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We study a 24\,$\mu$m selected sample of 330 galaxies observed with theInfrared Spectrograph for the 5\,mJy Unbiased Spitzer Extragalactic Survey. Weestimate accurate total infrared luminosities by combining mid-IR spectroscopyand mid-to-far infrared photometry, and by utilizing new empirical spectraltemplates from {\em Spitzer} data. The infrared luminosities of this samplerange mostly from 10$^9$L$_\odot$ to $10^{13.5}$L$_\odot$, with 83% in therange 10$^{10}$L$_\odot$$<$L$_{\rm IR}$$<10^{12}$L$_\odot$. The redshifts rangefrom 0.008 to 4.27, with a median of 0.144. The equivalent widths of the6.2\,$\mu$m aromatic feature have a bimodal distribution. We use the6.2\,$\mu$m PAH EW to classify our objects as SB-dominated (44%), SB-AGNcomposite (22%), and AGN-dominated (34%). The high EW objects (SB-dominated)tend to have steeper mid-IR to far-IR spectral slopes and lower L$_{\rm IR}$and redshifts. The low EW objects (AGN-dominated) tend to have less steepspectral slopes and higher L$_{\rm IR}$ and redshifts. This dichotomy leads toa gross correlation between EW and slope, which does not hold within eithergroup. AGN dominated sources tend to have lower log(L$_{\rm PAH 7.7\mum}$/L$_{\rm PAH 11.3\mu m}$) ratios than star-forming galaxies, possibly due topreferential destruction of the smaller aromatics by the AGN. The log(L$_{\rmPAH 7.7\mu m}$/L$_{\rm PAH 11.3\mu m}$) ratios for star-forming galaxies arelower in our sample than the ratios measured from the nuclear spectra of nearbynormal galaxies, most probably indicating a difference in the ionization stateor grain size distribution between the nuclear regions and the entire galaxy.Finally, we provide a calibration relating the monochromatic 5.8, 8, 14 and24um continuum or Aromatic Feature luminosity to L$_{\rm IR}$ for differenttypes of objects.

Infrared Luminosities and Aromatic Features in the 24um Flux Limited Sample of 5MUSES