Recent multi-wavelength insights into Little Red Dots and their connection to quasars
Speaker: Kohei Ichikawa (Tohoku University)
Abstract:
The James Webb Space Telescope (JWST) has unveiled numerous massive
black holes (BHs) in faint, broad-line active galactic nuclei (AGN), even though their survey areas are only ~10^2 arcmin^2, which were previously considered too small for significant number of AGN discoveries before the JWST launch. This discovery highlights the presence of a AGN population with “V-shape” UV-optical spectral shape, referred to as little red dots (LRDs), which are more abundant than X-ray selected AGN.
In this talk, we summarize the recent multiwavelength observational properties of LRDs and discuss what we can learn from them about the growth of supermassive black holes (SMBHs) in the early Universe at z>=5. I will also explore the recent observational results for identifying high-luminosity and/or low-redshift analogs of LRDs using past and ongoing surveys such as UNIONS, PFS, Euclid, JWST and VLA 3GHz radio surveys. I will especially highlight a newly identified population, called BBQSORS (BlackBody QSO and Radio Sources), and I will explore how LRD systems may evolve into the luminous quasars observed in the z<4 Universe.