Ultraluminous infrared galaxies: Starburst vs. AGN |
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| Institution: | 1. State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Key Laboratory of Optoelectronic Information Processing of Guangxi Colleges and Universities, Guilin 541004, Guangxi, China;3. Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Department of Micro/Nano Electronics, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;4. National and Local Joint Engineering Laboratory of Internet Technology on Mine, School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China;5. School of Physics and Telecommunication Engineering, Guangxi Colleges and Universities Key Lab of Complex System Optimization and Big Data Processing, Yulin Normal University, Yulin 537400, Guangxi, China |
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| Abstract: | We have obtained ISOPHOT-S low resolution mid-infrared spectra of a sample of 60 Ultraluminous Infrared Galaxies (ULIRGs). We use the strength of the ‘PAH’ mid-infrared features as a discriminator between starburst and AGN activity, and to probe for evolutionary effects. Observed ratios of PAH features in ULIRGs differ slightly from those in lower luminosity starbursts. We suggest that such PAH ratio changes relate to the conditions in the interstellar medium in these galaxies, and in particular to extinction. |
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