GHz (PI) 9' 129° > l > 122° b ± 5° Sun et al. 2007
5 GHz (PI) 9' 230° > l > 129° b ± 5° Gao et al. 2010
5 GHz (PI) 9' 122° > l > 60° b ± 5° Xiao et al. 2011
5 GHz (PI) 9' 60° > l > 10° b ± 5° Sun et al. 2011
(PI): with polarization data

A.2. Catalogue of radio polarization observations of nearby galaxies

In radio continuum the typical degrees of polarization are much higher than those in the other spectral ranges, and further benefit comes from the development of large instruments and sensitive receivers. This is why almost all of our knowledge on interstellar magnetic fields in galaxies is based on their polarized radio emission and Faraday rotation.

A list of spiral, barred, irregular and dwarf galaxies detected in radio polarization until year 2010 is given in Tables 5, 6 and 7. Most detections were made in the wavelength range 2-13 cm where Faraday depolarization is small. At lambda ≈ 20 cm, the polarized intensity is generally smaller by a factor of several (Fig. 3). At wavelengths of more than 20 cm, no detection of polarized emission from spiral galaxies has been reported so far.

Table 5: Radio polarization observations and magnetic field structures of galaxies with low or moderate inclination
Galaxy Telescope & lambda (cm) Structure Reference
M33 E21,18,11,6,3 BSS Buczilowski & Beck 1991
E6,4, V21 ASS+BSS+QSS Tabatabaei et al. 2008
M51 W21,6 Spiral Segalovitz et al. 1976
V21,18 Spiral Horellou et al. 1992
E6,3, V21,6 ASS+BSS (disk) +ASS (halo) Neininger 1992; Berkhuijsen et al. 1997
W21 BSS (halo) Heald et al. 2009
E6,4, V21,6,4 ASS+QSS (disk), +BSS (halo) Fletcher et al. 2011
M81 E6, V21 BSS Krause et al. 1989b
E6, V21 BSS (+ASS) Sokoloff et al. 1992
V21,6 Interarm fields Schoofs 1992
M83 V21 Spiral Sukumar & Allen 1989
P6 Spiral Harnett et al. 1990
E6,3 BSS? Neininger et al. 1991; 1993
A13 Magnetic arms Ehle 1995
V6 Magnetic arms + || bar Beck 2005
M101 E11,6,3 Spiral Gräve et al. 1990
E11,6 Spiral Berkhuijsen et al., unpubl.
NGC0628 W21 Incomplete spiral Heald et al. 2009
NGC0660 V6 || polar ring +X-shape Drzazga et al. 2011
NGC0877 V6 Spiral Drzazga et al. 2011
NGC1097 V21,18,6,4 ASS+BSS+QSS +|| bar +nuclear spiral Beck et al. 2005a
NGC1365 V21,18,6,4 ASS+BSS+QSS +|| bar +nuclear spiral Beck et al. 2005a
NGC1559 A13,6 || bar Beck et al. 2002
NGC1566 A21,13,6 Spiral, interarm Ehle et al. 1996
NGC1569 W21, V6,3 Spiral, bubbles, loops Kepley et al. 2010
NGC1672 A13,6 Spiral, interarm Beck et al. 2002
NGC2207 V6 Spiral +radial streamers Drzazga et al. 2011
NGC2276 V21,6 BSS? Hummel & Beck 1995
NGC2403 E11,6 Spiral Beck unpubl.
W21 Diffuse Heald et al. 2009
NGC2442 A13,6 Spiral + || bar Harnett et al. 2004
NGC2841 W21 Two arcs Heald et al. 2009
NGC2903 E6,3, V21 Spiral Beck, unpubl.
W21 Spiral Heald et al. 2009
NGC2997 V21,6,4, A13 Spiral +inner ASS? Han et al. 1999
NGC3521 E 3 Spiral, compressed Knapik et al. 2000
NGC3627 E3 Spiral +|| dust lane Soida et al. 1999
V6,4 Anomalous arm Soida et al. 2001
W21 Spiral Heald et al. 2009
E11 Spiral Nikiel-Wroczyski et al. 2013a
NGC3938 W21 Spiral Heald et al. 2009
NGC4038 V21,6,4 || tidal arm Chyzy & Beck 2004
NGC4214 V6 No ordered field Kepley et al. 2010
E6 Fragment of a spiral Drzazga 2008
NGC4258 W21, V21 In anomalous arms van Albada & van der Hulst 1982
V21,6 || anomalous arms Hummel et al. 1989
V4, E3 || nuclear jet + an. arms Krause & Löhr 2004
NGC4414 V6,4 ASS+BSS+QSS Soida et al. 2002
NGC4449 E6,3 || opt. filaments Klein et al. 1996
V6,4 Spiral+radial field Chyzy et al. 2000
NGC4490 / 85 E6,4 Radial halo field Knapik et al. in prep.
NGC4736 V6,4 Spiral, ASS? Chyzy & Buta 2008
W21 Outer lobe Heald et al. 2009
NGC5033 W21 Inner disk Heald et al. 2009
NGC5055 E3 Spiral Knapik et al. 2000
W21 Spiral Heald et al. 2009
NGC5426 / 7 V6 Spiral +spiral Drzazga et al. 2011
NGC6822 E11,6,3 No ordered field Chyzy et al. 2003; 2011
NGC6907 V6 Spiral Drzazga et al. 2011
NGC6946 E11,6,3 ASS? Ehle & Beck 1993
V21,18,6,4 ASS+QSS Beck 1991; 2007
W21 ASS (halo) Heald et al. 2009
NGC7479 V21,6,4 || spiral jet