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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…
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…
Spitzer Spectroscopy of the Transition Object TW Hya
Joan R. Najita, John S. Carr, Stephen E. Strom +5
We report sensitive Spitzer IRS spectroscopy in the 10-20 micron region of TW Hya, a nearby T Tauri star. The unusual spectral energy distribution of the source, that of a transiti…