2013ApJ...771..105B

Query : 2013ApJ...771..105B

2013ApJ...771..105B - Astrophys. J., 771, 105 (2013/July-2)

A 189 MHz, 2400 deg2 polarization survey with the Murchison Widefield Array 32-element prototype.

BERNARDI G., GREENHILL L.J., MITCHELL D.A., ORD S.M., HAZELTON B.J., GAENSLER B.M., DE OLIVEIRA-COSTA A., MORALES M.F., UDAYA SHANKAR N., SUBRAHMANYAN R., WAYTH R.B., LENC E., WILLIAMS C.L., ARCUS W., ARORA B.S., BARNES D.G., BOWMAN J.D., BRIGGS F.H., BUNTON J.D., CAPPALLO R.J., COREY B.E., DESHPANDE A., DESOUZA L., EMRICH D., GOEKE R., HERNE D., HEWITT J.N., JOHNSTON-HOLLITT M., KAPLAN D., KASPER J.C., KINCAID B.B., KOENIG R., KRATZENBERG E., LONSDALE C.J., LYNCH M.J., McWHIRTER S.R., MORGAN E., OBEROI D., PATHIKULANGARA J., PRABU T., REMILLARD R.A., ROGERS A.E.E., ROSHI A., SALAH J.E., SAULT R.J., SRIVANI K.S., STEVENS J., TINGAY S.J., WATERSON M., WEBSTER R.L., WHITNEY A.R., WILLIAMS A. and WYITHE J.S.B.

Abstract (from CDS):

We present a Stokes I, Q and U survey at 189 MHz with the Murchison Widefield Array 32 element prototype covering 2400 deg2. The survey has a 15.6 arcmin angular resolution and achieves a noise level of 15 mJy/beam. We demonstrate a novel interferometric data analysis that involves calibration of drift scan data, integration through the co-addition of warped snapshot images, and deconvolution of the point-spread function through forward modeling. We present a point source catalog down to a flux limit of 4 Jy. We detect polarization from only one of the sources, PMN J0351-2744, at a level of 1.8%±0.4%, whereas the remaining sources have a polarization fraction below 2%. Compared to a reported average value of 7% at 1.4 GHz, the polarization fraction of compact sources significantly decreases at low frequencies. We find a wealth of diffuse polarized emission across a large area of the survey with a maximum peak of ∼13 K, primarily with positive rotation measure values smaller than +10 rad/m2. The small values observed indicate that the emission is likely to have a local origin (closer than a few hundred parsecs). There is a large sky area at α ≥ 2h30m where the diffuse polarized emission rms is fainter than 1 K. Within this area of low Galactic polarization we characterize the foreground properties in a cold sky patch at (α, δ) = (4h, -27.°6) in terms of three-dimensional power spectra.

Abstract Copyright: ∼

Journal keyword(s): diffuse radiation - ISM: magnetic fields - polarization - radio continuum: general - surveys - techniques: interferometric

VizieR on-line data: <Available at CDS (J/ApJ/771/105): table2.dat>

Simbad objects: 140

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Number of rows : 140
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cul 0000-362 G 00 03 13.48 -35 56 40.3     20     ~ 9 1
2 [HB93] 0000-177 QSO 00 03 21.9552714408 -17 27 11.876337648     19.00     ~ 44 1
3 PKS J0020-2014 rG 00 20 26.43 -20 14 21.0           ~ 16 1
4 LEDA 1348 Sy2 00 21 07.5323168664 -19 10 05.568349404   13.2   12.7   ~ 56 1
5 PKS 0020-25 rG 00 23 09.20 -25 02 37.0     20     ~ 24 1
6 LEDA 2822170 Sy2 00 24 30.1497156456 -29 28 54.448830876     20.0     ~ 67 1
7 MCG-06-02-003 rG 00 25 31.469 -33 02 45.88   14.27   12.56   ~ 46 0
8 QSO B0023-263 BLL 00 25 49.15629900 -26 02 12.6141092   20.30 19.5 18.084   ~ 173 1
9 PKS 0023-20 rG 00 26 13.98 -20 04 58.8           ~ 19 1
10 PKS 0032-20 rG 00 35 08.7871134628 -20 03 59.401301253     20.1     ~ 38 1
11 PKS 0042-35 Rad 00 44 41.01 -35 30 33.4           ~ 27 1
12 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
13 PKS 0057-18 rG 01 00 10.2451193928 -17 49 00.963289128     18.0     ~ 11 1
14 MCG-04-03-044 rG 01 02 41.43 -21 52 41.8   14.54 15.1 12.94   ~ 77 3
15 PKS J0102-2731 rG 01 02 44.22 -27 31 28.5           ~ 9 1
16 PKS 0106-291 rG 01 08 37.93 -28 51 27.9           ~ 12 1
17 PKS 0107-350 Rad 01 09 25.26 -34 47 14.2           ~ 6 1
18 PKS 0114-21 rG 01 16 51.40488104 -20 52 06.8906316     16.5     ~ 91 1
19 PKS 0115-261 rG 01 18 15.78 -25 51 47.4     16.7     ~ 17 1
20 PKS 0116-19 rG 01 18 34.2424877568 -18 49 17.320332036   18.60 18.0 17.12   ~ 20 1
21 PKS 0122-25 rG 01 24 45.04 -25 17 17.8     18.5     ~ 20 1
22 PKS J0130-2610 rG 01 30 27.5519 -26 09 50.648           ~ 22 1
23 PKS J0141-2706 rG 01 41 27.158 -27 06 06.60           ~ 26 1
24 PKS 0148-297 rG 01 50 34.320 -29 32 43.63           ~ 26 1
25 NVSS J015201-294059 BLL 01 52 00.87046560 -29 40 57.8863560           ~ 19 1
26 PKS 0154-365 rG 01 56 47.6023568191 -36 16 10.154268689           ~ 12 2
27 QSO J0200-3053 QSO 02 00 12.1757038704 -30 53 26.673024840   19.0 19.6     ~ 62 1
28 PKS J0205-1801 Rad 02 05 20.17 -18 01 35.6           ~ 6 1
29 PKS J0211-2351 rG 02 11 17.5229365756 -23 51 23.441255283           ~ 15 1
30 PKS J0217-1757 Rad 02 17 34.26 -17 57 42.2           ~ 5 1
31 PKS 0216-25 rG 02 18 44.135 -24 48 16.22           ~ 15 1
32 PKS J0223-2819 rG 02 23 43.798 -28 18 57.41           ~ 11 1
33 ICRF J022502.8-231248 Sy1 02 25 02.8213027584 -23 12 48.487774356   18.92 18.0 17.67   ~ 76 1
34 PKS 0225-308 rG 02 27 20.281 -30 37 46.65     18.5     ~ 7 1
35 6dFGS gJ023137.0-204022 BLL 02 31 36.9934436904 -20 40 21.646251480   17.51   15.96   ~ 32 0
36 PKS 0231-23 rG 02 33 24.741 -23 21 04.70           ~ 19 1
37 PKS J0237-1932 Sy1 02 37 43.4632080699 -19 32 33.658238490     21.3     ~ 76 1
38 PKS J0248-2931 rG 02 47 58.23 -29 31 15.7           ~ 10 1
39 PKS J0256-2324 rG 02 56 14.4 -23 25 08           ~ 13 1
40 PKS 0256-236 rG 02 58 51.634 -23 29 50.37           ~ 11 1
41 QSO B0258-344 QSO 03 00 36.1903818408 -34 14 05.457947388   18 18.0     ~ 17 1
42 PKS 0305-226 rG 03 07 31.4657 -22 25 14.822     18.5     ~ 15 1
43 LEDA 2823460 rG 03 16 03.32 -26 58 00.2           ~ 10 1
44 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
45 LEDA 738553 Sy2 03 28 36.522 -28 41 55.47   17.064   15.943   ~ 69 1
46 PKS J0329-2600 rG 03 29 11.194 -26 00 03.68           ~ 8 1
47 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
48 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
49 LEDA 132162 AGN 03 46 30.5792409552 -34 22 46.230872124   16.26       ~ 43 1
50 LEDA 13982 Sy2 03 51 35.7643720392 -27 44 34.896912468   16.0       ~ 157 1
51 TXS 0406-244 QSO 04 08 51.463920 -24 18 16.40880     22.40     ~ 82 1
52 QSO B0406-180 QSO 04 09 06.6760356072 -17 57 10.228755816     19.0     ~ 37 1
53 PKS J0411-3513 Rad 04 11 22.20 -35 13 03.8           ~ 6 1
54 PKS 0411-34 Rad 04 13 00.869 -34 30 09.31           ~ 11 1
55 QSO B0413-296 QSO 04 15 08.6933643384 -29 29 03.254910792     19.0     ~ 24 1
56 QSO B0413-210 QSO 04 16 04.35973734 -20 56 27.5175262   18.5 18.5     ~ 91 1
57 PKS J0422-2616 rG 04 22 34.26 -26 16 48.9     18.5     ~ 13 1
58 2MASS J04234687-3402422 BLL 04 23 46.8854290976 -34 02 42.332328420           ~ 10 1
59 PKS 0424-26 rG 04 26 41.02847 -26 43 54.5230   17       ~ 22 1
60 PKS J0432-2956 Rad 04 33 00.393 -29 56 14.61           ~ 7 1
61 QSO B0435-300 BLL 04 37 36.5686975680 -29 54 04.117331088     17.5     ~ 48 1
62 LEDA 745026 Sy2 04 44 37.7077672896 -28 09 54.445127796   18.5       ~ 104 1
63 PKS 0446-20 rG 04 48 30.5629072752 -20 32 13.500255624   16.86   15.36   ~ 35 1
64 QSO B0450-221 QSO 04 52 44.7804085920 -22 01 19.894766376     18.5     ~ 35 1
65 PKS 0453-30 rG 04 55 14.2787262459 -30 06 48.748690569   18.5       ~ 35 1
66 NGC 1692 rG 04 55 23.7155967168 -20 34 16.066069536   14.21 14.0 12.70   ~ 97 1
67 QSO J0456-2159 Bla 04 56 08.9237717400 -21 59 09.399816312 15.76 16.16 16.10 15.9   ~ 196 1
68 PKS 0456-301 rG 04 58 25.6027926696 -30 07 07.685463612   18.0       ~ 19 1
69 PKS 0503-290 Rad 05 05 34.8 -28 56 26           ~ 1 0
70 PKS 0503-284 Rad 05 05 40.9 -28 24 26           ~ 2 0
71 PKS 0508-18 rG 05 10 31.923 -18 38 44.06     19.5     ~ 25 1
72 QSO B0508-220 BLL 05 11 00.5030720328 -22 01 54.703270776   16.9 18.5     ~ 29 1
73 PKS 0509-333 Rad 05 11 01.853 -33 15 59.58           ~ 5 1
74 LEDA 147136 Sy2 05 13 31.9712729664 -30 28 50.064973896   16.52 16.5 15.13   ~ 49 0
75 PKS 0519-20 rG 05 21 38.8879 -20 47 39.361           ~ 32 1
76 PKS 0521-329 rG 05 23 32.8746411432 -32 51 20.636222904     18.0     ~ 12 1
77 PKS J0525-3242 Rad 05 25 25.068 -32 41 45.60           ~ 4 1
78 PKS 0523-32 rG 05 25 27.1907409456 -32 42 15.523726896   16.0       ~ 32 0
79 PKS J0539-3412 Rad 05 39 48.535 -34 12 32.59           ~ 5 1
80 PKS 0538-331 Rad 05 40 17.165 -33 09 19.70           ~ 5 1
81 NVSS J054307-242102 BLL 05 43 07.47775920 -24 21 01.5614640           ~ 18 1
82 PKS 0554-32 Rad 05 56 15.544 -32 23 10.58           ~ 10 1
83 PKS 0601-34 rG 06 03 12.2273 -34 26 32.822           ~ 15 1
84 PMN J0603-3144 Rad 06 03 56.5 -31 44 33           ~ 3 1
85 PKS 2032-35 rG 20 35 47.6030 -34 54 09.696     22.5     ~ 45 1
86 PKS J2042-2855 rG 20 42 39.409 -28 55 38.10           ~ 11 1
87 PKS 2040-267 rG 20 43 43.44 -26 32 56.5           ~ 28 1
88 PMN J2050-2948 Rad 20 50 07.245 -29 49 29.87           ~ 5 1
89 PMN J2051-2702 rG 20 51 03.590 -27 03 02.52           ~ 37 1
90 PKS 2053-20 rG 20 56 04.2772181688 -19 56 35.394139824   19.0       ~ 56 1
91 PMN J2100-2828 rG 21 00 12.447 -28 29 07.44           ~ 12 1
92 PMN J2101-2802 Rad 21 01 39.1 -28 02 13           ~ 3 0
93 AT20G J210143-174758 QSO 21 01 43.3266 -17 47 59.267   18       ~ 16 1
94 PKS 2100-280 rG 21 03 36.188 -27 49 21.61           ~ 11 1
95 PMN J2107-1812 Rad 21 07 25.460 -18 12 52.92           ~ 5 1
96 PMN J2107-2526 Rad 21 07 27 -25 22.0           ~ 5 0
97 PKS 2107-34 Rad 21 10 50.756 -33 51 11.02           ~ 11 1
98 PKS 2110-352 Rad 21 14 03.304 -35 02 29.49           ~ 6 1
99 QSO B2111-259 QSO 21 14 40.1000315184 -25 41 50.878624272   18.5       ~ 35 1
100 PKS 2113-21 rG 21 16 36.0876 -20 55 43.924           ~ 29 1
101 QSO J2118-3019 QSO 21 18 10.5979449720 -30 19 11.609705064   16.96 16.47 16.2   ~ 102 1
102 [VV2000] J213101.4-203656 QSO 21 31 01.47620412 -20 36 56.1567101     20.00     ~ 38 1
103 QSO B2128-315 QSO 21 31 23.1599525016 -31 21 14.537855844     18.5     ~ 18 1
104 ICRF J213750.0-204231 Sy1 21 37 50.00785656 -20 42 31.6728477   20.400 19.4 19.286   ~ 102 1
105 PKS 2135-189 rG 21 38 04.946 -18 43 29.03     20.0     ~ 17 1
106 PMN J2139-2556 rG 21 39 24.539 -25 56 44.60           ~ 10 1
107 2MASS J21515100-1946056 Sy1 21 51 51.0358412256 -19 46 05.524731516     17.90     ~ 37 1
108 LEDA 2831082 BLL 21 52 03.7779036849 -28 28 29.299210806           ~ 32 1
109 PKS J2155-3220 Rad 21 55 05.55 -32 19 52.5           ~ 6 1
110 QSO B2154-1828 QSO 21 56 57.4085284128 -18 13 46.533365040     19.8     ~ 34 0
111 QSO B2203-188B Bla 22 06 10.4191299456 -18 35 38.685386940   18.80 19.74     ~ 177 1
112 PKS 2204-203 rG 22 07 16.024 -20 03 26.67           ~ 18 1
113 PKS J2208-3131 Rad 22 08 28.382 -31 32 00.06           ~ 4 1
114 2dFGRS TGS005Z206 Sy2 22 09 20.1637016208 -23 31 53.883877692   17.0   15.983   ~ 48 1
115 [VV2000] J221404.3-245644 QSO 22 14 04.3521576480 -24 56 44.242145196     20.00     ~ 15 1
116 2QZ J221600.0-280330 Sy1 22 15 59.9763129264 -28 03 30.218662836     18.0     ~ 31 1
117 PMN J2218-3023 Rad 22 18 11.0 -30 23 41           ~ 2 0
118 PKS 2216-28 rG 22 19 42.5657 -27 56 27.238           ~ 26 1
119 PKS J2237-1712 Rad 22 37 37.21 -17 12 43.0           ~ 9 1
120 PKS J2239-1720 rG 22 39 11.3765803152 -17 20 28.214520864   15.93 16.0 14.53   ~ 64 1
121 PKS 2243-19 Rad 22 45 50.33 -18 55 18.9           ~ 7 1
122 PMN J2246-3044 Rad 22 46 32.1 -30 44 51           ~ 2 0
123 PKS 2247-232 rG 22 50 29.65 -23 01 12.5     20.5     ~ 16 1
124 QSO B2300-189 Bla 23 03 02.9760289032 -18 41 25.823118480   18.29 17.82 16.569   ~ 142 1
125 PKS 2302-347 Rad 23 04 55.60 -34 31 30.6           ~ 9 1
126 PKS 2303-253 rG 23 06 27.14 -25 06 54.4   21.4       ~ 17 1
127 PKS J2310-2757 Rad 23 10 07.56 -27 57 49.4           ~ 13 1
128 PKS J2316-2730 rG 23 16 20.02 -27 29 55.1           ~ 10 1
129 PMN J2319-2205 rG 23 19 49.24 -22 03 53.5           ~ 14 1
130 PKS J2319-2728 rG 23 19 56.2948629696 -27 28 12.172353060   17.5       ~ 30 1
131 PKS 2318-195 rG 23 20 49.68852187 -19 19 19.8555885   19       ~ 17 1
132 PKS J2321-2410 rG 23 21 03.59 -24 10 43.6           ~ 14 1
133 PKS 2322-275 rG 23 24 47.36549 -27 19 19.5644           ~ 22 1
134 PKS 2325-213 rG 23 28 33.79 -21 06 06.7           ~ 14 1
135 PKS J2329-1923 rG 23 29 33.68 -19 23 03.6     18.5     ~ 10 1
136 LEDA 2831759 BLL 23 29 40.1888311536 -21 13 45.091043606     18.0     ~ 21 1
137 PKS J2336-3443 Rad 23 36 48.17 -34 44 08.5           ~ 9 1
138 PKS 2339-353 rG 23 41 45.85196 -35 06 22.1963           ~ 22 1
139 [VV96] J235049.8-245704 QSO 23 50 49.8289226904 -24 57 03.826750788     18     ~ 25 1
140 MCG-06-01-008 QSO 23 57 00.7406438328 -34 45 32.994968292   13.89 13.26 12.19   ~ 131 2

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