Oral Presentation

EIGER, a JWST GTO project, and ALMA detections of CIV-host galaxies in the EoR

Author(s): Daichi Kashino (Nagoya University)

Presenter: Daichi Kashino (Nagoya University)

We introduce our JWST GTO program, EIGER (Emission-line galaxies and Intergalactic Gas in the Epoch of Reionization), and present our new detections of CIV-absorber-host galaxies at z~5.7 from our complementary ALMA observations. Our EIGER project aims to understand the process of cosmic reionization, the evolution of young galaxies, and the formation of supermassive black holes in the Epoch of Reionization. We use NIRCam to carry out slitless spectroscopy of z∼6 star-forming galaxies in the fields of six z > 6 bright quasars and correlate the distribution and properties of these galaxies with the conditions of the inter/circumgalactic media along the lines of sight, which are provided from the spectra of the background quasars. Our team is also carrying out complementary observations in our target fields from space and ground. In particular, we conducted ALMA observations to blindly search for [CII]-emitting galaxies along the quasars' line of sight at z~5--6 and discovered two significant detections of [CII]-emitting galaxies at ~100 pkpc from the sightline at redshifts within 700 km/s of the absorber redshifts. These objects are thought to be relatively massive members of overdensities, suggested from detections of, plausibly less-massive, LAEs at the same redshifts.