2005ApJ...620..257H

Query : 2005ApJ...620..257H

2005ApJ...620..257H - Astrophys. J., 620, 257-273 (2005/February-2)

The OH (1720 MHz) supernova remnant masers in W28: MERLIN and VLBA polarization observations.

HOFFMAN I.M., GOSS W.M., BROGAN C.L. and CLAUSSEN M.J.

Abstract (from CDS):

Full-polarization MERLIN and VLBA observations of the 1720 MHz maser emission from the OH molecule in the supernova remnant W28 are presented. Zeeman splitting (|B|~0.75 mG) has been directly resolved between right- and left-circularly polarized spectra for the first time. Linear polarization position angles and circular polarization Zeeman splitting observed in the maser emission permit interpretation of a comprehensive picture of the magnetic field at the supernova/molecular cloud interface marked by the masers. We find the post-SNR shock magnetic field to be well ordered over the ∼1 pc covered by the maser region (compared with the approximately 30 pc diameter of the entire SNR) and well aligned with the shock front that is traced by synchrotron radiation and molecular emission. Based on MERLIN data having a resolution of 200 mas and VLBA data with a resolution of 15 mas, the masers are measured to have deconvolved angular sizes of 90-350 mas (225-875 AU) with compact cores 20 mas (50 AU) in size, consistent with theoretical expectation and previous observations.

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Journal keyword(s): ISM: Individual: Alphanumeric: W28 - Masers - ISM: Supernova Remnants

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 - 2024 		#notes
1 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4017 3
2 IC 443 SNR 06 17 00.0000000 +22 34 11.998901           ~ 1237 1
3 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4351 2
4 NAME Her B Sy1 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1729 2
5 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 949 1
6 PMN J1751-2524 Rad 17 51 51.26253123 -25 24 00.0635706           ~ 85 1
7 SNR G006.4-00.1 SNR 18 00 31.2011719 -23 25 48.001099           ~ 738 1
8 [CFG97b] W28 OH A Mas 18 00 49.924 -23 20 26.66           ~ 6 0
9 [CFG97b] W28 OH B Mas 18 01 -23.3           ~ 5 0
10 [CFG97b] W28 OH E Mas 18 01 -23.3           ~ 6 0
11 [CFG97b] W28 7 Mas 18 01 15.638 -23 16 35.97           ~ 2 0
12 [CFG97b] W28 OH C Mas 18 01 44.041 -23 24 23.05           ~ 6 0
13 [CFG97b] W28 13 Mas 18 01 44.349 -23 26 21.44           ~ 2 0
14 [CFG97b] W28 OH F Mas 18 01 50.002 -23 18 46.58           ~ 8 0
15 [CFG97b] W28 14 Mas 18 01 50.567 -23 18 20.23           ~ 2 0
16 [CFG97b] W28 16 Mas 18 01 50.788 -23 18 31.61           ~ 2 0
17 [CFG97b] W28 19 Mas 18 01 51.017 -23 18 28.53           ~ 2 0
18 [CFG97b] W28 20 Mas 18 01 51.045 -23 18 32.50           ~ 2 0
19 [CFG97b] W28 21 Mas 18 01 51.062 -23 18 31.06           ~ 2 0
20 [CFG97b] W28 22 Mas 18 01 51.127 -23 17 43.40           ~ 2 0
21 [CFG97b] W28 23 Mas 18 01 51.190 -23 17 45.04           ~ 2 0
22 [CFG97b] W28 24 Mas 18 01 51.201 -23 17 42.92           ~ 3 0
23 [CFG97b] W28 26 Mas 18 01 51.242 -23 17 52.11           ~ 2 0
24 [CFG97b] W28 27 Mas 18 01 51.270 -23 17 46.99           ~ 2 0
25 [CFG97b] W28 30 Mas 18 01 51.610 -23 17 56.27           ~ 3 0
26 [CFG97b] W28 31 Mas 18 01 51.616 -23 17 55.98           ~ 3 0
27 [CFG97b] W28 34 Mas 18 01 51.730 -23 18 06.64           ~ 2 0
28 [CFG97b] W28 33 Mas 18 01 51.731 -23 18 08.09           ~ 2 0
29 [CFG97b] W28 35 Mas 18 01 51.917 -23 17 10.67           ~ 2 0
30 [CFG97b] W28 36 Mas 18 01 52.017 -23 17 08.76           ~ 2 0
31 [CFG97b] W28 40 Mas 18 01 52.671 -23 19 15.44           ~ 2 0
32 OH 006.687-00.297 Mas 18 01 52.707 -23 19 23.90           ~ 4 0
33 [CFG97b] W28 41 Mas 18 01 52.787 -23 19 18.64           ~ 2 0
34 [CFG97b] W28 OH D Mas 18 11 41.444 -23 25 05.26           ~ 6 0
35 3C 391.0 BL? 18 49 16.3 -00 55 01           ~ 352 2
36 4C -00.73 Rad 18 51 46.9 -00 03 19           ~ 100 1
37 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 965 2
38 W 51 SNR 19 23 50 +14 06.0           ~ 1278 1

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