An expanding Hıı photodissociated region associated with the compact Hııı region G213.880-11.837 in the GGD 14 complex

Abstract

We present high angular and spectral resolution Hi 21 cm line observations toward the cometary-shaped compact Hii region G213.880−11.837 in the GGD 14 complex. The kinematics and morphology of the photodissociated region, traced by the Hi line emission, reveal that the neutral gas is part of an expanding flow. The kinematics of the Hi gas along the major axis of G213.880−11.837 shows that the emission is very extended toward the SE direction, reaching local standard of rest (LSR) radial velocities in the tail of about 14 km s−1. The ambient LSR radial velocity of the molecular gas is 11.5 km s−1, which suggests a champagne flow of the Hi gas. This is the second (after G111.61+0.37) cometary Hii/Hi region known.