109 citations · 159 across the 5 of their papers we have counts for
9 papers
The Compton-thick AGN in the CDF-N
I. Georgantopoulos, A. Akylas, A. Georgakakis +1
We present X-ray spectral analysis of the brightest sources (f_{2-10 keV}>10^{-15}$ cgs) in the Chandra Deep Field North. Our sample consists of 222 sources; for the vast majority…
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…