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We present spectroscopic results for all galaxies observed with the SpitzerInfrared Spectrograph (IRS) which also have total infrared fluxes f(ir)measured with the Infrared Astronomical Satellite (IRAS), also using AKARIphotometry when available. Infrared luminosities and spectral energydistributions (SEDs) from 8 um to 160 um are compared to polycyclic aromatichydrocarbon (PAH) emission from starburst galaxies or mid-infrared dustcontinuum from AGN at rest frame wavelengths ~ 8 um. A total of 301 spectra areanalyzed for which IRS and IRAS include the same unresolved source, as measuredby the ratio fv(IRAS 25 um)/fv(IRS 25 um). Sources have 0.004 < z < 0.34 and42.5 < log L(IR) < 46.8 (erg per s) and cover the full range of starburstgalaxy and AGN classifications. Individual spectra are provided electronically,but averages and dispersions are presented. We find that log [L(IR)/vLv(7.7um)] = 0.74 +- 0.18 in starbursts, that log [L(IR)/vLv(7.7 um)] = 0.96 +- 0.26in composite sources (starburst plus AGN), that log [L(IR)/vLv(7.9 um)] = 0.80+- 0.25 in AGN with silicate absorption, and log [L(IR)/vLv(7.9 um)] = 0.51 +-0.21 in AGN with silicate emission. L(IR) for the most luminous absorption andemission AGN are similar and 2.5 times larger than for the most luminousstarbursts. AGN have systematically flatter SEDs than starbursts or composites,but their dispersion in SEDs overlaps starbursts. Sources with the strongestfar-infrared luminosity from cool dust components are composite sources,indicating that these sources may contain the most obscured starbursts.

Infrared Spectra and Spectral Energy Distributions for Dusty Starbursts and AGN