Quasar X-Ray Spectra Revisited: Erratum
نویسندگان
چکیده
منابع مشابه
Rosat Soft X-ray Properties of the Large Bright Quasar Survey: Modeling of Stacked X-ray Spectra
We develop and apply a novel method of analysis to study the X-ray spectral properties of 908 QSOs in the Large Bright Quasar Survey (LBQS) that were observed during the soft X-ray ROSAT All-Sky Survey (RASS). Due to the relatively short (600 s) RASS exposure times, only 10% of the QSOs are detected in X-rays, so X-ray spectral model ts for individual QSOs are precluded by poor photon statistic...
متن کاملSTRONG MgII SYSTEMS IN QUASAR AND GAMMA-RAY BURST SPECTRA
The incidence of strong MgII systems in gamma-ray burst (GRB) spectra is a few times higher than in quasar (QSO) spectra. We investigate several possible explanations for this effect, including: dust obscuration bias, clustering of the absorbers, different beam sizes of the sources, multiband magnification bias of GRBs, association of the absorbers with the GRB event or the circumburst environm...
متن کاملThe X-ray problem revisited
In this letter we re-visit the X-ray problem. Assuming point interaction between the conduction electrons and the instantaneously created core-hole, the latter’s Green’s function can be represented as a Fredholm determinant of certain Wiener-Hopf operators acting on L2(0, T ) with discontinuous symbols. Here the symbols are the local conduction electron Green’s function in the frequency domain ...
متن کاملsimulation and comparison of radiology x-ray spectra
monte carlo method is a very accurate method to optimize medical diagnostic radiology spectra and simulation of radiation transportation. using mcnp code, radiology and mammography attenuated x-rayspectraweresimulated.the ipem report number 78 was used as a reference to compare with the geant4 and mcnp simulations because of its popularity and wide availability. the results of geant4 in 40kev s...
متن کاملX-ray spectra calculation for different target-filter of mammograms using MCNP Code
ABSTRACTBackground: An electron beam generated X-ray spectrum consists of characteristic X-ray and continuous bermsstrahlung. The aim of this research is calculating and comparing X-ray spectra for different target filter of mammograms. Materials and Methods: Monte Carlo is a very powerful tool to simulate a series of different target-filter assembly in order to calculate the X-ray spectra. MC...
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: The Astrophysical Journal
سال: 1994
ISSN: 0004-637X,1538-4357
DOI: 10.1086/174541