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

TL;DR

The paper introduces the IDEOS database containing mid-infrared observables for 3335 galaxies, highlighting the detection of crystalline silicates in most spectra and their potential as indicators of galactic nucleus obscuration.

Contribution

This work provides a comprehensive, publicly accessible database of mid-infrared galaxy spectra and demonstrates the diagnostic power of crystalline silicate features for understanding galactic obscuration.

Findings

Crystalline silicates detected in over 95% of galaxy spectra.

Crystalline silicate band strength correlates with amorphous silicate strength.

Crystalline silicate features can classify galactic nucleus obscuration levels.

Abstract

We present the Infrared Database of Extragalactic Observables from Spitzer (IDEOS), a homogeneous, publicly available, database of 77 fitted mid-infrared observables in the 5.4-36um range, comprising measurements for 3335 galaxies observed in the low-resolution staring mode of the Infrared Spectrometer onboard the Spitzer Space Telescope. Among the included observables are PAH fluxes 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 IDEOS spectra were selected from the Cornell Atlas of Spitzer-IRS Sources. To our surprise we have detected at a >95% confidence level crystalline silicates in the spectra of 786 IDEOS galaxies. The detections range from single band detections to detections of all fitted crystalline bands (16, 19, 23, 28 and 33um). We find the strength of the crystalline silicate bands to correlate with the amorphous silicate strength, and the change from an emission to an absorption feature to occur at higher obscuration as the wavelength of the crystalline silicate band is longer. These observed characteristics are consistent with an origin for the amorphous and crystalline silicate features in a centrally heated dust geometry, either an edge-on disk or a cocoon. We find the 23 and 33um crystalline silicate bands to be well-suited to classify the obscuration level of galactic nuclei, even in the presence of strong circumnuclear star formation. Based on our detection statistics, we conclude that crystalline silicates are a common component of the interstellar medium of galactic nuclei.