Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....62...65b&link_type=abstract
Astronomy and Astrophysics, vol. 62, no. 1-2, Jan. 1978, p. 65-68.
Astronomy and Astrophysics
Astrophysics
Gas Dynamics, Hydrogen Atoms, Interstellar Matter, Astronomical Models, Gas Density, High Resolution, Interstellar Radiation, Velocity Distribution
Scientific paper
A previously identified kinematic disturbance (designated Tau HL-1) in the local neutral hydrogen gas has been reobserved at a wavelength of 21 cm using the Arecibo 1000-ft telescope with a FWHM beamwidth of 3.2 arcmin. A position-velocity contour map of 21-cm emission is presented which demonstrates that Tau HL-1 is a velocity bridge that connects the main gas with a small cloud across a span of 10 km/s. The bridge is found to be characterized by a broad non-Gaussian emission line, a high gas density, and a short kinematic time scale (about 40,000 yr). The morphology of the observed emission and relations between the elements of the structure are discussed. It is shown that the kinematic disturbance contains a small intermediate-velocity cloud connected to the normal emission by a velocity bridge and also exhibits an extended halo of anomalous emission. The nature of this kinematic disturbance is considered.
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