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Resolution of Distance Ambiguities of Inner Galaxy Massive Star Formation Regions II
M. Sewilo, C. Watson, E. Araya +3
We report simultaneous H110alpha and H2CO line observations with the NRAO Green Bank Telescope toward 72 H II regions in the SPITZER/GLIMPSE survey area (|l| = 10 deg - 65 deg and…
A GLIMPSE of Star Formation in the Giant H II Region RCW 49
B. A. Whitney, R. Indebetouw, B. L. Babler +19
GLIMPSE imaging using the Infrared Array Camera (IRAC) on the Spitzer Space Telescope indicates that star formation is ongoing in the RCW 49 giant H II region. A photometric compar…
The Wavelength Dependence of Interstellar Extinction from 1.25 to 8.0 microns Using GLIMPSE Data
R. Indebetouw, J. S. Mathis, B. L. Babler +17
We determine and tabulate A(lambda)/A(K), the wavelength dependence of interstellar extinction, in the Galactic plane for 1.25um<lambda<8.0um along two lines of sight: l~42 and l~2…
Free-Free Spectral Energy Distributions of Hierarchically Clumped HII Regions
Richard Ignace Edward B Churchwell
In an effort to understand unusual power-law spectral slopes observed in some hypercompact HII regions, we consider the radio continuum energy distribution from an ensemble of sphe…
Kelvin-Helmholtz Instability in a Weakly Ionized Medium
C. Watson, E. G. Zweibel, F. Heitsch +1
Ambient interstellar material may become entrained in outflows from massive stars as a result of shear flow instabilities. We study the linear theory of the Kelvin - Helmholtz inst…