0 Assigned ID: 157 ----- Attempting Submission 1 (Wed Mar 04 16:19:46 GMT 2020) ----- Many active galactic nuclei (AGN) in the distant universe (z=1-3) are obscured, although the source of this obscuration is unclear. Obscuration can arise from the AGN torus or from the host galaxy, but distentangling these is difficult. We propose to reanalyse HST ACS and WFC3 images of X-ray selected AGN in the CANDELS legacy survey. We will decompose AGN images into a point source and host galaxy and model the resulting spectral energy distributions to obtain the attenuation in the host and AGN, separately. We will correlate the host and AGN obscuration with galaxy properties SFR, stellar mass, and stellar mass surface density. Our sample spans a wide range of stellar mass (log Mstar = 9.5-12.5 Msun) and X-ray luminosity (log LX = 42 - 45 erg/s), so we will measure whether most AGN in the distant universe go through an obscured phase prior to galaxy quenching. The PI and Co-Is are all members of CANDELS and have access to proprietary team products. The PI is an expert on obscured AGN, particularly at z=1-2, and will oversee all analysis and interpretation. The PI is also an expert at measuring SFRs in galaxies hosting AGN, a key part of this project. The majority of the analysis will be carried out by Co-I Hamblin as part of his thesis. Hamblin has two years of previous experience with UV/Optical SED fitting, particularly using AGNFitter. Co-I Kartaltepe is also an expert at SED-fitting and will aid in the analysis. Co-I Trump is a grism expert. He will oversee the grism analysis. He is also an optical AGN expert, and an expert at fitting obscured accretion disk models to UV/optical data. He will aid in analysis and interpretation of this portion of the project. Co-I Trump also has previous experience decomposing optical images into a point source and host galaxy and remeasuring magnitudes. Co-I Kocevski played an integral role in building team catalogs and in analysing X-ray AGN. He is an expert on measuring the host galaxy properties, particularly stellar surface mass densities, in X-ray AGN. Supermassive Black Holes and Active Galaxies 0 Regular false false false false false SUPPORTED