Seminar Title:	Infrared Properties of Interacting Galaxies: from Spirals to ULIRGs
Speaker:	Dr. Vassilis Charmandaris
Affiliation:	(University of Crete, Greece)
When:	Tuesday Morning, Oct. 19th, 10:30 a.m
Where:	Room 327, Office Block, 2 West Beijing Road (PMO, CAS)
	Welcome to Attend
	( PMO Academic Committee & Academic Circulating committee)

　Abstract　 

 Interactions between galaxies lead to massive star formation over extended spatial scales where the properties of interstellar radiation field, gas and dust content vary substantially. Interactions were more frequent in the past and it the principal mechanism of galaxy evolution, often leading to the formation of ultraluminous infrared systems (ULIRGs). While rare in the local Universe, ULIRGs play a dominant role in producing the far-infrared background as well as the star formation energy density at high redshifts. I will review the mid infrared properties of interacting galaxies as these were revealed using observations from the Spitzer Space Telescope. An emphasis will be given to the use of variations in the infrared spectral energy distributions as a tracer of the  physical mechanism dominating the energyproduction in these systems.