Search Publications
A Spectral Study of the Black Hole Candidate XTE J1752-223 in the High/Soft State with MAXI, Suzaku, and Swift
Yamaoka, Kazutaka; Makishima, Kazuo; Tashiro, Makoto S. +34 more
We report on an X-ray spectral analysis of the black hole candidate XTE J1752-223 in the 2009-2010 outburst, utilizing data obtained with the MAXI/Gas Slit Camera (GSC), the Swift/XRT, and Suzaku, which work complementarily. As already reported by Nakahira et al. (2010, PASJ…
VLBI Astrometry of the Semiregular Variable RX Bootis
Tafoya, Daniel; Kurayama, Tomoharu; Honma, Mareki +10 more
We present distance measurements of the semiregular variable RX Bootis (RX Boo) with its annual parallax. Using the unique dual-beam system of the VLBI Exploration of Radio Astrometry (VERA) telescope, we conducted astrometric observations of a water maser spot accompanying RX Boo, referred to the quasar J1419+2706 separated by 1.°69 from RX Boo. …
Search for X-Ray Emission Associated with the Shapley Supercluster with Suzaku
Kelley, Richard L.; Sato, Kosuke; Ohashi, Takaya +6 more
Suzaku performed observations of 3 regions in and around the Shapley supercluster, a region located between A 3558 and A 3556, at
Estimates of Emission-Region Locations of Fermi Flat-Spectrum Radio Quasars
Zhang, Li; Yan, Dahai; Zeng, Houdun
We have studied the location of emission regions through modeling the quasi-simultaneous multifrequency spectral energy distributions of 21 Fermi flat-spectrum radio quasars (FSRQs) in the frame of a multicomponent one-zone leptonic model. In our calculations, we took the detailed broad line region (BLR) structure into account, and discussed the e…
Multi-Wavelength Photometric and Polarimetric Observations of the Outburst of 3C 454.3 in 2009 December
Fukazawa, Yasushi; Sakon, Itsuki; Sasada, Mahito +11 more
In 2009 December, the bright blazar 3C 454.3 exhibited a strong outburst in the optical, X-ray, and gamma-ray regions. We performed photometric and polarimetric monitoring of this outburst in the optical and near-infrared bands with TRISPEC and HOWPol attached to the Kanata telescope. We also observed this outburst in the infrared band with AKARI,…
X-Ray Groups of Galaxies at 0.5 < z < 1 in zCOSMOS: Increased AGN Activities in High Redshift Groups
Koekemoer, Anton M.; Tresse, Laurence; Contini, Thierry +48 more
We present a photometric and spectroscopic study of galaxies at 0.5 < z < 1 as a function of the environment based on data from the zCOSMOS survey. There is a fair amount of evidence that galaxy properties depend on the mass of groups and clusters, in the sense that quiescent galaxies prefer more massive systems. We base our analysis on a ma…
Search for Diffuse X-Rays from the Bow Shock Region of Runaway Star BD +43 3654 with Suzaku
Tashiro, Makoto S.; Terada, Yukikatsu; Kouzu, Tomomi +4 more
The bow shocks of runaway stars with strong stellar winds of over 2000 km s
Processing of Polycyclic Aromatic Hydrocarbons in Molecular-Loop Regions near the Galactic Center Revealed by AKARI
Oyabu, Shinki; Onaka, Takashi; Yamagishi, Mitsuyoshi +7 more
We present an AKARI mid-infrared diffuse map of an area of about 4° × 3° near the Galactic center in the 9 µm band. The band intensity is mostly attributed to aromatic hydrocarbon infrared emissions of carbonaceous grains at wavelengths of 6.2, 7,7, 8.6, and 11.3 µm. We detected 9 µm emission structures extending from the Galacti…
A Method of Identifying AGNs Based on Emission-Line Excess and the Nature of Low-Luminosity AGNs in the Sloan Digital Sky Survey. I. A New Method
Tanaka, Masayuki
We developed a new technique for identifying active galactic nuclei (AGNs) and studied the nature of low-luminosity AGNs in the Sloan Digital Sky Survey. This is the former part of a series of papers. We develop a new, sensitive method of identifying AGNs in this paper. The emission-line luminosity in a spectrum is the sum of a star-formation comp…
A Suzaku Study of Ejecta Structure and Origin of Hard X-Ray Emission in the Supernova Remnant G 156.2+5.7
Katsuda, Satoru; Petre, Robert; Yamaguchi, Hiroya +3 more
We report on an X-ray study of the evolved Galactic supernova remnant (SNR) G 156.2