Unveiling quasar host galaxies and their Lyα emission at z~6 by SHELLQs

Simon C.-C. Ho^1*, Tomotsugu Goto¹, Tetsuya Hashimoto¹

¹Institute of Astronomy, National Tsing Hua University, Hsinchu, Taiwan

* Presenter:Simon C.-C. Ho, email:hosimon259@gmail.com

Host galaxies of high redshift quasars (QSOs) are of interest. These very luminous black holes allow to investigate the physics relevant to the starburst-active galactic nuclei (AGN) connection at the earliest epoch of the Universe. Here we report an optical detection of an extended structure around a stacked QSO image. We have stacked 46 high-z (z_median = 6.13) QSOs images by Subaru/Hyper Suprime-Cam. These QSOs are mainly identified by the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project. We have carefully subtracted a point spread function (PSF) constructed using nearby stars from the images. After the PSF (QSO) subtraction, a structure in the z-band extends for more than 4" on the sky (R_e = 9.3kpc). The stacked host may be forming giant galaxies, co-evolving with a supermassive black hole. More analysis will be carried out in the future.

Keywords: high redshift quasars, host galaxies