Search Publications
Steps toward interstellar silicate mineralogy. VII. Spectral properties and crystallization behaviour of magnesium silicates produced by the sol-gel method
Mutschke, H.; Henning, Th.; Posch, Th. +2 more
Amorphous silicate particles are generally assumed to be the main dust component in the envelopes of oxygen-rich evolved stars and may be considered the precursors of the pure crystalline enstatite and forsterite particles detected by ISO. We present optical constants in the broad wavelength range 0.2-500 mu m for a unique series of pure amorphous…
ISM properties in low-metallicity environments. II. The dust spectral energy distribution of NGC 1569
Bernard, J. -P.; Madden, S. C.; Galliano, F. +3 more
We present new 450 and 850 mu m SCUBA data of the dwarf galaxy NGC 1569. We construct the mid-infrared to millimeter SED of NGC 1569, using ISOCAM, ISOPHOT, IRAS, KAO, SCUBA and MAMBO data, and model the SED in order to explore the nature of the dust in low metallicity environments. The detailed modeling is performed in a self-consistent way, synt…
The origin of crystalline silicates in the Herbig Be star HD 100546 and in comet Hale-Bopp
Waters, L. B. F. M.; Dominik, C.; de Koter, A. +1 more
We have investigated the spatial distribution, and the properties and chemical composition of the dust orbiting HD 100546. This system is remarkably different from other isolated Herbig Ae/Be stars in both the strength of the mid-IR excess and the composition of the circumstellar dust. To explain spectral features and the amount of mid-IR dust emi…
Grain growth in the inner regions of Herbig Ae/Be star disks
Waters, L. B. F. M.; Dominik, C.; van Boekel, R. +4 more
We present new mid-infrared spectroscopy of the emission from warm circumstellar dust grains in Herbig Ae/Be stars. Our survey significantly extends the sample that was studied by Bouwman et al. (2001). We find a correlation between the strength of the silicate feature and its shape. We interpret this as evidence for the removal of small (0.1 mu m…
The ISO view of Palomar-Green quasars
Meisenheimer, K.; Krause, O.; Lemke, D. +8 more
Mining the ISO data archive we provide the complete ISO view of PG quasars containing 64 infrared spectral energy distributions between 5 and 200 mu m. About half of the sample was supplemented by MAMBO and SCUBA (sub-)millimetre data. Since the PG quasars were selected optically, the high infrared detection rate of more than 80% suggests that eve…
A mid-infrared spectroscopic survey of starburst galaxies: Excitation and abundances
Lutz, D.; Genzel, R.; Sturm, E. +3 more
We present spectroscopy of mid-infrared emission lines in twelve starburst regions, located in eleven starburst galaxies, for which a significant number of lines between 2.38 and 45 mum were observed with the ISO Short Wavelength Spectrometer, with the intention of providing a reference resource for mid-infrared spectra of starburst galaxies. The …
ISO spectroscopy of star formation and active nuclei in the luminous infrared galaxy NGC 6240
Lutz, D.; Genzel, R.; Sturm, E. +4 more
We present Infrared Space Observatory mid- and far-infrared spectroscopy of the merging galaxy
An ISOCAM survey through gravitationally lensing galaxy clusters. I. Source lists and source counts for A370, A2218 and A2390
Kneib, J. -P.; Altieri, B.; Elbaz, D. +11 more
ESA's Infrared Space Observatory (ISO) was used to perform a deep survey with ISOCAM through three massive gravitationally lensing clusters of galaxies. The total area surveyed depends on source flux, with nearly seventy square arcminutes covered for the brighter flux levels in maps centred on the three clusters Abell 370, Abell 2218 and Abell 239…
Origin of the 6.85 µm band near young stellar objects: The ammonium ion (NH4+) revisited
Schutte, W. A.; Khanna, R. K.
We have investigated whether the nu4 feature of NH4+ is a viable candidate for the 6.85 mu m absorption band seen towards embedded young stellar objects. To produce NH4+ astrophysical ice analogs consisting of H2O, CO2, NH3 and O2 were UV photolysed.…
H2 infrared line emission across the bright side of the rho Ophiuchi main cloud
Boulanger, F.; Abergel, A.; Falgarone, E. +3 more
We present imaging and spectroscopic observations of dust and gas (H2) emission, obtained with ISO, from the western edge of the rho Ophiuchi molecular cloud illuminated by the B2 star HD147889 (chi ~ 400). This photodissociation region (PDR) is one of the nearest PDRs to the Sun (d = 135 +/- 15 pc from the stellar parallax) and the lay…