A.1 Catalogue of radio surveys of the Milky Way
| 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 |
| 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 |
| 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
≈ 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.
| Galaxy | Telescope &
(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 | |