Author

Zhen-Ya Zheng

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Preprint Oct 2026

Rest-frame Ultraviolet Variability of Quasars in the Cosmic Himalayas Overdensity

Some high-redshift overdensities show an enhanced incidence of AGNs, suggesting that large-scale environment may influence supermassive black hole fuelling and triggering. Whether environment also affects AGN variability remains unclear. Using the Cosmic Himalayas (CH), an extreme concentration of 11 type 1 quasars at...

Jia-Qi Lin, Zhen-Ya Zheng, Bin Ma et al. · 0 citations

Preprint Oct 2026

PRISMS GHZ8: Evidence for a Young Burst and Potential Merger Activity at z=10.23

UV-bright galaxies in the early Universe provide important constraints on the rapid build-up of stellar mass and the sources responsible for cosmic reionization. However, the physical processes that drive their high UV luminosities remain unclear. Here we report JWST/MIRI LRS spectroscopy of GHZ8, a UV-bright galaxy at...

R. Lin, Jorge A. Zavala, J. Álvarez-Márquez et al. · 0 citations

Review Sep 2026

Empirical Near-Infrared Spectral Templates from SPHEREx: Disentangling AGN and Host-Galaxy Emission

SPHEREx conducts the first all-sky near-infrared spectral survey over 0.75-5.0 $\mu$m, spanning the transition from host-galaxy starlight to AGN-heated torus emission and enabling spectroscopic identification of active galactic nuclei (AGNs). We develop a data-driven framework combining weighted non-negative matrix fac...

Wen-Ke Ren, Heng-Xiao Guo, Zhen-Ya Zheng et al. · 0 citations