2 papers
astro-ph.SR2014
Determination of the Hubble Constant Using Cepheids
Mohamed Abdel-Sabour, Mohamed Ebrahim Nouh, Issa Ali Issa +5
This paper introduces a statistical treatment to use Cepheid variable stars as distance indicators. The expansion rate of the Universe is also studied here through deriving the val…
astro-ph.HE2011
X-Ray Spectral Study of AGN Sources Content in Some Deep Extragalactic XMM-Newton Fields
M. A. Hassan, B. A. Korany, R. Misra +3
We undertake a spectral study of a sample of bright X-ray sources taken from six XMM-Newton fields at high galactic latitudes, where AGN are the most populous class. These six fiel…