The structure of the interstellar medium at the 25 AU scale

Details The structure of the interstellar medium at the 25 AU scale The structure of the interstellar medium at the 25 AU scale

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..302d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 302-306.

Astronomy and Astrophysics

Astrophysics

109

Absorption Spectra, Extragalactic Radio Sources, Interstellar Matter, Very Long Base Interferometry, Astronomical Spectroscopy, H Lines, Optical Thickness

Scientific paper

A three-station VLBI Galactic H I absorption experiment has been carried out with baselines up to 600 km. The large collecting area of the European VLBI Network consisting of the Lovell Telescope (Mark Ia), the 100 m telescope at Effelsberg, and the Westerbork Synthesis Radio Telescope was necessary to achieve adequate sensitivity for these high angular resolution (0.05 arcsec) and high-velocity resolution (0.5 km/s) observations. The extragalactic sources 3C 138, 3C 147, and 3C 380 were observed. Changes in the local H I apparent absorption were observed in all three sources as a function of resolution. The changes are most striking in the direction of 3C 138. The implied linear diameters are in the range 25 AU with typical H I densities of 10,000-100,000/cu cm.

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