Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..551b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 551-555. Research supported by CNRS.
Astronomy and Astrophysics
Astrophysics
21
H Ii Regions, Hydroxyl Emission, Masers, Very Long Base Interferometry, Astronomical Maps, Brightness Temperature, Power Spectra
Scientific paper
VLBI observations of the (Pi - 2)1/2, J = 1/2, F = 1-0 excited-OH emission at 4765.562 MHz in compact H II regions were made. Maps of the three main groups of features observed in W3(OH) show, at two different epochs, similar overall spatial structure: same relative positions, and same total extent of emission. Transatlantic fringes were detected for the first time, thus demonstrating the presence of spot sizes of order one to a few milliarcsec consistent with minimum brightness temperatures. Extending the work made in W3(OH) to other sources is extremely sensitivity-limited. In ON1 the detection of fringes between Effelsberg and Westerbork are reported. The results imply a brightness temperature of order of or larger than 10 to the 7th K. Excitation and physical conditions for the 4765 masers in W3(OH) are briefly outlined.
Baudry Alain
Diamond Phil J.
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