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Edge-on spiral galaxies offer a unique perspective on disks. One canaccurately determine the height distribution of stars and ISM and theline-of-sight integration allows for the study of faint structures. The SpitzerIRAC camera is an ideal instrument to study both the ISM and stellar structurein nearby galaxies; two of its channels trace the old stellar disk with littleextinction and the 8 micron channel is dominated by the smallest dust grains(Polycyclic Aromatic Hydrocarbons, PAHs).  Dalcanton et al. (2004) probed the link between the appearance of dust lanesand the disk stability. In a sample of bulge-less disks they show how inmassive disks the ISM collapses into the characteristic thin dust lane. Lessmassive disks are gravitationally stable and their dust morphology isfractured. The transition occurs at 120 km/s for bulgeless disks.  Here we report on our results of our Spitzer/IRAC survey of nearby edge-onspirals and its first results on the NIR Tully-Fischer relation, and ISM diskstability.

Spitzer's View of Edge-on Spirals