منابع مشابه
XMM - Newton observation of PG 0844 + 349
In a ∼ 20 ksec XMM-Newton observation the X-ray transient radio-quiet quasar PG 0844+349 was found in a historically high state compared to previous X-ray observations. The quasar showed a featureless spectrum with a strong soft excess over the extrapolation of a hard power law. Comptonization models or a broken power law with Γsoft ∼ 2.75, Γhard ∼ 2.25 and a break energy of Ebreak ∼ 1.35 keV r...
متن کاملAn XMM - Newton Observation of Abell 2597
We report on a 120ks XMM-Newton observation of the galaxy cluster Abell 2597. Results from both the European Photon Imaging Camera (EPIC) and the Reflection Grating Spectrometer (RGS) are presented. From EPIC we obtain radial profiles of temperature, density and abundance, and use these to derive cooling time and entropy. We illustrate corrections to these profiles for projection and point spre...
متن کاملXMM - Newton EPIC observations of 21 low - redshift PG quasars
We present an X-ray spectral analysis of 21 low redshift quasars observed with XMM-Newton EPIC. All the sources are Palomar Green quasars with redshifts between 0.05 and 0.4 and have low Galactic absorption along the line-of-sight. A large majority of quasars in the sample (19/21) exhibit a significant soft excess below ∼ 1–1.5 keV, whilst two objects (PG1114+445 and I Zw1) show a deficit of so...
متن کاملXMM - Newton First Observation in the Pleiades
We present the first results from a 40 ks Guaranteed Time XMM-Newton pointing in the Pleiades. We detect almost all early–mid dM members in the field and several very low mass (VLM) stars – including the brown dwarf (BD) candidate Roque 9 – and investigate the variation of X-ray activity levels, hardness ratios and flare frequency with spectral type down to the BD regime.
متن کاملXMM - Newton Observation of the Cluster of Galaxies Abell 1060
We present results from the XMM-Newton observation of the non-cooling flow cluster A 1060. Large effective area of XMM-Newton enables us to investigate the nature of this cluster in unprecedented detail. From the observed surface brightness distribution, we have found that the gravitational mass distribution is well described by the NFW profile but with a central density slope of ∼1.5. We have ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20021608