The MBH-M∗ Relation up to z ∼ 2 through Decomposition of COSMOS-Web NIRCam Images
Our knowledge of relations between supermassive black holes and their host galaxies at z greater than or similar to 1 is still limited, even though being actively sought out to z similar to 6. Here, we use the high resolution and sensitivity of JWST to measure the host galaxy properties for 107 X-ray-selected type-I AGNs at 0.68<z<2.5 with rest-frame optical/near-infrared imaging from COSMOS-Web and PRIMER. Black hole masses (log(M-BH/M-circle dot)similar to 6.9-9.6) are available from previous spectroscopic campaigns. We extract the host galaxy components from four NIRCam broadband images and the HST/ACS F814W image by applying a 2D image decomposition technique. We detect the host galaxy for similar to 90% of the sample after subtracting the unresolved AGN emission. With host photometry free of AGN emission, we determine the stellar mass of the host galaxies to be log(M-& lowast;/M-circle dot)similar to 9.5-11.6 through SED fitting and measure the evolution of the mass relation between SMBHs and their host galaxies. Considering selection biases and measurement uncertainties, we find that the MBH/M & lowast; ratio evolves as (1+z)(0.48)(+0.31)(-0.62) thus remains essentially constant or exhibits mild evolution up to z similar to 2.5. We also see an amount of scatter (sigma(mu) = 0.30(-0.13)(+0.14)), similar to the local relation and consistent with low-z studies, and a non-causal cosmic assembly history where mergers contribute to the statistical averaging towards the local relation is still feasible. We highlight improvements to come with larger samples from JWST and, particularly, Euclid, which will exceed the statistical power of current wide and deep surveys.
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