منابع مشابه
VLA observations of 6-cm excited OH
The VLA was used to determine precise positions for 4765-MHz OH maser emission sources toward star-forming regions which had been observed about seven months earlier with the Effelsberg 100-meter telescope. The observations were successful for K3-50, DR21EX, W75N, and W49A. No line was detected toward S255: this line had decreased to less than 5 per cent of the flux density observed only seven ...
متن کاملA MERLIN Study of 6 GHz Excited - state OH & 6 . 7 GHz Methanol Masers in ON 1
MERLIN observations of 6.668-GHz methanol and both 6.031and 6.035-GHz hydroxyl (OH) emission from the massive star-formation region ON1 are presented. These are the first methanol observations made in full polarization using 5 antennas of MERLIN, giving high resolution and sensitivity to extended emission. Maser features are found to lie at the southern edge of the ultra-compact HII region, fol...
متن کاملVLBI observations of 6 GHz OH masers in three ultra-compact H ii regions
Following our successful analysis of VLBI observations of the 2Π 3 2 , J = 2 , F = 3− 3 and F = 2− 2 excited OH emission at 6035 and 6031 MHz in W3(OH), we have analyzed the same transitions in three other ultra-compact HII regions, M17, ON1, and W51. The restoring beams were in the range 6 to 30 milliarc sec. The F = 3−3 and 2−2 hyperfine transitions of OH were both mapped in ON1. Seven 6035 M...
متن کاملVLBI maps and properties of the 6 GHz OH masers in W 3(OH)
We present the first maps of the 2Π 3 2 , J = 2 , F = 3−3 and F = 2−2OH maser emission from W3(OH) at 6.035 and 6.031 GHz in both right and left circular polarizations. We used three antennas of the European VLBI Network to achieve a spatial resolution of a few milliarcseconds (mas). Our maps, restored with a beam of 5 x 6.5 mas, show complex OH emission structures in several velocity channels....
متن کاملOh Masers in G11.904−0.141
The massive star-forming region G11.904−0.141 is one of only 11 sources to show maser emission in the highly-excited 13441 MHz transition of OH. but the 13441 MHz masers are not detected. Consistent magnetic field strengths of approximately +3.5 mG are detected in the ground-state masers, in contrast with a possible −3.0 mG magnetic field previously detected at 13441 MHz. The variable 13441 MHz...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2003
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2003.06096.x