Fast measurement of total atomic attenuation, total atomic photoelectric and total atomic scattering cross sections in the range 58 ≤ Z ≤ 68 using radioisotope X-ray fluorescence
Özet
We have monitored with the RXTE PCA the variability pattern of the 2-20 keV
flux in four PG quasars (QSOs) from the Laor et al. (1994) sample. Six
observations of each target at regular intervals of 1 day were performed. The
sample comprises objects with extreme values of Balmer line width (and hence
soft X-ray steepness) and spans about one order of magnitude in luminosity. The
most robust result is that the variability amplitude decreases as energy
increases. Several options for a possible ultimate driver of the soft and hard
X-ray variability, such as the influx rate of Comptonizing relativistic
particles, instabilities in the accretion flow or the number of X-ray active
sites, are consistent with our results.
Atıf için künye
Karabulut, A., BUDAK, G., & Ertuǧrul, M. (1999). Fast measurement of total atomic attenuation, total atomic photoelectric and total atomic scattering cross sections in the range 58 ≤ Z ≤ 68 using radioisotope X-ray fluorescence. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 152(2), 202–206. https://doi.org/10.1016/s0168-583x%2899%2900070-1
BibTeX
@article{karabulut1999-62457,
author = {Karabulut, Abdulhalik and BUDAK, Gökhan and Ertuǧrul, Mehmet},
title = {Fast measurement of total atomic attenuation, total atomic photoelectric and total atomic scattering cross sections in the range 58 ≤ Z ≤ 68 using radioisotope X-ray fluorescence},
journal = {NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS},
year = {1999},
volume = {152},
number = {2},
pages = {202--206},
issn = {0168-583X},
doi = {10.1016/s0168-583x(99)00070-1},
url = {https://akademik.atauni.edu.tr/yayinlar/62457-fast-measurement-of-total-atomic-attenuation-total-atomic-photoelectric-and}
}