Search Publications
What Powers Ultraluminous IRAS Galaxies?
Lutz, D.; Genzel, R.; Sturm, E. +9 more
We present an ISO SWS and ISOPHOT-S, mid-infrared spectroscopic survey of 15 ultraluminous IRAS galaxies (LIR >= 1012 L⊙). We combine the survey results with a detailed case study, based on arcsecond resolution, near-IR, and millimeter imaging spectroscopy, of one of the sample galaxies (UGC 5101). We compare th…
The Nature and Evolution of Ultraluminous Infrared Galaxies:A Mid-Infrared Spectroscopic Survey
Lutz, D.; Genzel, R.; Rigopoulou, D. +2 more
We report the first results of a low-resolution mid-infrared spectroscopic survey of an unbiased, far-infrared-selected sample of 60 ultraluminous infrared galaxies (ULIRGs) (LIR>1012 Lsolar) using ISOPHOT-S on board the Infrared Space Observatory (ISO). We use the ratio of the 7.7 µm ``polycyclic aromatic…
Infrared Space Observatory Measurements of a [C II] 158 Micron Line Deficit in Ultraluminous Infrared Galaxies
Wolfire, M. G.; Lord, S. D.; Stacey, G. J. +6 more
We report measurements of the [C II] 157.74 µm fine-structure line in a sample of seven ultraluminous infrared galaxies (ULIGs) (LIR>1012 Lsolar) with the Long Wavelength Spectrometer on the Infrared Space Observatory. The [C II] line is an important coolant in galaxies and arises in interstellar gas expos…
Detection of Abundant CO2 Ice in the Quiescent Dark Cloud Medium toward Elias 16
de Graauw, Th.; Prusti, T.; van Dishoeck, E. F. +9 more
We report the first detection of solid carbon dioxide (CO2) in quiescent regions of a dark cloud in the solar neighborhood, a result that has important implications for models of ice formation and evolution in the interstellar medium. The K-type field star Elias 16 was previously known to display solid-state absorption features of H
Thermal Water Vapor Emission from Shocked Regions in Orion
Neufeld, David A.; Kaufman, Michael J.; Melnick, Gary J. +1 more
Using the Long Wavelength Spectrometer on board the Infrared Space Observatory, we have observed thermal water vapor emission from a roughly circular field of view approximately 75" in diameter centered on the Orion BN-KL region. The Fabry-Perot line strengths, line widths, and spectral line shifts observed in eight transitions between 71 and 125 …
IRAS 23385+6053: A Prototype Massive Class 0 Object
Testi, Leonardo; Molinari, Sergio; Brand, Jan +2 more
IRAS 23385+6053 is a young stellar object with a luminosity of ~1.6×104 Lsolar at a kinematic distance of 4.9 kpc. This candidate precursor of an ultracompact H II region is associated with a millimeter source detected at the James Clerk Maxwell Telescope but is undetected at centimeter wavelengths with the VLA. We observed t…
Dust Emission and Molecular Depletion in L1498
Langer, W. D.; Velusamy, T.; Willacy, K.
We present 100 and 200 µm ISOPHOT observations of the dense core L1498. We have mapped the central core by using ΔI200=I200-I100/Θ, where ΔI200 is a measure of the emission from the cold dust and Θ=I100/I200 in the outer regions. The dust continuum emission provides informatio…
Emission Features and Source Counts of Galaxies in the Mid-Infrared
Xu, Cong; Ashby, Matthew L. N.; Shupe, David L. +6 more
In this work we incorporate the newest Infrared Space Observatory (ISO) results on the mid-infrared spectral energy distributions (MIR SEDs) of galaxies into models for the number counts and redshift distributions of MIR surveys. A three-component model, with empirically determined MIR SED templates of (1) a cirrus/photodissociation region compone…
On the Far-Infrared Emission of Quasars
Haas, Martin; Meisenheimer, Klaus; Chini, Rolf +4 more
Infrared spectral energy distributions between 4.8 and 200 µm are presented for a subsample of 10 quasars and radio galaxies from the European Central Quasar Programme observed with the Infrared Space Observatory. For three of the sources, this represents the first far-infrared detection. The spectral energy distributions (SEDs) reveal signa…
Do the Infrared Emission Features Need Ultraviolet Excitation?
Werner, M.; Sellgren, K.; Uchida, K. I.
We present the results of imaging spectroscopy of the reflection nebula vdB 133, obtained with the infrared camera and circular variable filter wheel on the Infrared Space Observatory. Our observations reveal the infrared emission features (IEFs), at 6.2, 7.7, 8.7, 11.3, and 12.7 µm, and associated 5-15 µm continuum emission. The stell…