Search Publications
Detailed Spectral Study of an Ultra-Luminous Compact X-Ray Source, M81 X-9, in the Disk-Dominated State
Makishima, Kazuo; Tsunoda, Naoko; Kubota, Aya +3 more
We report on the results of detailed spectral studies of an ultra-luminous X-ray source (ULX), M81 X-9 (Holmberg IX X-1), conducted with XMM-Newton on 2001 April 22 and with ASCA on 1999 April 6. On both occasions, the source showed an unabsorbed 0.5-10keV luminosity of ∼2 × 1040erg s-1 (assuming a distance of 3.4Mpc) and a s…
Non-Uniform Temperature Distribution in the Galaxy Clusters 2A 0335+096 and Abell 496 Observed by XMM-Newton
Kunieda, Hideyo; Furuzawa, Akihiro; Tawara, Yuzuru +2 more
We present the XMM-Newton results of the galaxy clusters 2A 0335+096 and A496. From an investigation of 2-dimensional ICM profiles, we obtained new features related to dynamical activities in the ICM. In 2A 0335+096, we found a spiral cool tail around the central cold core, which is trailing from the opposite side of the cold front observed by Cha…
New Corroborative Evidence for the Overdensity of Galaxies around the Radio-Loud Quasar SDSS J0836+0054 at z = 5.8
Nagao, Tohru; Taniguchi, Yoshiaki; Ajiki, Masaru +8 more
Recently, Zheng et al. (2006) found evidence for an overdensity of galaxies around a radio-loud quasar, SDSS J0836+0054, at z = 5.8 (a 5 arcmin² field). We examined our deep optical imaging data (B, V, r', i', z', and NB816) taken with the Suprime-Cam on the Subaru Telescope. The NB816 narrow-band filter (λc = 815 and Δλ = 12nm) is suit…
Overdensity of X-Ray Sources in the Field of Two Nearby Clusters of Galaxies: XMM-Newton View of A 194 and A 1060
Kunieda, Hideyo; Haba, Yoshito; Furuzawa, Akihiro +4 more
Two nearby clusters of galaxies, A194 (z=0.018) and A1060 (z=0.0114), have been analyzed for their X-ray point-source properties with XMM-Newton EPIC-PN data. A multi-band source detection technique was applied to both of the clusters, resulting in 46 sources from the A194 field and 32 sources from the A1060 field, respectively. The cumulative log…
Soft X-Ray Absorption Due to the Photo-Ionized Plasma in the Low-Mass X-Ray Binary EXO 0748-676 Observed with XMM-Newton Observatory
Asai, Kazumi; Dotani, Tadayasu
We analyzed an effect of the photo-ionization on the continuum spectra using the XMM-Newton archive data of the low-mass X-ray binary EXO 0748-676. We found that the ionization degree of the circumstellar plasma, which modifies the soft X-ray spectrum through absorption, changes largely in association with the X-ray bursts and the dips. The burst …
First Results from the XMM-Newton Slew Survey
Altieri, Bruno; Read, Andrew; Saxton, Richard +2 more
We have attempted to analyse all the available data taken by XMM-Newton as it slews between targets. This slew survey, the resultant source catalogue, and the analysis procedures used are described in an accompanying paper. In this letter we present the initial science results from the survey. To date, detailed source searching has been performed …
Apsidal Motion and Photometric Elements of the Eccentric Eclipsing Binary V401 Lacertae
Demircan, Osman; Bulut, Ibrahim
New (UBV) photometric observations of the recently discovered eccentric orbit binary V401 Lacertae were analyzed by using the Wilson-Devinney program. Seven new minimum times were estimated by using new observations. The analysis of the light curves and all available minimum times has revealed that the system is detached, with the orbital eccentri…
Spectroscopic Study on the Atmospheric Parameters of Nearby F--K Dwarfs and Subgiants
Sato, Bun'ei; Kambe, Eiji; Takeda, Yoichi +2 more
Based on a collection of high-dispersion spectra obtained at Okayama Astrophysical Observatory, the atmospheric parameters (Teff, log g, vt, and [Fe/H]) of 160 mid-F through early-K stars were extensively determined by the spectroscopic method using the equivalent widths of Fe I and Fe II lines along with the numerical techni…
Discovery of a Fifth Image of the Large Separation Gravitationally Lensed Quasar SDSS J1004+4112
Castander, Francisco J.; Hennawi, Joseph F.; Hall, Patrick B. +11 more
We report on the discovery of a fifth lensed image in the large separation lensed quasar system SDSS J1004 + 4112. A faint point source located 0.''2 from the center of the brightest galaxy in the lensing cluster was detected in images taken with the Advanced Camera for Surveys (ACS) and the Near Infrared Camera and Multi-Object Spectrometer (NICM…
Panoramic Views of Cluster-Scale Assemblies Explored by Subaru Wide-Field Imaging
Shimasaku, Kazuhiro; Ohashi, Takaya; Kodama, Tadayuki +21 more
We have started PISCES project; a panoramic imaging and spectroscopic survey of distant clusters on Subaru. It exploits the unique wide-field imaging capability of Suprime-Cam, which provides a 34' × 27' field of view corresponding to a physical area of 16 × 13 Mpc2 at z ∼ 1. We plan to target 15 clusters at 0.4 ≲ z ≲ 1.3. We report on …