题 目：Millimetre observations of z~2 ULIRGs detected by Spitzer Submillimeter Galaxies (SMGs) from Spitzer to Herschel
报告人：Dr. Alain Omont
(Insitut d'Astrophysique de Paris)
The wide Spitzer surveys, such as SWIRE, have detected many high-z ULIRGs similar to the submillimeter galaxies (SMG) detected by SCUBA or MAMBO, but much more numerous because of much wider areas. With IRAM-30m/MAMBO, we are carrying out a 1.2mm program of characterization of the far-infrared emission and star formation of SWIRE selected ULIRGs. We aim thus at the largest existing star formation rates, approaching 10^3 Mo/yr, in starburst-dominated and in AGN-starburst composite SWIRE sources. 1.2mm detected objects include about 40 z~2 starbursts displaying a secondary stellar peak redshifted at ~5.8 micron. The latter 1.2mm detections confirm that they belong to a subclass of z~2 starburst SMGs characterized by a very large stellar mass and a high ratio of PAH/far-IR emission. There are thousands of galaxies easily identifiable among SWIRE galaxies with similar criteria. Their mm-IR-optical-radio spectral energy distribution will be discussed, in particular with the help of deep radio data and 350um detections with CSO/SHARC-2. They could be progenitors of massive ellipticals in the process of one of their last major gaseous mergers, with a possible extended starburst. They trace well massive dark matter halos at z~2.
I will also briefly discuss more recent mm/submm results at high z with MAMBO/IRAM-30m, LABOCA/APEX and IRAM-Interferometer, as well as prospects of combined Herschel-Spitzer-IRAM studies, especially with Herschel data from GTO and GO surveys.
地 点：（北京西路2号）紫台大楼3楼327 室
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