Search Publications
Interpreting the Cosmic Infrared Background: Constraints on the Evolution of the Dust-enshrouded Star Formation Rate
Elbaz, D.; Chary, R.
The mid-infrared local luminosity function is evolved with redshift to fit the spectrum of the cosmic infrared background (CIRB) at λ>5 µm and the galaxy counts from various surveys at mid-infrared, far-infrared, and submillimeter wavelengths. A variety of evolutionary models provide satisfactory fits to the CIRB and the number counts. Th…
Infrared Space Observatory's Discovery of C4H2, C6H2, and Benzene in CRL 618
Waters, L. B. F. M.; Cernicharo, José; Tielens, A. G. G. M. +4 more
We report on the detection with the Infrared Space Observatory (ISO), for the first time in the circumstellar medium, of the polyacetylenic chains C4H2 and C6H2 and of benzene (C6H6) in the direction of the proto-planetary nebula CRL 618. Surprisingly, the abundances of di- and tria…
The Infrared Spectral Energy Distribution of Normal Star-forming Galaxies
Dale, Daniel A.; Helou, George; Silbermann, Nancy A. +2 more
We present a new phenomenological model for the spectral energy distribution of normal star-forming galaxies between 3 and 1100 µm. A sequence of realistic galaxy spectra are constructed from a family of dust emission curves assuming a power-law distribution of dust mass over a wide range of interstellar radiation fields. For each interstell…
Far-Infrared Spectroscopy of Normal Galaxies: Physical Conditions in the Interstellar Medium
Helou, G.; Contursi, A.; Stacey, G. +10 more
The most important cooling lines of the neutral interstellar medium (ISM) lie in the far-infrared (FIR). We present measurements by the Infrared Space Observatory Long Wavelength Spectrometer of seven lines from neutral and ionized ISM of 60 normal, star-forming galaxies. The galaxy sample spans a range in properties such as morphology, FIR colors…
Isocam-Cvf 5-12 Micron Spectroscopy of Ultraluminous Infrared Galaxies
Lutz, D.; Genzel, R.; Sturm, E. +10 more
We present low-resolution mid-infrared (MIR) spectra of 16 ultraluminous infrared galaxies (ULIRGs) obtained with the circular variable filter (CVF) spectroscopy mode of ISOCAM on board the Infrared Space Observatory (ISO). Our sample completes previous ISO spectroscopy of ultra- and hyperluminous infrared galaxies toward higher luminosities. The …
H2 and CO Emission from Disks around T Tauri and Herbig Ae Pre-Main-Sequence Stars and from Debris Disks around Young Stars: Warm and Cold Circumstellar Gas
Thi, W. F.; Natta, A.; van Dishoeck, E. F. +8 more
We present ISO Short-Wavelength Spectrometer observations of H2 pure-rotational line emission from the disks around low- and intermediate-mass pre-main-sequence stars as well as from young stars thought to be surrounded by debris disks. The pre-main-sequence sources have been selected to be isolated from molecular clouds and to have cir…
Dusty Debris around Solar-Type Stars: Temporal Disk Evolution
Zuckerman, B.; Silverstone, M. D.; Becklin, E. E. +2 more
Using ISO-ISOPHOT, we carried out a survey of almost 150 stars to search for evidence of emission from dust orbiting young main-sequence stars, both in clusters and isolated systems. Over half of the detections are new examples of dusty stellar systems and demonstrate that such dust can be detected around numerous stars older than a few times 10
Near-Infrared Integral Field Spectroscopy and Mid-Infrared Spectroscopy of the Starburst Galaxy M82
Lutz, D.; Förster Schreiber, N. M.; Genzel, R. +2 more
We present new infrared observations of the central regions of the starburst galaxy M82. The observations consist of near-infrared integral field spectroscopy in the H and K bands obtained with the MPE 3D instrument and of λ=2.4-45 µm spectroscopy from the Short Wavelength Spectrometer (SWS) onboard the Infrared Space Observatory. These meas…
Far-Infrared Investigation of Class 0 Sources: Line Cooling
Giannini, Teresa; Nisini, Brunella; Lorenzetti, Dario
We have investigated with the Long Wavelength Spectrometer (LWS) of the Infrared Space Observatory (ISO) the far-infrared spectra (43-197 µm) of a sample of 17 class 0 sources and their associated outflows. In addition to [O I] 63 µm, the pure rotational lines of abundant molecules such as CO, H2O, and OH are frequently obse…
On the Origin of Infrared Plateau Features in Proto-Planetary Nebulae
Volk, Kevin; Kwok, Sun; Bernath, Peter
The emission profiles of the 8 and 12 µm plateau features are derived from the Infrared Space Observatory spectra of proto-planetary nebulae. We suggest that these plateau features are primarily the result of alkane and alkene side groups on very large aromatic molecules and small carbonaceous particles. The relationship between the narrow a…