The H Ⅱ Region Sharpless 269. I. Morphological Study of the Radial Velocity, Velocity Dispersion, and Density Fields

摘要

We present [S II] λλ6716.5, 6730.8 radial velocity, velocity dispersion, and density field maps of the H II region Sharpless 269 obtained using a scanning Fabry-Perot interferometer. The radial velocity field shows a clear bipolar morphology probably related to the dust/molecular lane bisecting the H II region. The mean LSR velocity (V_LsR) extracted from the data is 16.45 + - 0.03 km s~-1 (1 σ= 2.77 + - 0.02 km s~-1), blueshifted by 1.3 km s~-1 from the associated molecular cloud. The mean velocity dispersion given by subtraction of the instrumental and thermal Doppler broadenings from the FWHM of the line profiles is 16.43 + - 0.10 km s~-1 (1 σ= 10.40 + - 0.07 km s~-1).