USTC Astronomy Seminar Series: 2019 Spring
The Role of Environment in Radio Galaxies
沈璐 博士后
University of California, Davis
2019/6/18, 4:00pm , the 19th-floor Observatory Hall
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 FarInfrared wavelength in radio galaxies using CIGALE.
Lu Shen is a graduate student from the Department of Physics at University of California, Davis. She is focusing on radio galaxy and their environmental effect at z~1. She is familiar with multi-wavelength imaging, especially, long wavelength data reduction and analysis. After graduation, she will join USTC to conduct her postdoctoral research, continuing her studies on the effect of environments on the galaxy evolution