Oral Presentation

Investigating the connection between AGNs and their host galaxy properties

Author(s): Li-Ting Hsu (ASIAA) Li-Hwai Lin (ASIAA)

Presenter: Li-Ting Hsu (ASIAA)

Many studies propose that the evolution of the galaxies related to the growth of the central super massive black hole (SMBH). One way to study the AGN-galaxy coevolution is to investigate the AGN impacts on their host galaxies. In our work, we present the study of the host galaxy properties of the X-ray selected AGNs in the Chandra Deep Field South. We did the AGN/host galaxy decomposition based on the SED fitting results of our well-trained AGN-galaxy hybrids, and made corrections for the dust extinction and AGN contribution to get more accurate AGN host fluxes. For the AGN-dominated type 1 AGNs, it is not surprising to find that their host are strongly effected by the AGN contribution rather than the dust extinction. While for the host-dominated type 2 AGN, the correction for the dust extinction is larger than the correction for the AGN contribution. Similar to normal galaxies, AGN host colors also present bimodality in the color-magnitude diagram. However, there are more AGN hosts appear in the green valley. This shows that the green-valley objects could be in the evolutionary stage between star-forming (blue cloud) and passive (red sequence) galaxies, undergoing the quenching of star formation. I will present the host-galaxy stellar properties of different types of AGNs to further study the AGN impact on the galaxy evolution.