The following document lists the file abstract/DROUAN_EDGE_ISM.abs
from catalogue VI/111.
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===================================================================== ==> In this proposal, more time is being requested for DROUAN.EDGEPAH ==> Time for this proposal is to be transferred from DROUAN.EDGEPAH ===================================================================== In the proposal EDGEPAH we aimed at mapping, with ISOCAM, a few external spiral edge-on galaxies in dedicated PAH filters. Given the first results (CAM LW and PHT-S on one object: NGC5907), this program appears successful since 2 IR bands are indeed detected; however, because of the short time available, only 4 filters in CAM-LW were selected: this is clearly not enough for a safe interpretation. Also, the small raster was not optimum for a proper flat- fielding. We propose here to reshape the observations on one object not yet observed (N891) using more CAM filters with optimized rasters, and a CVF mapping on the central 6 kpc. Allocated time from DROUAN.EDGEPAH is transferred here. Beyond the proof of an universal presence of the PAH/VerySmallGrains component in the Diffuse Interstellar Medium of spiral galaxies, observations of edge-on galaxies, combined with maps at radio wavelengths (HI, HII, CO) and near-IR (stellar population), allow to study how the IR bands carriers abundance and state (ionization, hydrogenation) depend on the conditions of excitation and density at the scale of the galactic structure (nuclear region, bulge, disk, giant complexes); this is even more important since ISO shown that large variations in line ratios (including new lines, such as the 11.0 mic band) were related to the radiation density. The CVF mapping gives a unique opportunity to correlate spectral features with galactic structures at the scale of 200 pc.