scholarly journals ISOPHOT Observations of a Cold Filament in the Local Hot Bubble

1997 ◽  
Vol 166 ◽  
pp. 117-120
Author(s):  
Uwe Herbstmeier ◽  
Alexandre Wennmacher
Keyword(s):  
Radiation Field ◽  
Uv Radiation ◽  
Cirrus Clouds ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
Dust Temperature ◽  
Dust Component

AbstractWe report on FIR measurements of the dust component towards LVC 88+36–2, a dense neutral filament in the Local Hot Bubble. The measurements were performed with ISOPHOT, the photometer on-board ESA’s Infrared Space Observatory ISO. The dust temperature derived is about 18 K and stays constant across the filament. Limb brightening at 60μm is measured in agreement with cirrus clouds not located in the Local Hot Bubble. No evidence for an increased UV radiation field along the boundaries of the cloud is found.

scholarly journals Astromineralogy: Crystalline silicates

2003 ◽  
Vol 209 ◽  
pp. 291-298
Author(s):  
F. J. Molster
Keyword(s):  
Circumstellar Dust ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
Evolved Stars ◽  
Formation History ◽  
Long Time ◽  
Dust Component ◽  
The Many ◽  
Dust Distribution ◽  
First Time

Silicates are the most abundant dust component in our Universe. For a long time it was generally assumed that around evolved stars only amorphous silicates were present. The infrared space observatory (ISO; Kessler et al. 1996) discovered that the abundance of crystalline silicates can be quite significant. Thanks to ISO it is now for the first time possible to determine the exact chemical composition of the silicates, and in contrast to the amorphous silicates, the crystalline silicates turned out to be very Fe-poor (i.e. forsterite and enstatite). Careful investigations of the spectra of crystalline silicates in several conditions, both in laboratory and in space, have taken place. It was found that not only the abundance of the crystalline silicates is related to the spatial distribution of the circumstellar dust, but also the shape of the features differs between sources with and without a disk-like dust distribution. Because of the many spectral features of the crystalline silicates one can easily determine temperatures and mass ratios for enstatite and forsterite. But even single features contain interesting information. The position and FWHM of the 69.0 micron forsterite feature, might be used as a new diagnostic of characteristic temperatures of (crystalline) silicate dust, while the 33.6 micron forsterite feature bears evidence for its formation history.

scholarly journals AGN Spectra as Seen by the Infrared Space Observatory: First Results

1997 ◽  
Vol 159 ◽  
pp. 333-336
Author(s):  
D. Lutz ◽  
R. Genzel ◽  
E. Sturm ◽  
A.F.M. Moorwood ◽  
E. Oliva ◽  
...  
Keyword(s):  
Fine Structure ◽  
Short Wavelength ◽  
Molecular Hydrogen ◽  
Molecular Gas ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
First Results ◽  
External Galaxies ◽  
First Time ◽  
Fine Structure Lines

AbstractWe discuss 2.5–45 µm spectra of the Circinus galaxy and of Cen A, obtained with the Short Wavelength Spectrometer (SWS) on board the Infrared Space Observatory. The large number of detected ionic fine structure lines, observable also in visually obscured sources, provides strong constraints on the shape of the ionizing spectrum, which is found to exhibit a UV bump peaking at ~ 70 eV in the case of Circinus. Pure rotational emission of molecular hydrogen, directly probing warm molecular gas, can for the first time be detected in external galaxies.

The 2.4– spectrum of Mars observed with the infrared space observatory

2000 ◽  
Vol 48 (12-14) ◽  
pp. 1393-1405 ◽  
Author(s):  
E Lellouch ◽  
T Encrenaz ◽  
T de Graauw ◽  
S Erard ◽  
P Morris ◽  
...  
Keyword(s):  
Space Observatory ◽  
Infrared Space Observatory

scholarly journals Seyfert galaxies: a perspective with ISO-PHOT

1999 ◽  
Vol 193 ◽  
pp. 750-751
Author(s):  
Ana M. Pérez García ◽  
J.M. Rodríguez Espinosa
Keyword(s):  
Temperature Distribution ◽  
Far Infrared ◽  
Seyfert Galaxies ◽  
Inversion Method ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
Energy Distributions ◽  
Spectral Components ◽  
Ir Emission

We present mid and far-infrared energy distributions of the CfA Seyfert sample, obtained with the Infrared Space Observatory photometer (ISO-PHOT). To analyse the CfA Seyfert SEDS, we apply an inversion method: the Inverse Planckian Transform, assuming that the mid- and far-IR emission is thermal. We obtain the spectral temperature distribution of sources that reproduces the observed SEDS. We compare the parameters of the spectral components found showing that there are not differences between Seyfert 1 and Seyfert 2 as for their temperatures while the emission between 12 and 25 μm is anisotropic.

ISOCAM--the Infrared Space Observatory camera: results of testing and calibrations

1993 ◽  
Author(s):  
Laurent G. Vigroux ◽  
Catherine J. Cesarsky ◽  
Olivier Boulade ◽  
Yvon Rio ◽  
Michel Perault ◽  
...  
Keyword(s):  
Space Observatory ◽  
Infrared Space Observatory
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