661 citations · 1.4k across the 11 of their papers we have counts for
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Evolution of grain size distribution in high-redshift dusty quasars: Integrating large amounts of dust and unusual extinction curves
Takaya Nozawa, Ryosuke S. Asano, Hiroyuki Hirashita +1
The discoveries of huge amounts of dust and unusual extinction curves in high-redshift quasars (z > 4) cast challenging issues on the origin and properties of dust in the early uni…
Evolution of the extinction curves in galaxies
Ryosuke S. Asano, Tsutomu T. Takeuchi, Hiroyuki Hirashita +1
We investigate the evolution of extinction curves in galaxies based on our evolution model of grain size distribution. In this model, we considered various processes: dust formatio…
Dense molecular cloud cores as a source of micrometer-sized grains in galaxies
Hiroyuki Hirashita, Ryosuke S. Asano, Takaya Nozawa +2
Coreshine in dense molecular cloud cores (dense cores) is interpreted as evidence for micrometer-sized grains (referred to as very large grains, VLGs). VLGs may have a significant…
Formation History of Polycyclic Aromatic Hydrocarbons in Galaxies
Ji Yeon Seok, Hiroyuki Hirashita, Ryosuke S. Asano
Polycyclic aromatic hydrocarbons (PAHs) are some of the major dust components in the interstellar medium (ISM). We present our evolution models for the abundance of PAHs in the ISM…