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Discovery of A Faint Quasar at z~6 and Implications for Cosmic Reionization
Yongjung Kim, Myungshin Im, Yiseul Jeon +15
Recent studies suggest that faint active galactic nuclei may be responsible for the reionization of the universe. Confirmation of this scenario requires spectroscopic identificatio…
Type IIb Supernova 2013df Entering Into An Interaction Phase: A Link between the Progenitor and the Mass Loss
K. Maeda, T. Hattori, D. Milisavljevic +23
We report the late-time evolution of Type IIb Supernova (SN IIb) 2013df. SN 2013df showed a dramatic change in its spectral features at ~1 year after the explosion. Early on it sho…
Rest-frame Optical Spectra and Black Hole Masses of 3<z<6 Quasars
Hyunsung David Jun, Myungshin Im, Hyung Mok Lee +11
We present the rest-frame optical spectral properties of 155 luminous quasars at 3.3<z<6.4 taken with the AKARI space telescope, including the first detection of H emission line…
The AKARI 2.5-5.0 Micron Spectral Atlas of Type-1 Active Galactic Nuclei: Black Hole Mass Estimator, Line Ratio, and Hot Dust Temperature
Dohyeong Kim, Myungshin Im, Ji Hoon Kim +11
We present 2.5-5.0 m spectra of 83 nearby () and bright (mag) type-1 active galactic nuclei (AGNs) taken with the Infrared Camera (IRC) on board $\it…