2005ApJ...627..803H

Query : 2005ApJ...627..803H

2005ApJ...627..803H - Astrophys. J., 627, 803-812 (2005/July-2)

The OH (1720 MHz) supernova remnant masers in W44: 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 W44 are presented. Zeeman splitting has been directly resolved between right- and left-circularly polarized spectra indicating magnetic field strengths of|B|~0.50 mG. The position angle of the linear polarization is in good agreement with the orientation of the shocked gas at the supernova remnant/molecular cloud interface. 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 50-350 mas (150-1000 AU) with compact cores 20 mas (60 AU) in size, consistent with theoretical expectation and previous observations.

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Journal keyword(s): ISM: Individual: Alphanumeric: W44 - Masers - Radio Lines: ISM - ISM: Supernova Remnants

Nomenclature: Table 2: [CFG97b] W44 NNA (Nos 8A-8B, 11A-11C, 20A, 20B) added.

Simbad objects: 23

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Number of rows : 23
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 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
2 IC 443 SNR 06 17 00.0000000 +22 34 11.998901           ~ 1314 1
3 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
4 3C 345 Bla 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1808 3
5 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 1007 1
6 SNR G006.4-00.1 SNR 18 00 31.2011719 -23 25 48.001099           ~ 782 1
7 NVSS J183848+040424 Rad 18 38 48.82901984 +04 04 24.6675000           ~ 19 1
8 [CFG97b] W44 OH A Mas 18 55 27 +01 33.7           ~ 4 0
9 [CFG97b] W44 OH B Mas 18 56 01.2 +01 12 27           ~ 4 0
10 [CFG97b] W44 7 Mas 18 56 01.283 +01 12 46.82           ~ 2 0
11 [CFG97b] W44 OH C Mas 18 56 03.7 +01 08 44           ~ 4 0
12 [CFG97b] W44 8 Mas 18 56 03.796 +01 08 46.98           ~ 2 0
13 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 1034 2
14 PSR B1853+01 Psr 18 56 10.65 +01 13 21.3           ~ 211 1
15 [CFG97b] W44 11 Mas 18 56 26.730 +01 29 18.20           ~ 4 0
16 [CFG97b] W44 OH E Mas 18 56 29.1 +01 29 44           ~ 7 0
17 [CFG97b] W44 OH D Mas 18 56 29.4 +01 20 26           ~ 5 0
18 [CFG97b] W44 18 Mas 18 56 29.477 +01 20 26.59           ~ 2 0
19 [CFG97b] W44 20 Mas 18 56 29.674 +01 29 08.21           ~ 2 0
20 [CFG97b] W44 23 Mas 18 56 36.630 +01 26 29.94           ~ 2 0
21 [CFG97b] W44 24 Mas 18 56 36.674 +01 26 37.17           ~ 3 0
22 [CFG97b] W44 OH F Mas 18 56 36.9 +01 26 35           ~ 6 0
23 ICRF J190711.9+012708 QSO 19 07 11.99616361 +01 27 08.9617282           ~ 49 1

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