Physics – Optics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344004b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #440.04; Bulletin of the American Astronomical Society, Vol. 41, p.317
Physics
Optics
Scientific paper
Gemini North adaptive optics imaging spectroscopy is presented for the Galactic UCHII region K3-50A. Data were obtained in the K-band using the Near infrared Integral Field Spectrograph (NIFS) behind the facility adaptive optics module ALTAIR in natural guide star mode. The NIFS data cube reveals a complex spatial morphology across the 0.1 pc scale of the 3'' UCHII region. Comparison of the nebular emission to Cloudy ionization models shows that the central source must have an effective temperature between about 37000 K and 45000 K with preferred values near 40000 K. Evidence is presented for sharp density variations in the nebula which are interpreted as a clearing of material nearest the central source. High excitation lines of FeIII and SeIV show that the ionization of the nebula clearly changes with distance from the central source. A kinematic flow (+/- 25 \kms) is evident in the Br gamma line map which may be related to the larger scale ionized flow detailed in earlier investigations. Though clearly resolved from the nebula, the central source itself remains buried, and the NIFS spectrum shows no evidence of photospheric lines.
Blum Robert David
McGregor Peter J.
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