the draco nebula is a high latitude molecular cloud which is supposed to interact with hi high velocity clouds (hvcs). hi 21cm line observa- tions suggest that the edge of the draco nebula towards low galactic latitudes and longitudes is representing a low velocity shock front due to the collisional interaction between the hvcs and galactic disk gas. the unusual high co abundance compared to neutral hydrogen found at this edge and the enhanced soft x-ray background emission found in the region of the draco nebula also fit into this picture. however a final confirmation of this interaction scenario fails up to now. we propose to use pht to observe the emission of the dust in order to look for variations of the dust temperature and composition across this filament. in addition we want to observe with the lws the fine- structure lines of cii (158 um), oi (63 um) and nii (122 um) across the same feature. these lines will give information about the heating/cooling balance of this filament and on the density and tempe- rature variations. moreover, we want to look for small, very small grains and especially pahs in the draco nebula, using the short wavelength bands of pht. since the draco nebula has dust counterparts in all four iras bands, this nebula is a prominent candidate for the detection of pahs in a galactic cirrus cloud and as well for studying the influence of a shock wave on these very small particles.
Instrument
LWS02 , PHT03 , PHT22
Temporal Coverage
1996-08-19T21:14:20Z/1997-01-31T12:09:02Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, MORITZ et al., 1999, 'INFRARED PHOTOMETRIE AND SPECTROSCOPY OF THE DRACO NEBULA', 1.0, European Space Agency, https://doi.org/10.5270/esa-w110mdb
