L. Y. Aaron Yung

The quasi-star model for Little Red Dots: potential and challenges

Fabrizio Gentile, Mauro Giavalisco, Emanuele Daddi, David Elbaz et autres

(Abridged) Little Red Dots (LRDs) are a class of sources discovered by JWST observationally defined by a "V-shaped" rest-frame UV-Optical SED, a compact or unresolved morphology, and for having, frequently, broad hydrogen emission lines. Among various models, those involving a quasi-star interpret …

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Massive Galaxies Form Early and Gray: Stellar Assembly and Dust Attenuation at z > 3.5 from CAPERS

Katherine Chworowsky, Steven L. Finkelstein, Anthony J. Taylor, Alexa M. Morales et autres

The stellar mass assembly of massive galaxies in the first few billion years of cosmic history remains a central challenge in galaxy formation. Galaxies with M⋆ ≳ 10¹⁰M⊙ observed at z ≳ 4 must grow rapidly under conditions of intense gas accretion, …

Using Lyα Transmitted Spectrum to Probe IGM Transmission and Identify Ionized Structures in Cosmic Reionization

Weida Hu, Casey Papovich, Lu Shen, Pablo Arrabal Haro et autres

We present a study of intergalactic medium (IGM) transmission at 4.5 < z < 6.5 using high-signal-to-noise JWST/NIRSpec prism spectroscopy of 143 galaxies at 5

The GlimmIr: Spectroscopic Variability in a z~7 LRD Indicates Rapid Changes in Both the Narrow and Broad Line Regions

Erini Lambrides, Taylor A. Hutchison, Rebecca L. Larson, Pablo Arrabal Haro et autres

The enigmatic population of “Little Red Dots” (LRDs) is at the center of some of the largest debates in extragalactic astronomy today. The source(s) of ionizing emission and the physical scale over which it governs is still largely unknown. We show for …