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We present the Infrared Database of Extragalactic Observables from Spitzer(IDEOS), a homogeneous, publicly available, database of 77 fitted mid-infraredobservables in the 5.4-36um range, comprising measurements for 3335 galaxiesobserved in the low-resolution staring mode of the Infrared Spectrometeronboard the Spitzer Space Telescope. Among the included observables are PAHfluxes and their equivalent widths, the strength of the 9.8um silicate feature,emission line fluxes, solid-state features, rest frame continuum fluxes,synthetic photometry, and a mid-infrared spectral classification. The IDEOSspectra were selected from the Cornell Atlas of Spitzer-IRS Sources. To oursurprise we have detected at a >95% confidence level crystalline silicates inthe spectra of 786 IDEOS galaxies. The detections range from single banddetections to detections of all fitted crystalline bands (16, 19, 23, 28 and33um). We find the strength of the crystalline silicate bands to correlate withthe amorphous silicate strength, and the change from an emission to anabsorption feature to occur at higher obscuration as the wavelength of thecrystalline silicate band is longer. These observed characteristics areconsistent with an origin for the amorphous and crystalline silicate featuresin a centrally heated dust geometry, either an edge-on disk or a cocoon. Wefind the 23 and 33um crystalline silicate bands to be well-suited to classifythe obscuration level of galactic nuclei, even in the presence of strongcircumnuclear star formation. Based on our detection statistics, we concludethat crystalline silicates are a common component of the interstellar medium ofgalactic nuclei.

The Infrared Database of Extragalactic Observables from Spitzer. -- II.  The Database & The Diagnostic Power of Crystalline Silicate Features in  Galaxy Spectra