Search Publications
Discovery of a keV-X-ray excess in RX J1856.5-3754
Yoneyama, Tomokage; Hayashida, Kiyoshi; Nakajima, Hiroshi +2 more
RX J1856.5-3754 is the brightest and nearest (∼120 pc) source among thermally emitting isolated neutron stars. Its spectra observed with XMM-Newton and Chandra satellites are well-fitted with the two-temperature (kT∞ ∼ 32 and 63 eV) blackbody model. Fitting ten sets of the data from Suzaku XIS 0, XIS 1, XIS 3, and XMM-Newton EPIC-pn wit…
Search for the warm-hot intergalactic medium around A 2744 using Suzaku
Finoguenov, Alexis; Akamatsu, Hiroki; Ota, Naomi +2 more
We present the results from Suzaku satellite observations of the surrounding region of a galaxy cluster, A 2744, at z = 0.3. To search for oxygen emission lines from the warm-hot intergalactic medium (WHIM), we analyzed X-ray spectra from two northeastern regions 2.2-3.3 and 3.3-4.4 Mpc from the center of the cluster, which offers the first test o…
Discovery of H2O megamasers in obscured active galactic nuclei
Terashima, Yuichi; Salak, Dragan; Nakai, Naomasa +9 more
A new method to discover obscured active galactic nuclei (AGNs) by utilizing X-ray and infrared data has recently been developed. We carried out a survey of H2O maser emission toward 10 obscured AGNs with the Nobeyama 45 m telescope. We newly detected the maser emission with a signal-noise-ratio (SNR) of above 4 from two AGNs; NGC 1402 …