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- Ames Research CenterUS864 papers
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7 papers · 2 filters
The 9.7 and 18 um silicate absorption profiles towards diffuse and molecular cloud lines-of-sight
J. M. van Breemen, M. Min, J. E. Chiar +8
Studying the composition of dust in the interstellar medium (ISM) is crucial in understanding the cycle of dust in our galaxy. The mid-infrared spectral signature of amorphous sili…
Distribution of Water Vapor in Molecular Clouds
Gary J. Melnick, Volker Tolls, Ronald L. Snell +5
We report the results of a large-area study of water vapor along the Orion Molecular Cloud ridge, the purpose of which was to determine the depth-dependent distribution of gas-phas…
An Initial Mass Function for Individual Stars in Galactic Disks: I. Constraining the Shape of the IMF
Antonio Parravano, Christopher F. McKee, David J. Hollenbach
We derive a semi-empirical galactic initial mass function (IMF) from observational constraints. We assume that the star formation rate in a galaxy can be expressed as the product o…
Spitzer reveals what's behind Orion's Bar
Robert H. Rubin, Janet P. Simpson, C. R. O'Dell +5
We present Spitzer Space Telescope observations of 11 regions SE of the Bright Bar in the Orion Nebula, along a radial from the exciting star theta1OriC, extending from 2.6 to 12.1…
Herschel/HIFI discovery of interstellar chloronium (HCl)
D. C. Lis, J. C. Pearson, D. A. Neufeld +102
We report the first detection of chloronium, HCl, in the interstellar medium, using the HIFI instrument aboard the \emph{Herschel} Space Observatory. The li…
The Dark Molecular Gas
Mark G. Wolfire, David Hollenbach, Christopher F. McKee
The mass of molecular gas in an interstellar cloud is often measured using line emission from low rotational levels of CO, which are sensitive to the CO mass, and then scaling to t…