APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Koki Kakiichi (UCSB)
Title: IGM Tomography with Subaru/HSC: implications to reionization and SMBH
Date (JST): Thu, Aug 18, 2022, 11:00 - 12:00
Place: Hybrid
Abstract: The art of cosmography, i.e. map-making of the Universe, is essential for the progress in astronomy. In this talk, I present a new technique to reconstruct a large-scale structure of the intergalactic medium (IGM) using a unique combination of the narrow-band filters with Subaru/HSC. The technique is applicable to high redshifts across z~4-6 and is perfectly suited to examine the ionizing radiation and the gaseous environment of galaxies and quasars. I demonstrate the method using the public release of HSC data and present the first co-spatial, large-scale map of the Lyman-alpha emitters and the IGM in the COSMOS field at z~5. I also discuss the potential applications of IGM tomography and the implications for our understanding of reionization and the growth of supermassive black holes.