activity
20142026
most citedThe Discovery of Timescale-Dependent Color Variability of Quasars

67 citations · 221 across the 18 of their papers we have counts for

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2 papers · 1 filter

astro-ph.GA2025

Discovery of an X-ray Luminous Radio-Loud Quasar at : A Possible Transitional Super-Eddington Phase

Sakiko Obuchi, Kohei Ichikawa, Satoshi Yamada +11

We report the multiwavelength properties of eFEDS J084222.9+001000 (hereafter ID830), a quasar at , identified as the most X-ray luminous radio-loud quasar in the eROSITA…

astro-ph.GA2025★ 5 cited

A z ~ 0.4 Galaxy Reflecting the high-redshift Little Red Dots: An Extended Starburst with an Overmassive Black Hole

Xiaoyang Chen, Kohei Ichikawa, Masayuki Akiyama +10

One of the most remarkable discoveries of JWST is a population of compact, red sources at z > 4, commonly referred to as Little Red Dots (LRDs). Spectroscopic identifications repor…