2009A&A...503..409H


Query : 2009A&A...503..409H

2009A&A...503..409H - Astronomy and Astrophysics, volume 503, 409-435 (2009/8-4)

The Westerbork SINGS survey. II. Polarization, Faraday rotation, and magnetic fields.

HEALD G., BRAUN R. and EDMONDS R.

Abstract (from CDS):

A sample of large northern Spitzer Infrared Nearby Galaxies Survey (SINGS) galaxies has recently been observed with the Westerbork Synthesis Radio Telescope (WSRT). We present observations of the linearly polarized radio continuum emission in this WSRT-SINGS galaxy sample. Of the 28 galaxies treated in this paper, 21 are detected in polarized radio continuum at 18- and 22-cm wavelengths. We utilize the rotation measure synthesis (RM-Synthesis) method, as implemented by Brentjens & de Bruyn (2005A&A...441.1217B), to coherently detect polarized emission from a large fractional bandwidth, while simultaneously assessing the degree of Faraday rotation experienced by the radiation along each line-of-sight. This represents the first time that the polarized emission and its Faraday rotation have been systematically probed down to ∼10µJy/beam RMs for a large sample of galaxies. Non-zero Faraday rotation is found to be ubiquitous in all of the target fields, from both the Galactic foreground and the target galaxies themselves. In this paper, we present an overview of the polarized emission detected in each of the WSRT-SINGS galaxies. The most prominent trend is a systematic modulation of the polarized intensity with galactic azimuth, such that a global minimum in the polarized intensity is seen toward the kinematically receding major axis. The implied large-scale magnetic field geometry is discussed in a companion paper. A second novel result is the detection of multiple nuclear Faraday depth components that are offset to both positive and negative RM by 100-200rad/m2 in all targets that host polarized (circum-)nuclear emission.

Abstract Copyright:

Journal keyword(s): ISM: magnetic fields - galaxies: magnetic fields - radio continuum: galaxies

Simbad objects: 38

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Number of rows : 38
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1553 1
2 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 731 1
3 ICRF J052109.8+163822 Sy1 05 21 09.8855216664 +16 38 22.054553988   19.37 18.84 18.480   ~ 804 1
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16002 1
5 ICRF J054236.1+495107 Sy1 05 42 36.1380355416 +49 51 07.232213736   18.45 17.80 17.210   ~ 1383 1
6 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1692 1
7 6C 0812+7047 Rad 08 17 34.7 +70 37 54           ~ 1 0
8 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 727 2
9 NGC 2841 LIN 09 22 02.6778711696 +50 58 35.737082868 10.43 10.09 9.22     ~ 1024 1
10 NGC 2905 H2G 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 1050 3
11 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 622 1
12 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 668 0
13 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 850 1
14 IC 2574 G 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 633 1
15 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1262 4
16 NGC 3938 GiG 11 52 49.4335936248 +44 07 14.697085116 10.80 10.90 10.38     ~ 492 1
17 NGC 4125 GiP 12 08 06.017 +65 10 26.88 11.14 10.65 9.72     ~ 408 2
18 NGC 4236 GiG 12 16 42.118 +69 27 45.25 10.97 10.58 10.08 9.90   ~ 377 1
19 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 839 2
20 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1739 2
21 NGC 4414 GiG 12 26 27.1276893168 +31 13 24.626206488 11.12 10.96 10.12     ~ 539 2
22 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6250 0
23 NGC 4450 LIN 12 28 29.5910654016 +17 05 05.976112020   10.90 10.08     ~ 532 2
24 NGC 4559 H2G 12 35 57.6402869976 +27 57 35.859278160   10.46 10.01     ~ 574 1
25 IC 3583 GiG 12 36 43.558 +13 15 32.93   13.31       ~ 166 1
26 M 90 Sy2 12 36 49.8009839880 +13 09 46.523813040 10.56 10.26 9.54     ~ 846 1
27 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1024 2
28 NGC 4725 Sy2 12 50 26.5716367992 +25 30 02.733090588   13.45 12.44     ~ 649 2
29 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1302 2
30 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 876 2
31 NGC 5033 Sy1 13 13 27.535 +36 35 37.14   11.01 12.03 9.73   ~ 828 3
32 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1131 2
33 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4064 4
34 NGC 5195 GiP 13 29 59.590 +47 15 58.06 10.76 10.45 9.55 9.31   ~ 735 3
35 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4065 2
36 ICRF J160913.3+264129 Sy2 16 09 13.32076181 +26 41 29.0362080   19       ~ 218 0
37 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2373 2
38 NGC 7331 LIN 22 37 04.0506038088 +34 24 56.800076508 10.65 10.35 9.48     ~ 1164 2

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2022.05.25-20:52:53

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