منابع مشابه
The complex soft X - ray spectrum of NGC 4151
We present a detailed analysis of the complex soft X-ray spectrum of NGC 4151 measured by the RGS instruments aboard XMM-Newton. The XMM-Newton RGS spectra demonstrate that the soft X-ray emission is extremely rich in X-ray emission lines and radiative recombination continua (RRC), with no clear evidence for any underlying continuum emission. Line emission, and the associated RRC, are clearly d...
متن کاملExploring the complex X - ray spectrum of NGC 4051
Archival XMM-Newton data on the nearby Seyfert galaxy NGC 4051, taken in relatively high and low flux states, offer a unique opportunity to explore the complexity of its X-ray spectrum. We find the hard X-ray band to be significantly affected by reflection from cold matter, which can also explain a non-varying, narrow Fe K fluorescent line. We interpret major differences between the high and lo...
متن کاملDetection of soft gamma - ray emission from the Seyfert IIgalaxy NGC 4507 by the OSSE
We report the rst soft gamma-ray observation by the OSSE experiment onboard the CGRO of the optically selected Seyfert II galaxy, NGC 4507. The source was observed on two separate weeks in 1993 and detected between 50 and 200 keV at a conndence level of 7. There is no evidence of ux variability within or between the two observation periods which sample timescales from days to months. The source...
متن کاملThe complex X - ray spectrum of the low - mass X - ray binary 4 U 1626 − 67
We report on observations of the X-ray pulsar 4U 1626−67 by the LECS instrument on-board BeppoSAX. We confirm the recent ASCA discovery of excess emission near 1 keV (Angelini et al. 1995). The pulse period of 7.66794 ± 0.00004 s indicates that the source continues to spin-down. The phase averaged spectrum iswell fit by an absorbed power-law of photon index0.61±0.02 and ablackbodyof temperature...
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: 2004
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20047045