The Role of Environment in Radio Galaxies

Using imaging from the Very Large Array at 1.4GHz, I have compiled a large sample of radio galaxies from the Observations of Redshift Evolution in Large Scale Environments (ORELSE) survey, a survey aimed at systematically searching for large-scale structures in the redshift range of 0.6 < z < 1.3. By virtue of multi-wavelength imaging and high quality spectroscopy, as well as a wide dynamic range of environments sampled by this survey, I classified radio galaxies to three types: AGN, Hybrid and Star Forming Galaxies, and further separated them into different environments. In this talk, I will focus on the radio AGN, and, particularly, the possible effect of radio AGN on their neighboring galaxies. After carefully constructing and comparing to non-radio-detected control samples, a possible signature of additional quenching on radio AGN neighbors was found in high density cluster environments. I will discuss scenarios which may possibly explain this signature, including the possible heating of the intracluster medium due to radio AGN activity. Finally, I will discuss a new constraint on the fraction of AGN contribution from Mid- to Far-Infrared wavelength in radio galaxies using CIGALE.  

Speaker: 
Lu Shen (University of California, Davis)
Location: 
KIAA 1st meeting room
Time: 
Wed, 2019-06-19 12:00 to 13:00