2000ApJ...537..875B

Query : 2000ApJ...537..875B

2000ApJ...537..875B - Astrophys. J., 537, 875-890 (2000/July-2)

OH Zeeman magnetic field detections toward five supernova remnants using the VLA.

BROGAN C.L., FRAIL D.A., GOSS W.M. and TROLAND T.H.

Abstract (from CDS):

We have observed the OH (1720 MHz) line in five galactic SNRs with the VLA to measure their magnetic field strengths using the Zeeman effect. We detected all 12 of the bright (Sν>200 mJy) OH (1720 MHz) masers previously detected by Frail et al. and Green et al. and measured significant magnetic fields (i.e., >3 σ) in 10 of them. Assuming that the ``thermal'' Zeeman equation can be used to estimate {mid}B{mid} for OH masers, our estimated fields range from 0.2 to 2 mG. These magnetic field strengths are consistent with the hypothesis that ambient molecular cloud magnetic fields are compressed via the SNR shock to the observed values. Magnetic fields of this magnitude exert a considerable influence on the properties of the cloud with the magnetic pressures (10–7-10–9 ergs.cm–3) exceeding the pressure in the ISM or even the thermal pressure of the hot gas interior to the remnant. This study brings the number of galactic SNRs with OH (1720 MHz) Zeeman detections to 10.

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Journal keyword(s): ISM: Clouds - ISM: individual (W51, G349.7+0.2, CTB 37A, CTB 33, G357.7-0.1) - ISM: Magnetic Fields - Masers - Polarization - Radio Lines: ISM

Nomenclature: Table 2: [BFG2000] W51C N (Nos 1-2), [BFG2000] G349.7+0.2 N (Nos 1-3), [BFG2000] CTB 37A N (Nos 1-5), [BFG2000] CTB 33 N (No. 1), [BFG2000] G357.7-0.1 N (No. 1).

Simbad objects: 33

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Number of rows : 33
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 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
3 SNR G337.0-00.1 SNR 16 35 06.9 -47 47 25           ~ 140 1
4 [FGR96] 163206.4-472948 Mas 16 35 48.1 -47 35 56           ~ 2 0
5 GRB 980618A gB 16 35 52 -47 35.2           ~ 270 0
6 GAL 336.9-00.2 HII 16 36 -47.7           ~ 2 0
7 SNR G346.6-00.2 SNR 17 10.3 -40 11           ~ 99 0
8 [FGR96] 171051.7-382855 Mas 17 14 17.5 -38 32 21           ~ 3 0
9 [FGR96] 171056.7-382856 Mas 17 14 22.5 -38 32 22           ~ 3 0
10 OH 348.391+00.083 Mas 17 14 25.320 -38 34 45.19           ~ 4 0
11 SNR G348.5+00.1 SNR 17 14 31.780 -38 28 34.50           ~ 233 3
12 [FGR96] 171109.1-382551 Mas 17 14 34.8 -38 29 16           ~ 3 0
13 SNR G348.5-00.0 Rad 17 15 26 -38 28.0           ~ 39 1
14 OH 349.731+00.172 Mas 17 18 00.062 -37 26 11.13           ~ 3 0
15 OH 349.734+00.172 Mas 17 18 00.896 -37 26 02.08           ~ 3 0
16 OH 349.730+00.167 Mas 17 18 01.450 -37 26 24.42           ~ 3 0
17 SNR G349.7+00.2 SNR 17 18 10.160 -37 18 53.80           ~ 196 0
18 NAME Tornado Nebula SNR 17 40 16.360 -30 58 18.87           ~ 148 0
19 NAME Sgr A East SNR 17 45 41 -29 00.8           ~ 523 2
20 SNR G359.0-00.9 Rad 17 46 50 -30 16.0           ~ 54 1
21 SNR G006.4-00.1 SNR 18 00 31.2011719 -23 25 48.001099           ~ 782 1
22 SNR G032.8-00.1 SNR 18 51 46.9 -00 03 19           ~ 110 2
23 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 1034 2
24 GBS 1900+14 gB 19 07 13 +09 19.6           ~ 906 0
25 [GFG97] 192035.89+140954.1 Mas 19 22 53.76 +14 15 44.1           ~ 3 0
26 [GFG97] 192036.43+140950.7 Mas 19 22 54.30 +14 15 40.7           ~ 3 0
27 [WMG70] 049.2-00.3 HII 19 23 01 +14 16.9           ~ 4 0
28 SNR G049.1-00.1 SNR 19 23 19.300 +14 09 21.00           ~ 309 0
29 W 51a HII 19 23 29.3 +14 31 38           ~ 186 0
30 W 51b SFR 19 23 32.8 +14 29 56           ~ 89 0
31 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
32 SNR G068.8+02.6 SNR 19 52 55 +32 54.2           ~ 361 1
33 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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