ICRR young researchers' workshop

Session

15 Jul 2026, 16:20

Large Seminar Room 601 (Kashiwa) (Kashiwa)

Conveners

Session 5: Obs. Cosmology

• Masayuki Harada ()

Contribution list Timetable

29. Cosmic Reionization and Cosmological Parameters

Yuta Kageura

15/07/2026, 16:20

JWST observations of high-redshift galaxies have greatly advanced our understanding of cosmic reionization. Since reionization affects the CMB, I will present our recent results on constraining cosmological parameters using these galaxy observations.

30. A Scaling Relation of “Little Red Dots” between Halpha and Bolometric Luminosities: Enhanced Halpha Emission Relative to Low-z Type 1 AGNs

Hiroto Yanagisawa

15/07/2026, 16:35

We investigate the spectroscopic demography of “little red dots” (LRDs) using 37 objects at z~3–7 compiled from various JWST programs. We identifiy a tight scaling relation between Ha luminosity (L_Ha) and bolometric luminosity (L_bol), which is enhanced by a factor of ~40 in L _Ha relative to that of low-z type 1 AGN. We explore the physical origin of this enhancement based on the classic...

31. Early Chemical Enrichment in UV-Bright Galaxies at the Epoch of Reionization Probed by JWST Absorption-Line Analysis

Minami Nakane

15/07/2026, 16:50

Using JWST/NIRSpec medium-resolution spectra of UV-bright
galaxies at z=7.2-10.6, we investigate interstellar absorption lines to
probe the physical properties of mostly neutral gas and the early
chemical enrichment of galaxies during the epoch of reionization.

32. Statistical Rethinking: overmassive blackhole at high-z universe

Chenghao Zhu

15/07/2026, 17:05

We will present a statistical rethinking of the phenomenon that the AGN in the high-z universe tends to have overmassive black holes. The result will be revisited in the aspect of both more stable statistical index and more sources.