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The Quiescent Intracluster Medium in the Core of the Perseus Cluster
Hitomi Collaboration, Felix Aharonian, Hiroki Akamatsu +213
Clusters of galaxies are the most massive gravitationally-bound objects in the Universe and are still forming. They are thus important probes of cosmological parameters and a host…
Origin of the Characteristic X-ray Spectral Variations of IRAS 132243809
Hiroki Yamasaki, Misaki Mizumoto, Ken Ebisawa +1
The Narrow-line Seyfert 1 galaxy (NLS1) IRAS 132243809 is known to exhibit significant X-ray spectral variation, a sharp spectral drop at 7 keV, strong soft excess emissi…
Subaru high-z exploration of low-luminosity quasars (SHELLQs). I. Discovery of 15 quasars and bright galaxies at 5.7 < z < 6.9
Yoshiki Matsuoka, Masafusa Onoue, Nobunari Kashikawa +36
We report the discovery of 15 quasars and bright galaxies at 5.7 < z < 6.9. This is the initial result from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) projec…
Near infrared diffuse interstellar bands toward the Cygnus OB2 association
Satoshi Hamano, Naoto Kobayashi, Sohei Kondo +16
We obtained the near-infrared (NIR) high-resolution () spectra of the seven brightest early-type stars in the Cygnus OB2 association for investigating the en…
Origin of the Broad Iron Line Feature and the Soft X-ray Variation in Seyfert Galaxies
Naoki Iso, Ken Ebisawa, Hiroaki Sameshima +4
Many Seyfert galaxies are known to exhibit significant X-ray spectral variations and seemingly broad iron K-emission line features. In this paper, we show that the "variable partia…