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- Ames Research CenterUS864 papers
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12 papers · 2 filters
The 15-20 um emission in the reflection nebula NGC2023
Els Peeters, Alexander G. G. M. Tielens, Louis J. Allamandola +1
We present 15-20 um spectral maps towards the reflection nebula NGC2023 obtained with the Infrared Spectrograph in short-wavelength, high-resolution mode on board the Spitzer Space…
The PAH hypothesis after 25 years
Els Peeters
The infrared spectra of many galactic and extragalactic objects are dominated by emission features at 3.3, 6.2, 7.7, 8.6 and 11.2 μm. The carriers of these features remained a myst…
Fullerenes in circumstellar and interstellar environments
Jan Cami, Jeronimo Bernard-Salas, Els Peeters +1
We recently identified several emission bands in the Spitzer-IRS spectrum of the unusual planetary nebula Tc 1 with the infrared active vibrational modes of the neutral fullerene s…
PDR Model Mapping of Physical Conditions via Spitzer/IRS Spectroscopy of H2: Theoretical Success toward NGC 2023-South
Y. Sheffer, M. G. Wolfire, D. J. Hollenbach +2
We use the IRS on Spitzer to observe the southern part of the reflection nebula NGC 2023, including the Southern Ridge, which is a photodissociation region par excellence excited b…
A Spitzer Space Telescope survey of massive young stellar objects in the G333.2-0.4 giant molecular cloud
Janet P. Simpson, Angela S. Cotera, Michael G. Burton +3
The G333 giant molecular cloud contains a few star clusters and H II regions, plus a number of condensations currently forming stars. We have mapped 13 of these sources with the ap…
Herschel Measurements of Molecular Oxygen in Orion
Paul F. Goldsmith, Rene Liseau, Tom A. Bell +31
We report observations of three rotational transitions of molecular oxygen (O2) in emission from the H2 Peak 1 position of vibrationally excited molecular hydrogen in Orion. We obs…