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Date and Time of the Query: 2019-08-24 T21:00:31 PDT
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For refcode 1999MNRAS.307..553D:
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Copyright by Royal Astronomical Society. 1999MNRAS.307..553D New 8-13 micron spectroscopy of luminous and ultraluminous infrared galaxies C. C. Dudley Accepted 1999 March 5. Received 1999 March 1; in original form 1998 May 29 ABSTRACT New moderate-resolution mid-infrared spectroscopy at 10 microns of 27 infrared galaxies is presented. The galaxies have been chosen from three 60-micron selected and one l2-micron selected complete flux-limited catalogues of galaxies; 17 of these sources have L_IR_(8-1000micron) >= 5 x 10^11^ L_sun_. A high-resolution spectrum of the source Arp 299B1 is also presented. Combining these new results with previously published results, a nearly complete 60-micron selected flux-limited subsample, with L_IR_(8-1000 micron) >= 1.6 x 10^11^ L_sun_, of 25 galaxies is defined. Within this subsample, it is found that the dominant power source of infrared galaxies in the luminosity range 1.6 x 10^11^ < L_IR_(8- 1000micron) < 10^12^L_sun_ is massive star formation based on the clear presence of the 11.3-micron aromatic hydrocarbon emission feature in the majority of the spectra. Three of the five ultraluminous infrared galaxies [L_IR_(8-1000 micron) >= 10^12^L_sun_] within this subsample show evidence that an active galactic nucleus provides an energetically important power source based on the detection of silicate absorption in their mid-infrared spectra. The physical basis of a possible anticorrelation between the 11.3- micron feature equivalent width and infrared light to molecular gas mass ratios is discussed. Key words: dust, extinction - galaxies: active - galaxies: starburst - infrared: galaxies.
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