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84 papers
Potential signature of Population III pair-instability supernova ejecta in the BLR gas of the most distant quasar at z = 7.54
Yuzuru Yoshii, Hiroaki Sameshima, Takuji Tsujimoto +3
The search for Population III (Pop III) stars has fascinated and eluded astrophysicists for decades. One promising place for capturing evidence of their presence must be high-redsh…
Reverberation Measurements of the Inner Radii of the Dust Tori in Quasars
Takeo Minezaki, Yuzuru Yoshii, Yukiyasu Kobayashi +8
We present the results of a dust-reverberation survey of quasars at redshifts z<0.6. We found a delayed response of the K-band flux variation after the optical flux variation in 25…
Calibration of AGN Reverberation Distance Measurements
Shintaro Koshida, Yuzuru Yoshii, Yukiyasu Kobayashi +6
In Yoshii et al. (2014), we described a new method for measuring extragalactic distances based on dust reverberation in active galactic nuclei (AGNs), and we validated our new meth…
Reverberation Measurements of the Inner Radius of the Dust Torus in 17 Seyfert Galaxies
S. Koshida, T. Minezaki, Y. Yoshii +8
We present the results of a dust reverberation survey for 17 nearby Seyfert 1 galaxies, which provides the largest homogeneous data collection for the radius of the innermost dust…
A New Method for Measuring Extragalactic Distances
Y. Yoshii, Y. Kobayashi, T. Minezaki +2
We have pioneered a new method for the measurement of extragalactic distances. This method uses the time-lag between variations in the short wavelength and long wavelength light fr…
Diffuse Galactic Light in the Field of the Translucent High Galactic Latitude Cloud MBM32
N. Ienaka, K. Kawara, Y. Matsuoka +4
We have conducted B, g, V, and R-band imaging in a 45x40 arcmin^2 field containing part of the high Galactic latitude translucent cloud MBM32, and correlated the intensity of diffu…