Search Publications
Do Ultraluminous X-Ray Sources Really Contain Intermediate-Mass Black Holes?
Ebisawa, Ken; Mineshige, Shin; Kawaguchi, Toshihiro +1 more
An open question remains whether Ultraluminous X-ray Sources (ULXs) really contain intermediate-mass black holes (IMBHs). We carefully investigated the XMM-Newton EPIC spectra of four ULXs that were claimed to be strong candidates of IMBHs by several authors. We first tried fitting by the standard spectral model of disk blackbody (DBB) + power-law…
Detailed XMM-Newton Observation of the Cluster of Galaxies Abell 1060
Ishida, Manabu; Hoshino, Akio; Ohashi, Takaya +3 more
We present results from an XMM-Newton observation of the non-cooling flow cluster Abell 1060. The large effective area of XMM-Newton enabled us to investigate the nature of this cluster in unprecedented detail. >From the observed surface brightness distribution, we found that the gravitational mass distribution is well described by the Navarro-…
Chandra and XMM-Newton Observations of a Group of Galaxies, HCG 62
Fukazawa, Yasushi; Ohashi, Takaya; Yamasaki, Noriko Y. +4 more
We present results from Chandra and XMM-Newton observations of a bright group of galaxies, HCG 62. There are two cavities at about 30'' northeast and 20''southwest of the central galaxy in the Chandra image. The energy spectrum shows no significant change in the cavity compared with that in the surrounding region. The radial X-ray profile is descr…
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…
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 …