Hitoshi Hanami

Unveiling Dusty Star Formation and AGN Activities in high-z LIRGs
When Mar 18, 2015 from 03:30 PM to 04:00 PM
  • Special Seminar
  • Colloquium
Where SH, Seminar room
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A major issue in observational cosmology is to reconstruct the growth history of galaxies and Active Galactic Nuclei (AGNs), which can be traced with Luminous InfraRed Galaxies (LIRGs) detected by the infrared observing satellites as the ISO, Spitzer, AKARI, and Herschel.  Their IR emissions are expected not only with Star Formation (SF) but also with AGN activities, which possibly regulate or quench the SF with their feedback mechanism in galaxy evolutions.   We can classify LIRGs into starburst (sb-LIRGs), starburst-AGN (s/a-LIRGs), and AGN (agn-LIRGs) populations with the flux ratio of FIR to MIR as the former and the later emitted from cold dusts in dusty star-forming regions and hot dusts in tori around AGNs, respectively.  These classified LIRGs with higher AGN activities show lower specific SF Ratio (sSFR). The SF/AGN distinction of these AKARI classified LIRGs becomes recently confirmed by using Chandra data (Krumpe+2015).  The IR SED analysis is a unique technique for studying co-evolution of dusty SF and AGN activities with dusty tori. I will discuss the hidden connection between dusty starbursts and AGNs, adding recent radio observational results obtained with the JVLA.