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Discovery of Dying Active Galactic Nucleus in Arp 187: Experience of Drastic Luminosity Decline within years
Kohei Ichikawa, Junko Ueda, Hyun-Jin Bae +4
Arp 187 is one of the fading active galactic nuclei (AGN), whose AGN activity is currently decreasing in luminosity. We investigate the observational signatures of AGN in Arp 187,…
BAT AGN Spectroscopic Survey - XI. The Covering Factor of Dust and Gas in Swift/BAT Active Galactic Nuclei
Kohei Ichikawa, Claudio Ricci, Yoshihiro Ueda +10
We quantify the luminosity contribution of active galactic nuclei (AGN) to the 12 m, mid-infrared (MIR; 5-38 m), and the total IR (5-1000 m) emission in the local AGN dete…
X-ray, Optical, and Near-infrared Monitoring of the New X-ray Transient MAXI J1820+070 in the Low/hard State
Megumi Shidatsu, Satoshi Nakahira, Satoshi Yamada +26
We report X-ray, optical, and near-infrared monitoring of the new X-ray transient MAXI J1820070 discovered with MAXI on 2018 March 11. Its X-ray intensity reached Crab…
The 7-year MAXI/GSC X-ray Source Catalog in the High Galactic-Latitude Sky (3MAXI)
Taiki Kawamuro, Yoshihiro Ueda, Megumi Shidatsu +28
We present the third MAXI/GSC catalog in the high Galactic-latitude sky () based on the 7-year data from 2009 August 13 to 2016 July 31, complementary to that in th…
Suzaku Observations of Heavily Obscured (Compton-thick) Active Galactic Nuclei selected by Swift/BAT Hard X-ray Survey
Atsushi Tanimoto, Yoshihiro Ueda, Taiki Kawamuro +3
We present a uniform broadband X-ray (0.5-100.0 keV) spectral analysis of 12 Swift/Burst Alert Telescope (BAT) selected Compton-thick ($\log N_{\mathrm{H}}/\mathrm{cm}^{-2} \geq 24…