Search Publications
The Dust Content and Opacity of Actively Star-forming Galaxies
Calzetti, Daniela; Storchi-Bergmann, Thaisa; Bohlin, Ralph C. +3 more
We present far-infrared (FIR) photometry at 150 and 205 µm of eight low-redshift starburst galaxies obtained with the Infrared Space Observatory (ISO) ISOPHOT. Five of the eight galaxies are detected in both wave bands, and these data are used, in conjunction with IRAS archival photometry, to model the dust emission at λ>~40 µm. The…
Multiwavelength Observations of Dusty Star Formation at Low and High Redshift
Steidel, Charles C.; Adelberger, Kurt L.
If high-redshift galaxies resemble rapidly star-forming galaxies in the local universe, most of the luminosity produced by their massive stars will have been absorbed by dust and reradiated as far-infrared photons that cannot be detected with existing facilities. This paper examines what can be learned about high-redshift star formation from the s…
An Inventory of Interstellar Ices toward the Embedded Protostar W33A
van Dishoeck, E. F.; Whittet, D. C. B.; Schutte, W. A. +8 more
This paper presents, for the first time, a complete 2.4-25 µm spectrum of the dust-embedded young stellar object W33A. The spectrum was obtained with the Short Wavelength Spectrometer of the Infrared Space Observatory at a mean resolving power of ~750. The spectrum displays deep H2O ice and silicate absorptions centered at 3.0 and…
NGC 6153: a super-metal-rich planetary nebula?
Barlow, M. J.; Cohen, M.; Liu, X. -W. +3 more
We have obtained deep optical spectra of the planetary nebula NGC 6153, both along its minor axis and by uniformly scanning a long slit across the whole nebula. The scanned spectra, when combined with the nebular total Hβ flux, yield integrated fluxes for all the lines (~400) in our spectra, which are rich in strong recombination lines from C, N, …
Mid-infrared diagnostics to distinguish AGNs from starbursts
Cesarsky, C.; Madden, S. C.; Sauvage, M. +5 more
We present new mid-infrared (MIR) diagnostics to distinguish emission of active galactic nuclei (AGN) from that originating in starburst regions. Our method uses empirical spectroscopic criteria based on the fact that MIR emission from star forming or active galaxies arises mostly from HII regions, photo-dissociation regions (PDRs) and AGNs. The a…
The Composition and Distribution of Dust along the Line of Sight toward the Galactic Center
Lutz, D.; van Dishoeck, E. F.; Whittet, D. C. B. +5 more
We discuss the composition of dust and ice along the line of sight to the Galactic center (GC) based on analysis of mid-infrared spectra (2.4-13 µm) from the Short Wavelength Spectrometer on the Infrared Space Observatory (ISO). We have analyzed dust absorption features arising in the molecular cloud material and the diffuse interstellar med…
Photochemistry of Saturn's Atmosphere. I. Hydrocarbon Chemistry and Comparisons with ISO Observations
Bézard, Bruno; Lellouch, Emmanuel; Moses, Julianne I. +3 more
To investigate the details of hydrocarbon photochemistry on Saturn, we have developed a one-dimensional diurnally averaged model that couples hydrocarbon and oxygen photochemistry, molecular and eddy diffusion, radiative transfer, and condensation. The model results are compared with observations from the Infrared Space Observatory (ISO) to place …
ISO-SWS spectra of galaxies: Continuum and features
Lutz, D.; Genzel, R.; Sturm, E. +5 more
We present an inventory of mid-infrared spectral features detected in high resolution (R ~ 1500) ISO-SWS 2.4-45mu m spectra of the galaxies
An ISOCAM absorption survey of the structure of pre-stellar cloud cores
Abergel, A.; Puget, J. -L.; Bontemps, S. +3 more
We present the results of a mid-infrared (lambda =~ 7 mu m) imaging survey of a sample of 24 starless dense cores carried out at an angular resolution of 6arcsec with the ISOCAM camera aboard the Infrared Space Observatory (ISO). The targeted cores are believed to be pre-stellar in nature and to represent the initial conditions of low-mass, isolat…
Massive Star Formation and Evolution in Starburst Galaxies: Mid-infrared Spectroscopy with the ISO Short Wavelength Spectrometer
Förster Schreiber, Natascha M.; Lutz, Dieter; Spoon, Henrik W. W. +4 more
We present new Infrared Space Observatory Short Wavelength Spectrometer data for a sample of 27 starburst galaxies, and with these data we examine the issues of formation and evolution of the most massive stars in starburst galaxies. Using starburst models which incorporate time evolution, new stellar atmosphere models for massive stars, and a sta…