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  • Shocks or Photoionization: Ionization Mechanism for LIERs and their gas-phase abundances

     

     

    Seminar Title  

    Shocks or Photoionization: Ionization Mechanism for LIERs and their gas-phase abundances

       
    Speaker:   Dr YAN Renbin
       

     Affiliation:    

     (University of Kentucky)
       
    When

    Monday afternoon, July 9, 15:00 p.m

       

    Where:   

    Room 402, Astronomy Building
     

                             Welcome to Attend   

     
      ( PMO Academic Committee & Academic Circulating committee)
     

       Abstract: The ionization mechanism for the low-ionization emission line regions in quiescent galaxies has been puzzling us for decades. Shocks and photoionization models are the two most promising candidates. I will show direct gas temperature measurements from stacked spectra that can help differentiate the two mechanisms. Surprisingly, I found neither models could explain all of the observed line ratios, nor can the combinations of them do. I will also demonstrate how we can measure the gas-phase abundance patterns in them despite the uncertainty about their ionization mechanisms.

     

     

     

     

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