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Shi, Yong
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article
Infrared Luminosities and Aromatic Features in the 24 μm Flux-limited Sample of 5MUSES
Abstract
We study a 24 μm selected sample of 330 galaxies observed with the infrared spectrograph for the 5 mJy Unbiased Spitzer Extragalactic Survey. We estimate accurate total infrared luminosities by combining mid-IR spectroscopy and mid-to-far infrared photometry, and by utilizing new empirical spectral templates from Spitzer data. The infrared luminosities of this sample range mostly from 10<SUP>9</SUP> L <SUB>sun</SUB> to 10<SUP>13.5</SUP> L <SUB>sun</SUB>, with 83% in the range 10<SUP>10</SUP> L <SUB>sun</SUB> < L <SUB>IR</SUB> < 10<SUP>12</SUP> L <SUB>sun</SUB>. The redshifts range from 0.008 to 4.27, with a median of 0.144. The equivalent widths of the 6.2 μm aromatic feature have a bimodal distribution, probably related to selection effects. We use the 6.2 μm polycyclic aromatic hydrocarbon equivalent width (PAH EW) to classify our objects as starburst (SB)-dominated (44%), SB-AGN composite (22%), and active galactic nucleus (AGN)-dominated (34%). The high EW objects (SB-dominated) tend to have steeper mid-IR to far-IR spectral slopes and lower L <SUB>IR</SUB> and redshifts. The low EW objects (AGN-dominated) tend to have less steep spectral slopes and higher L <SUB>IR</SUB> and redshifts. This dichotomy leads to a gross correlation between EW and slope, which does not hold within either group. AGN-dominated sources tend to have lower log(L <SUB>PAH7.7 μm</SUB>/L <SUB>PAH11.3 μm</SUB>) ratios than star-forming galaxies, possibly due to preferential destruction of the smaller aromatics by the AGN. The log(L <SUB>PAH7.7 μm</SUB>/L <SUB>PAH11.3 μm</SUB>) ratios for star-forming galaxies are lower in our sample than the ratios measured from the nuclear spectra of nearby normal galaxies, most probably indicating a difference in the ionization state or grain size distribution between the nuclear regions and the entire galaxy. Finally, we provide a calibration relating the monochromatic continuum or aromatic feature luminosity to L <SUB>IR</SUB> for different types of objects....