S20A0073abst
S20A0073
We propose to re-observe the COSMOS UltraDeep (UD) field with HSC g, r, i, and z bands to construct an unprecedentedly deep and wide optical variability-selected AGN sample. The COSMOS UD field was first observed with HSC in 2014, and then the same field has been observed in the last three years as a part of HSC-SSP transient survey (in 2016-2017), the Subaru Intensive Program for the transient survey (in 2018), and HSC-SSP observations (in 2019), although the image quality, data sampling, and used filters are heterogeneous. The proposed additional single-epoch COSMOS UD g, r, i, and z band data in 2020 will significantly increase the 90% completeness magnitude limit of the variability-based AGN selection from i=22 mag to i=24 mag, and enable us to build a redshift/luminosity less-biased sample of type 1 AGNs in the COSMOS. Using the HSC COSMOS variability-selected AGN sample, we will (1) examine type 1 AGN fraction among X-ray selected AGNs by comparing the variability-selected AGN catalog with the Chandra-COSMOS X-ray source catalog, and (2) find a statistical sample of very low black hole mass AGNs and examine the AGN occupation fraction in dwarf galaxies to put an observational constraint on supermassive black hole seed formation models.
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