122 citations · 954 across the 47 of their papers we have counts for
12 papers · 1 filter
Can photo-ionization explain the decreasing fraction of X-ray obscured AGN with luminosity?
A. Akylas, I. Georgantopoulos
Chandra and XMM surveys show that the fraction of obscured AGN decreases rapidly with increasing luminosity. Although this is usually explained by assuming that the covering factor…
Chandra and Spitzer observations of CDFS X-ray obscured QSOs
I. Georgantopoulos, A. Georgakakis, A. Akylas
We present Chandra and Spitzer data of the 186, extragalactic, hard 2-10 keV X-ray selected sources, which lie in the central part of the Chandra Deep Field South (CDFS). For the v…
XMM and Chandra measurements of the AGN intrinsic absorption: dependence on luminosity and redshift
A. Akylas, I. Georgantopoulos, A. Georgakakis +2
We combine bright XMM data with the Chandra Deep Field South observations in order to explore the behavior of the intrinsic AGN absorption, as a function of redshift and luminosity…
X-ray number counts of normal galaxies
A. Georgakakis, I. Georgantopoulos, A. Akylas +2
We use the number counts of X-ray selected normal galaxies to explore their evolution by combining the most recent wide-angle shallow and pencil-beam deep samples available. The di…
Fourier Resolved Spectroscopy of the XMM-Newton Observations of MCG -6-30-15
I. E. Papadakis, D. Kazanas, A. Akylas
We study the Frequency Resolved Spectra of the Seyfert galaxy MCG -6-30-15 obtained during two recent XMM-Newton observations. Splitting the Fourier spectra in soft (<2 keV) and ha…
The XMM-Newton/2dF survey VII. Is there any X-ray absorption in optically selected QSOs?
A. Akylas, A. Georgakakis, I. Georgantopoulos
We explore the X-ray properties of optically selected QSOs spectroscopically identified in the course of the 2dF QSO survey (2QZ). Our main goal is to expand to higher redshifts pr…