Exploring the Mpc Environment of the Quasar ULAS J1342+0928 at z = 7.54

Understand

Theoretical models predict that z~6 quasars are hosted in the most massive halos of the underlying dark matter distribution and thus would be immersed in protoclusters of galaxies.

• However, observations report inconclusive results.
• We investigate the 1.1 pMpc2 environment of the z = 7.54 luminous quasar ULAS J1342+0928.
• We search for Lyman-break galaxy candidates (LBG) using deep imaging from the Hubble Space Telescope (HST) in the ACS/F814W, WFC3/F105W/F125W bands, and Spitzer/IRAC at 3.6 $\mu$m and 4.5 $\mu$m.