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The Submillimeter Frontier: A Space Science Imperative
John C. Mather, S. Harvey Moseley, David Leisawitz +8
A major goal of modern astrophysics is to understand the processes by which the universe evolved from its initial simplicity, as seen in measurements of the Cosmic Microwave Backgr…
The Ratio of Ortho- to Para-H2 in Photodissociation Regions
Amiel Sternberg, David A. Neufeld
We discuss the ratio of ortho- to para-H2 in photodissociation regions (PDRs). We draw attention to an apparent confusion in the literature between the ortho-to-para ratio of molec…
Formation of Interstellar Ices Behind shock Waves
Edwin A. Bergin, David A. Neufeld, Gary J. Melnick
We have used a coupled dynamical and chemical model to examine the chemical changes induced by the passage of an interstellar shock in well shielded regions. Using this model we de…
ISO observations of molecular hydrogen in HH 54: measurement of a non-equilibrium ortho- to para-H2 ratio
David A. Neufeld, Gary J. Melnick, Martin Harwit
We have detected the S(1), S(2), S(3), S(4) and S(5) pure rotational lines of molecular hydrogen toward the outflow source HH 54, using the Short Wavelength Spectrometer (SWS) on b…
The Post-Shock Chemical Lifetimes of Outflow Tracers and a Possible New Mechanism to Produce Water Ice Mantles
Edwin A. Bergin, Gary J. Melnick, David A. Neufeld
We have used a coupled time-dependent chemical and dynamical model to investigate the lifetime of the chemical legacy left in the wake of C-type shocks. We concentrate this study o…
Search for Interstellar Water in the Translucent Molecular Cloud toward HD 154368
Marco Spaans, David Neufeld, Stephen Lepp +2
We report an upper limit of 9 x 10^{12} cm-2 on the column density of water in the translucent cloud along the line of sight toward HD 154368. This result is based upon a search fo…
Thermal Water Vapor Emission from Shocked Regions in Orion
Martin Harwit, David A. Neufeld, Gary J. Melnick +1
Using the Long Wavelength Spectrometer (LWS) onboard the Infrared Space Observatory (ISO), we have observed thermal water vapor emission from a roughly circular field of view appro…