31 citations · 31 across the 1 of their papers we have counts for
6 papers
[Ne II] Observations of Gas Motions in Compact and Ultracompact H II Regions
Qingfeng Zhu, John H. Lacy, Daniel T. Jaffe +2
We present high spatial and spectral resolution observations of sixteen Galactic compact and ultracompact H II regions in the [Ne II] 12.8 microns fine structure line. The small th…
Mass Flows in Cometary UCHII Regions
Qing-Feng Zhu, John H. Lacy, Daniel T. Jaffe +2
High spectral and spatial resolution, mid-infrared fine structure line observations toward two ultracompact HII (UCHII) regions (G29.96 -0.02 and Mon R2) allow us to study the stru…
R=100,000 Spectroscopy of Photodissociation Regions: H2 Rotational Lines in the Orion Bar
Katelyn N. Allers, Daniel T. Jaffe, John H. Lacy +1
Ground state rotational lines of H2 are good temperature probes of moderately hot (200-1000 K) gas. The low A-values of these lines result in low critical densities while ensuring…
R=100,000 Mid-IR Spectroscopy of UCHII Regions: High Resolution is Worth it!
D. T. Jaffe, Q. Zhu, J. H. Lacy +2
Ultracompact HII regions are signposts of massive star formation and their properties provide diagnostics for the characteristics of very young O stars embedded in molecular clouds…
H2 Mid-IR Pure Rotational Emission from Young Stars: The TEXES/IRTF Survey
Matthew J. Richter, John H. Lacy, Thomas K. Greathouse +2
We describe the TEXES survey for mid-IR H2 pure rotational emission from young stars and report early successes. H2 emission is a potential tracer of warm gas in circumstellar disk…
Kinematics of Ultracompact HII Regions Revealed: High Spectral and Spatial Resolution Mapping of the 12.8 micron [NeII] Line in Monoceros R2
D. T. Jaffe, Q. Zhu, J. H. Lacy +1
We present the first results of a study of the kinematics and morphology of ultracompact HII regions using a new observational technique. We used very high spatial (1.5") and spect…