Kinematics of the Ultracompact H II Region W3(OH): Constraints Derived from High-n Radio Recombination Lines

Details Kinematics of the Ultracompact H II Region W3(OH): Constraints Derived from High-n Radio Recombination Lines Kinematics of the Ultracompact H II Region W3(OH): Constraints Derived from High-n Radio Recombination Lines

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...459..632s&link_type=abstract

Astrophysical Journal v.459, p.632

Astronomy and Astrophysics

Astronomy

9

Ism: H Ii Regions, Ism: Individual Alphanumeric: W3(Oh), Ism: Kinematics And Dynamics, Radio Lines: Ism, Stars: Formation

Scientific paper

We observed the ultracompact H II region W3(OH) with 6" spatial resolution in the H66alpha, H76alpha, and H1 10alpha radio recombination lines with the goal of constraining its structure and kinematics via the line shapes. We find that the H66alpha line has a local standard of rest (LSR) center velocity of -50.7 + 0.3 km s 1 and FWHM of 36.0 + 1.8 km S 1; the H76alpha line has an LSR center velocity of - 50.3 + 0.2 km s 1 and FWHM of 40.7 + 2.1 km s 1; and the H110alpha line has an LSR center velocity of -63.1 + 3.9 km S-^{1 }and FWHM of 69.4 + 16.2 km 5-1 The H 1 10alpha line profile is significantly impact broadened and is the first detection of this phenomena in a compact or ultracompact H II region. The broadening is not as strong as simple modeling predicts, a discrepancy most likely attributable to clumpiness in the ionized gas. The line widths and velocities best support an "accelerated champagne flow" kinematic model.

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