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5 papers
Polycyclic aromatic hydrocarbon ionization as a tracer of gas flows through protoplanetary disk gaps
K. M. Maaskant, M. Min, L. B. F. M. Waters +1
Planet-forming disks of gas and dust around young stars contain polycyclic aromatic hydrocarbons (PAHs). We aim to characterize how the charge state of PAHs can be used as a probe…
Excitation of the molecular gas in the nuclear region of M82
A. F. Loenen, P. P. van der Werf, R. Güsten +23
We present high resolution HIFI spectroscopy of the nucleus of the archetypical starburst galaxy M82. Six 12CO lines, 2 13CO lines and 4 fine-structure lines are detected. Besides…
The Detection of Crystalline Silicates in Ultra-Luminous Infrared Galaxies
H. W. W. Spoon, A. G. G. M. Tielens, L. Armus +6
Silicates are an important component of interstellar dust and the structure of these grains -- amorphous versus crystalline -- is sensitive to the local physical conditions. We hav…
The Neutral Atomic Phases of the ISM in the Galaxy
M. G. Wolfire, C. F. McKee, D. Hollenbach +1
Much of the interstellar medium in disk galaxies is in the form of neutral atomic hydrogen, H I. This gas can be in thermal equilibrium at relatively low temperatures, T < 300 K (t…
High Resolution 4.7 um Keck/NIRSPEC Spectra of Protostars. II: Detection of the 13CO Isotope in Icy Grain Mantles
A. C. A. Boogert, G. A. Blake, A. G. G. M. Tielens
The high resolution (R=25,000) infrared M band spectrum of the massive protostar NGC 7538 : IRS9 shows a narrow absorption feature at 4.779 um (2092.3 cm-1) which we attribute to t…