منابع مشابه
XMM - 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 spectroscopy of high - redshift quasars
XMM-Newton observations of 29 high redshift (z>2) quasars, including seven radio-quiet, 16 radio-loud and six Broad Absorption Line (BAL) objects, are presented; due to the high redshifts, the rest-frame energy bands extend up to ∼ 30–70 keV. Over 2–10 keV, the quasars can be well fitted in each case by a simple power-law, with no strong evidence for iron emission lines. The lack of iron lines ...
متن کاملXMM - 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 کاملThe Reddest Dr3 Sdss/xmm-newton Quasars
We have cross-correlated the SDSS DR3 Schneider et al. (2005) quasar catalog with the XMMNewton archive. Color and redshift selections (g − r ≥ 0.5 and 0.9 < z < 2.1) result in a sample of 17 red, moderate redshift quasars. The redshift selection minimizes possible contamination due to host galaxy emission and Lyα forest absorption. Both optical and X-ray information are required to distinguish...
متن کاملThe XMM - Newton view of NGC 6251
We report on the nuclear X-ray properties of the radio galaxy NGC 6251 observed with XMM-Newton. NGC 6251 is a well-known radio galaxy with intermediate FRI/II radio properties. It is optically classified as a Seyfert 2 and hosts a supermassive black hole with mass ∼ 6 × 10 8 M⊙. The 0.4–10 keV EPIC pn continuum is best fitted by two thermal components (kT ∼ 0.5 and 1.4 keV, respectively), plus...
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: 2005
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20041621