VLA synthesis of H I absorption toward W43 (G30.8 + 0.0)

Details VLA synthesis of H I absorption toward W43 (G30.8 + 0.0) VLA synthesis of H I absorption toward W43 (G30.8 + 0.0)

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.2349l&link_type=abstract

The Astronomical Journal (ISSN 0004-6256), vol. 106, no. 6, p. 2349-2358

Astronomy and Astrophysics

Astronomy

11

Absorption Spectra, Astronomical Models, H Ii Regions, Hydrogen, Radiation Absorption, Emission Spectra, Kinematics, Radio Astronomy, Very Large Array (Vla)

Scientific paper

We used the Very Large Array (VLA) synthesize the continuum structure of the main component of W43, a very large H II region located near the subcentral point at l = 30.8 deg, b = 0.00 deg, and we mapped the 21 cm H I absorption across it at resolution 12.5 sec and 1.29 km/s. The H I occurs in features which strikingly show the influence of spiral structure on low-latitude galactic kinematics. The observations can be understood in terms of the two-arm spiral-shock model of Roberts & Burton, with the additional requirement that the mean H I spin temperature be a strong function of spiral phase. The ansatz also has the virtue of explaining a long-standing anomaly in the overall shape of low-altitude inner-galaxy H I emission profiles, which often fail to show the strong terminal velocity ridge imposed by simple rotational kinematics in a uniform gas.

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