VLA recombination line observations of the cometary H II region G34.3+0.2: Dynamics and physical properties

Abstract

view Abstract Citations (63) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS VLA Recombination Line Observations of the Cometary H II Region G34.3+0.2: Dynamics and Physical Properties Gaume, Ralph A. ; Fey, Alan L. ; Claussen, Mark J. Abstract We have observed the H93(alpha) radio recombination line emission toward the cometary H II region G34.3+0.2 component C. A velocity gradient with a total extent of approximately equal 35 km/s is found in the H93(alpha) line emission perpendicular to the symmetry axis of the cometary H II region. A smaller velocity gradient is found parallel to the symmetry axis. The moving star bow shock model and the champagne outflow model have been suggested to explain observations of G34.3+0.2C. Neither model adequately matches the available velocity data. G34.3+0.2 components A and B are found near G34.3+0.2C. The continuum spectral indices of components A and B are consistent with that expected for an ionized wind outflow. We suggest a qualitative model for the region where the ionizing star of the cometary H II region G34.3+0.2C photo-evaporates material from a hot ultracompact molecular core found just to the east of the continuum emission. Interaction between the ionized gas of the cometary H II region and winds from components A and B may explain many of the current observations. We have also mapped the 616 goes to 523 transition of H2O toward G34.3+0.2. We find strong H2O maser emission within a approximately equals 50 sec x 30 sec region. Some of the H2O masers are projected onto sources of radio continuum emission, but others are found well separated from radio continuum emission. Publication: The Astrophysical Journal Pub Date: September 1994 DOI: 10.1086/174603 Bibcode: 1994ApJ...432..648G Keywords: Astronomical Models; Bow Waves; Emission Spectra; H Alpha Line; H Ii Regions; Shock Waves; Stellar Winds; Velocity Distribution; Interstellar Masers; Ionized Gases; Molecular Clouds; Radio Emission; Star Formation; Very Large Array (Vla); Astrophysics; ISM: H II REGIONS; ISM: INDIVIDUAL ALPHANUMERIC: G34.3; 0.2; ISM: KINEMATICS AND DYNAMICS; RADIO LINES: ISM; STARS: FORMATION full text sources ADS | data products SIMBAD (6)