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 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...
متن کاملSpace - VLBI observations of OH masers
We report on the first space-VLBI observations of the OH masers in two main-line OH transitions at 1665 and 1667 MHz. The observations involved the space radio telescope on board the Japanese satellite HALCA and an array of ground radio telescopes. The maps of the maser region and images of individual maser spots were produced with an angular resolution of 1 mas, which is several times higher t...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1997
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/287.2.253