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The c2d Spitzer Spectroscopic Survey of Ices around Low-Mass Young Stellar Objects. I. H₂O and the 5-8 µm Bands

Augereau, J. -C.; Stapelfeldt, K. R.; van Dishoeck, E. F. +23 more

To study the physical and chemical evolution of ices in solar-mass systems, a spectral survey is conducted of a sample of 41 low-luminosity YSOs (L ~ 0.1-10 L_⊙) using 3-38 µm Spitzer and ground-based spectra. The sample is complemented with previously published Spitzer spectra of background stars and with ISO spectra of well-studi…

Variations of the Mid-IR Aromatic Features inside and among Galaxies

Madden, Suzanne C.; Jones, Anthony P.; Galliano, Frédéric +2 more

We present the results of a systematic study of mid-IR spectra of Galactic regions, Magellanic H II regions, and galaxies of various types (dwarf, spiral, starburst), observed by the satellites ISO and Spitzer. We study the relative variations of the 6.2, 7.7, 8.6, and 11.3 µm features inside spatially resolved objects (such as M82, M51, 30 …

High-Ionization Mid-Infrared Lines as Black Hole Mass and Bolometric Luminosity Indicators in Active Galactic Nuclei

Lutz, D.; Sturm, E.; Helou, G. +6 more

We present relations of the black hole mass and the optical luminosity with the velocity dispersion and the luminosity of the [Ne V] and the [O IV] high-ionization lines in the mid-infrared (MIR) for 28 reverberation-mapped active galactic nuclei. We used high-resolution Spitzer Infrared Spectrograph and Infrared Space Observatory Short Wavelength…

SWAS Observations of Water in Molecular Outflows

Bergin, Edwin A.; Neufeld, David A.; Kaufman, Michael J. +4 more

We present detections of the ground-state 1₁₀→ 1₀₁ transition of ortho-H₂O at 557 GHz in 18 molecular outflows based on data from the Submillimeter Wave Astronomy Satellite (SWAS). These results are combined with ground-based observations of the J = 1-0 transitions of ¹²CO and ¹³CO obtained at…

High-excitation OH and H₂O Lines in Markarian 231: The Molecular Signatures of Compact Far-infrared Continuum Sources

Smith, Howard A.; Ashby, Matthew L. N.; González-Alfonso, Eduardo +3 more

The ISO LWS far-infrared spectrum of the ultraluminous galaxy Mrk 231 shows OH and H₂O lines in absorption from energy levels up to 300 K above the ground state, and emission in the [O I] 63 µm and [C II] 158 µm lines. Our analysis shows that OH and H₂O are radiatively pumped by the far-infrared continuum emission…

A Survey of 3.3 µm PAH Emission in Planetary Nebulae

McLean, Ian S.; Smith, Erin C. D.

Results are presented from a pilot survey of 3.3 µm PAH emission from planetary nebulae using FLITECAM, an instrument intended for airborne astronomy with SOFIA. The observations were made during ground-based commissioning of FLITECAM's spectroscopic mode at the 3 m Shane Telescope at Lick Observatory. Direct-ruled KRS-5 grisms were used to …