Search Publications
The rich 6 to 9 vec mu m spectrum of interstellar PAHs
Hony, S.; Tielens, A. G. G. M.; Allamandola, L. J. +4 more
IR spectroscopy provides a valuable tool for the characterisation and identification of interstellar molecular species. Here, we present 6-9 µm spectra of a sample of reflection nebulae, HII regions, YSOs, evolved stars and galaxies that show strong unidentified infrared bands, obtained with the SWS spectrograph on board ISO. The IR emission…
The bulk of the cosmic infrared background resolved by ISOCAM
Aussel, H.; Elbaz, D.; Franceschini, A. +4 more
Deep extragalactic surveys with ISOCAM revealed the presence of a large density of faint mid-infrared (MIR) sources. We have computed the 15 mu m integrated galaxy light produced by these galaxies above a sensitivity limit of 50 mu Jy. It sets a lower limit to the 15 mu m extragalactic background light of (2.4 +/- 0.5) nW m-2 sr-1<…
Mid-Infrared line diagnostics of active galaxies. A spectroscopic AGN survey with ISO-SWS
Lutz, D.; Genzel, R.; Sturm, E. +5 more
We present medium resolution (R ~ 1500) ISO-SWS 2.4-45 mu m spectra of a sample of 29 galaxies with active nuclei. This data set is rich in fine structure emission lines tracing the narrow line regions and (circum-)nuclear star formation regions, and it provides a coherent spectroscopic reference for future extragalactic studies in the mid-infrare…
Crystalline silicate dust around evolved stars. II. The crystalline silicate complexes
Waters, L. B. F. M.; Tielens, A. G. G. M.; Molster, F. J.
This is the second paper in a series of three in which we present an exhaustive inventory of the solid state emission bands observed in a sample of 17 oxygen-rich dust shells surrounding evolved stars. The data were taken with the Short and Long Wavelength Spectrographs on board of the Infrared Space Observatory (ISO) and cover the 2 to 200 mu m w…
Do the Infrared Emission Features Need Ultraviolet Excitation? The Polycyclic Aromatic Hydrocarbon Model in UV-poor Reflection Nebulae
Draine, B. T.; Li, Aigen
One of the major challenges to identification of the 3.3, 6.2, 7.7, 8.6, and 11.3 µm interstellar infrared (IR) emission bands with polycyclic aromatic hydrocarbon (PAH) molecules has been the recent detection of these bands in regions with little ultraviolet (UV) illumination, since small, neutral PAH molecules have little or no absorption …
Cold Dust in Late-Type Virgo Cluster Galaxies
Madore, Barry F.; Tuffs, Richard J.; Popescu, Cristina C. +2 more
We have statistically analyzed the spatially integrated far-infrared (FIR) emissions of the complete volume- and luminosity-limited sample of late-type (later than S0) Virgo Cluster galaxies measured using the Infrared Space Observatory by Tuffs and coworkers in bands centered on 60, 100, and 170 µm. Thirty of 38 galaxies detected at all thr…
Crystalline silicate dust around evolved stars. III. A correlations study of crystalline silicate features
Waters, L. B. F. M.; Tielens, A. G. G. M.; Koike, C. +2 more
We have carried out a quantitative trend analysis of the crystalline silicates observed in the ISO spectra of a sample of 14 stars with different evolutionary backgrounds. We have modeled the spectra using a simple dust radiative transfer model and have correlated the results with other known parameters. We confirm the abundance difference of the …
The FIR/Radio correlation of high redshift galaxies in the region of the HDF-N
Garrett, M. A.
The correlation between the far-infrared (FIR) and radio emission is well established for nearby star forming galaxies. Many applications, in particular the radio-to-submm spectral index redshift indicator, tacitly assume that the relation holds well beyond our local neighbourhood, to systems located at cosmological distances. In order to test thi…
ISO spectroscopy of compact H II regions in the Galaxy. I. The catalogue
Kessler, M. F.; Morisset, C.; Schaerer, D. +9 more
Infrared spectra between 2.3 and 196 µm were taken towards a sample of 45 compact H II regions using the two spectrometers (SWS and LWS) on board ISO. The primary goal is to determine the distribution of element abundances in the Galaxy, although there are also many other uses of this database. The spectra contain a wealth of information on …
An ISO-SWS survey of molecular hydrogen in starburst and Seyfert galaxies
Lutz, D.; Genzel, R.; Rigopoulou, D. +2 more
We present results from a survey of molecular hydrogen emission from a sample of Starburst and Seyfert galaxies carried out with the Infrared Space Observatory (ISO). Pure rotational H2 emission has been detected in a number of extragalactic objects and a variety of environments. A number of transitions from S(7) to S(0) are detected in…