Oral Presentation

Probabilistic Selection of z>6 Quasars: Initial Results from the First HSC SSP Data

Author(s): Masafusa Onoue (GUAS/NAOJ) and the HSC project #47 members

Presenter: Masafusa Onoue (GUAS/NAOJ)

We will present our high-z quasar selection method using SED fitting and its application to the first HSC-SSP data.
While it is a well-known problem that the classical quasar selection based on two colors suffers from contaminating sources such as brown dwarfs, photometric redshift with multi-color photometry is a complementary way to effectively isolate high-z quasars. Since photo-z for AGN has been less explored comparing with photo-z for galaxies, we have developed template SED fitting method by ourselves to construct the largest z>6 quasar sample with the HSC survey.
In this talk, we will show how our selection works on the existing quasar samples such as SDSS DR9 quasar catalog and z>3 quasars in the COSMOS field.
Then, we’d like to report the result of our first application to the HSC-SSP data products together with NIR VISTA/VIKING catalog, which results in five z>6 quasar candidates including one possible highest-redshift (z_photo=7.3) quasar.