2003ApJ...583..272H

Query : 2003ApJ...583..272H

2003ApJ...583..272H - Astrophys. J., 583, 272-279 (2003/January-3)

The sizes of OH (1720 MHz) supernova remnant masers: MERLIN and very long baseline array observations of IC 443.

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

Abstract (from CDS):

MERLIN and Very Long Baseline Array (VLBA) observations of the 1720 MHz maser emission from the OH molecule in the supernova remnant IC 443 are presented. Based on MERLIN data with a resolution of 160 mas, the deconvolved sizes of the maser sources are in the range 90-180 mas (135-270 AU). The 12 mas resolution VLBA images show compact cores with sizes in the range of 15-55 mas. The maser brightness temperatures are (2-34)x106 K for the MERLIN sources and (5-19)x108 K for the VLBA cores, in agreement with theory. Unlike the Zeeman Stokes V profiles observed in other OH (1720 MHz) SNR masers, single-handed circular polarization line profiles are observed in IC 443 on all angular scales from 1000 to 10 mas resolution. For one line component, the observed line width is 0.24±0.07 km.s–1, compared to an estimated Doppler width of 0.49 km.s–1. This discrepancy in line widths can be accounted for if the maser emission arises from an elongated ellipsoidal region of masing gas.

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Journal keyword(s): ISM: Individual: Alphanumeric: IC 443 - Masers - ISM: Supernova Remnants

Nomenclature: Table 1: [CFG97b] IC443 NA (Nos 1A, 1B) added. Table 3: [CFG97b] IC443 NAN (Nos 1A1, 1A2, 1A3) added.

Simbad objects: 27

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Number of rows : 27
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 NAME Gal Anticenter reg 05 46 +28.9           ~ 1024 0
3 7C 055201.39+394824.00 Bla 05 55 30.80561419 +39 48 49.1649683     18.30 17.5   ~ 527 2
4 QSO J0557+2413 QSO 05 57 04.71357870 +24 13 55.2986106           ~ 42 1
5 IC 443G PoC 06 16 43.4 +22 32 24           ~ 35 1
6 [HDS86] IC 443G1 PoC 06 16 43.4 +22 32 34           ~ 7 0
7 [CFG97b] IC443 1B Mas 06 16 43.610 +22 32 36.89           ~ 1 0
8 [CFG97b] IC443 1A Mas 06 16 43.615 +22 32 36.72           ~ 1 0
9 [CFG97b] IC443 1A1 Mas 06 16 43.6154 +22 32 36.719           ~ 1 0
10 [CFG97b] IC443 1A2 Mas 06 16 43.6157 +22 32 36.691           ~ 1 0
11 [CFG97b] IC443 1A3 Mas 06 16 43.6167 +22 32 36.703           ~ 1 0
12 IC 443 SNR 06 17 00.0000000 +22 34 11.998901           ~ 1314 1
13 NVSS J062019+210229 Rad 06 20 19.52849260 +21 02 29.5454909           ~ 26 1
14 4C 10.20 Rad 06 32 15.302 +10 22 02.17           ~ 37 1
15 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
16 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
17 SNR G006.4-00.1 SNR 18 00 31.2011719 -23 25 48.001099           ~ 782 1
18 [CFG97b] W28 24 Mas 18 01 51.201 -23 17 42.92           ~ 3 0
19 [CFG97b] W28 30 Mas 18 01 51.610 -23 17 56.27           ~ 3 0
20 [CFG97b] W28 31 Mas 18 01 51.616 -23 17 55.98           ~ 3 0
21 SNR G031.9+00.0 SNR 18 49 16.3 -00 55 01           ~ 368 2
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 [CFG97b] W44 11 Mas 18 56 26.730 +01 29 18.20           ~ 4 0
25 SNR G049.1-00.1 SNR 19 23 19.300 +14 09 21.00           ~ 309 0
26 [WS92b] C1 PoC ~ ~           ~ 3 0
27 [WS92b] C2 PoC ~ ~           ~ 3 0

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