Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...72..755b&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 72, April 1990, p. 755-760.
Astronomy and Astrophysics
Astronomy
27
Andromeda Galaxy, H Lines, Interstellar Matter, Sky Surveys (Astronomy), Astronomical Spectroscopy, Brightness Temperature, Emission Spectra, Interstellar Gas, Very Large Array (Vla), Galaxies: Individual (M31), Galaxies: Interstellar Matter, Radio Sources: 21 Cm Radiation
Scientific paper
Initial results, in the form of images at fixed velocity and an integral of neutral hydrogen emission, are presented for the northeast half of M31. The resolution is about 10" spatially and 5 km s-1 in velocity. A uniform rms sensitivity per velocity channel of 6.6 K was obtained over an area of about 30' × 75' by observing at 10 closely spaced pointings in the B-, C-, and D-configurations of the Very Large Array. Some dramatic results include the widespread detection of high brightness temperature (140-180 K) Hi structures, which are apparently resolved spatially (˜100 pc) but only marginally in velocity. Significant optical depths are likely to be present along many lines of sight.
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